Merge pull request 'Release: Feature 17 (Shopping List and Supply Archive)' (#142) from release/2026-10-08b into main

Reviewed-on: #142
Reviewed-by: The Reviewer <18+review_agent@code.cubecraftcreations.com>

README.md

@@ -11,61 +11,14 @@ single Go service with the React PWA embedded in the binary.
 > `/health`, embedded PWA skeleton, Makefile, Dockerfile, CI). The planned
 > application is described in [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md).
 
-## Quick start
+## Running it locally
 
-Requirements: Go 1.25 and Node.js `^22.22.2 || ^24.15.0 || >=26.0.0` — that
+The developer setup (prerequisites, Authentik and Google clients, the
-is, 22.22.2 or later on the 22 line, 24.15.0 or later on the 24 line, or 26.0.0
+`MEALQUEST_*` environment, `make dev` and the optional SearXNG sidecar) is
-or later. Node.js 23, 24.0–24.14 and 25 are not supported: this is the
+runbook information and lives in CTXD: project `mealquest`, file
-`engines` range of jsdom in the committed lockfile, the strictest of all the
+`RUNBOOKS.MD`, section "Local development". Configuration is read only from
-web dependencies.
+the environment, and the service refuses to start, naming every missing or
-
+invalid variable.
-```sh
-(cd web && npm ci)
-mkdir -p ~/.mealquest-dev   # outside the repository: it holds a secret
-chmod 700 ~/.mealquest-dev
-head -c 32 /dev/urandom | base64 > ~/.mealquest-dev/secret_key
-chmod 600 ~/.mealquest-dev/secret_key
-export MEALQUEST_HTTP_ADDR=:8080
-export MEALQUEST_PUBLIC_URL=http://localhost:5173
-export MEALQUEST_DATA_DIR="$HOME/.mealquest-dev"
-export MEALQUEST_SHUTDOWN_TIMEOUT=10s
-export MEALQUEST_SECRET_KEY_FILE="$HOME/.mealquest-dev/secret_key"
-# Authentik OAuth2/OpenID provider for MealQuest (redirect URI:
-# $MEALQUEST_PUBLIC_URL/auth/callback). Save its client secret to the file.
-export MEALQUEST_OIDC_ISSUER=https://auth.example.com/application/o/mealquest/
-export MEALQUEST_OIDC_CLIENT_ID=mealquest
-export MEALQUEST_OIDC_CLIENT_SECRET_FILE="$HOME/.mealquest-dev/oidc_client_secret"
-export MEALQUEST_OIDC_ALLOWED_GROUPS=mealquest-admin
-# Optional: sessions end after MEALQUEST_SESSION_IDLE unused (default 720h)
-# and always MEALQUEST_SESSION_MAX after sign-in (default 4320h).
-# export MEALQUEST_SESSION_IDLE=720h
-# export MEALQUEST_SESSION_MAX=4320h
-# Optional: comma-separated IPs/CIDRs of reverse proxies whose
-# X-Forwarded-For/-Proto headers are honoured (production: Traefik). Unset
-# trusts no peer, which is right for local development.
-# export MEALQUEST_TRUSTED_PROXY=10.60.1.33
-# Optional: a SearXNG instance the Settings screen suggests as the recipe
-# search URL until one is saved.
-# export MEALQUEST_SEARXNG_URL=http://localhost:8888
-export MEALQUEST_DEFAULT_TZ=America/New_York
-make dev
-```
-
-`make dev` runs the Go server on `:8080` and the Vite dev server on `:5173`
-(which proxies `/api`, `/auth` and `/media` to `:8080`). Open
-http://localhost:5173. Configuration is environment-only and fails fast:
-every variable above is required except the commented-out session
-lifetimes (when set they must be positive, with MAX at least IDLE),
-trusted proxy list (every entry must be an IP or CIDR), the SearXNG URL
-(an absolute `http://` or `https://` URL without credentials, a query or a
-fragment) and `MEALQUEST_DEFAULT_TZ`, and
-secrets are read only from files named by `*_FILE` variables. `MEALQUEST_PUBLIC_URL`, `MEALQUEST_OIDC_ISSUER` and the
-endpoints the issuer advertises must be `https://`; plain `http://` is
-accepted only for `localhost`, `127.0.0.1` and `[::1]`.
-`MEALQUEST_DEFAULT_TZ` is the IANA zone the household settings are created
-with on first boot: until those settings exist, boot fails unless it is a
-valid IANA zone. Later boots ignore it, set or not (change the zone in
-household settings instead).
 
 ## Common commands
 
@@ -78,7 +31,8 @@ household settings instead).
 
 ## Where to read next
 
-- [AGENTS.md](AGENTS.md) — house rules, approved dependencies, conventions.
+- [AGENTS.md](AGENTS.md) — house rules, approved dependencies, the quality
+  floor every change must pass, repository layout, conventions.
 - [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md) — architecture of record.
 - [design/MealQuest Requirements.md](design/MealQuest%20Requirements.md) — product requirements.
 - [design/MealQuest UI Designs/design_handoff_mealquest/README.md](design/MealQuest%20UI%20Designs/design_handoff_mealquest/README.md) — UI handoff.

cmd/server/main.go

@@ -28,6 +28,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/recipes"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/secretbox"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/server"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/suggest"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/migrations"
@@ -132,6 +133,11 @@ func run(cfg config.Config, logger *slog.Logger) error {
 		return err
 	}
 
+	shopSvc, err := shopping.NewService(db, archiveTitler(ai, guard), runner, logger)
+	if err != nil {
+		return err
+	}
+
 	sessions, err := auth.NewSessionManager(db, cfg.SessionIdle, cfg.SessionMax)
 	if err != nil {
 		return err
@@ -148,7 +154,7 @@ func run(cfg config.Config, logger *slog.Logger) error {
 		return err
 	}
 
-	router, err := server.NewRouter(logger, version, cfg.TrustedProxy, authFlow, sessions, settings, search, ai, dinnerSvc, suggestSvc, planSvc, googleSvc, runner, photos, frontend.Assets())
+	router, err := server.NewRouter(logger, version, cfg.TrustedProxy, authFlow, sessions, settings, search, ai, dinnerSvc, suggestSvc, planSvc, shopSvc, googleSvc, runner, photos, frontend.Assets())
 	if err != nil {
 		return err
 	}
@@ -274,7 +280,7 @@ func newJobRunner(db *store.Store, logger *slog.Logger) (*jobs.Runner, *jobKinds
 // service registers its own kinds when it is built, before the runner
 // starts (dinners.NewService registers dinners.KindGroundDinner and
 // suggest.NewService suggest.KindSuggestionBatch, plan.NewService
-// plan.KindDraftWeek).
+// plan.KindDraftWeek, shopping.NewService shopping.KindTitleSupplyRun).
 func registerJobKinds(runner *jobs.Runner) (*jobKinds, error) {
 	builtins, err := jobs.RegisterBuiltins(runner)
 	if err != nil {
@@ -319,6 +325,18 @@ func weekDrafter(ai *aisettings.Service, guard *harness.Guard) plan.Drafter {
 	}
 }
 
+// archiveTitler runs archive_title with the AI settings current at each
+// run, sharing guard.
+func archiveTitler(ai *aisettings.Service, guard *harness.Guard) shopping.Titler {
+	return func(ctx context.Context, scope string, in skills.ArchiveTitleRequest) (skills.ArchiveTitle, error) {
+		cfg, err := ai.HarnessConfig(ctx, guard)
+		if err != nil {
+			return skills.ArchiveTitle{}, err
+		}
+		return skills.TitleArchive(ctx, cfg, scope, in)
+	}
+}
+
 // logListening logs the startup line. Only the public URL's origin is logged
 // so no credential-bearing URL component can reach the log.
 func logListening(logger *slog.Logger, cfg config.Config) {

deploy/.env.example

@@ -1,20 +1,15 @@
-# MealQuest production environment. Copy to deploy/.env (never committed)
+# MealQuest production environment: the template for deploy/.env (never
-# and replace the placeholders. The service fails fast: a missing or invalid
+# committed). The service fails fast: a missing or invalid required variable
-# required variable stops it at boot with the variable named.
+# stops it at boot with the variable named. Creating deploy/.env: CTXD
+# project mealquest, RUNBOOKS.MD "Stack and first deploy" > "3. Environment
+# file".
 #
 # Secrets are never set here. They live in deploy/secrets/ (never committed),
-# one value per file, owned by the container user and readable only by it:
+# one value per file, owned by the container user 10001:10001 with mode
-#
+# 0600: secret_key, oidc_client_secret and google_client_secret. SearXNG's
-#   mkdir -p deploy/secrets && chmod 700 deploy/secrets
+# searxng.env is the exception: compose reads it itself, so it is owned by
-#   head -c 32 /dev/urandom | base64 > deploy/secrets/secret_key
+# the host account that runs compose, mode 0600. Creating them: CTXD project
-#   printf '%s\n' '<Authentik client secret>' > deploy/secrets/oidc_client_secret
+# mealquest, RUNBOOKS.MD "Stack and first deploy" > "4. Secrets".
-#   printf '%s\n' '<Google OAuth client secret>' > deploy/secrets/google_client_secret
-#   sudo chown 10001:10001 deploy/secrets/* && sudo chmod 600 deploy/secrets/*
-#
-# SearXNG's secret key is the exception: compose reads it itself, so it
-# stays owned by you (mode 0600). Create it after the chown above:
-#
-#   (umask 077; printf 'SEARXNG_SECRET=%s\n' "$(openssl rand -hex 32)" > deploy/secrets/searxng.env)
 #
 # deploy/compose.yaml mounts them at /run/secrets/<name> and points the
 # *_FILE variables at them.
@@ -42,8 +37,7 @@ MEALQUEST_TRUSTED_PROXY=10.60.1.33
 
 # IANA zone the household settings are created with on first boot. Required
 # until those settings exist; ignored afterwards (change the zone in
-# household settings instead). Confirm the household's zone before the first
+# household settings instead).
-# deploy.
 MEALQUEST_DEFAULT_TZ=America/New_York
 
 # --- Authentik OIDC ----------------------------------------------------------
@@ -57,10 +51,10 @@ MEALQUEST_OIDC_ALLOWED_GROUPS=mealquest-admin
 
 # --- Google Calendar (Push to Calendar) ------------------------------------
 
-# Client ID of the Google OAuth web client (deploy/RUNBOOK.md "Google
+# Client ID of the Google OAuth web client (CTXD project mealquest,
-# Calendar OAuth client"). Required: the service will not start without it
+# RUNBOOKS.MD "Google Calendar OAuth client"). Required: the service will
-# and the client secret file. Its authorized redirect URI is
+# not start without it and the client secret file. Its authorized redirect
-# <MEALQUEST_PUBLIC_URL origin>/api/v1/integrations/google/callback.
+# URI is <MEALQUEST_PUBLIC_URL origin>/api/v1/integrations/google/callback.
 MEALQUEST_GOOGLE_CLIENT_ID=<client id>.apps.googleusercontent.com
 
 # Optional session lifetimes. A session ends after IDLE unused and always MAX
@@ -82,13 +76,14 @@ MEALQUEST_SESSION_MAX=4320h
 #   The SearXNG recipe-search sidecar on the compose network. The Settings
 #   screen pre-fills it as the SearXNG URL until one is saved; the saved
 #   provider and base URL come from PATCH /api/v1/settings/recipe-search.
-#   See deploy/RUNBOOK.md "Recipe search (SearXNG)".
+#   See CTXD project mealquest, RUNBOOKS.MD "Recipe search (SearXNG)".
 
 # --- Planned; not read by the service yet -------------------------------------
 #
 # Added to deploy/compose.yaml and this file by the features that use them.
 #
-# Web Push (Feature 19). Generate the key pair with cmd/vapidgen.
+# Web Push (Feature 19). Key pair: CTXD project mealquest, RUNBOOKS.MD
+# "VAPID keys (Web Push)".
 # MEALQUEST_VAPID_PUBLIC_KEY=<base64url VAPID public key>
 # MEALQUEST_VAPID_PRIVATE_KEY_FILE=/run/secrets/vapid_private_key
 # MEALQUEST_VAPID_SUBJECT=mailto:<owner address>

deploy/compose.dev.yaml

@@ -1,8 +1,7 @@
-# Development override: publishes SearXNG on the dev machine's loopback so
+# Development override layered on deploy/compose.yaml: publishes SearXNG
-# it can be queried directly, e.g.
+# on the dev machine's loopback (127.0.0.1:8888) so it can be queried
-#
+# directly. Using it: CTXD project mealquest, RUNBOOKS.MD "Local
-#   docker compose -f deploy/compose.yaml -f deploy/compose.dev.yaml up -d searxng
+# development".
-#   curl 'http://127.0.0.1:8888/search?q=chicken+tikka+masala+recipe&format=json'
 #
 # Loopback only, never a LAN address. Never used in production: the
 # systemd unit starts deploy/compose.yaml alone.

deploy/compose.yaml

@@ -1,18 +1,16 @@
-# Production stack for MealQuest on 10.60.1.14 (D-018). Build on the host,
+# Production stack for MealQuest on 10.60.1.14 (D-018). Building, deploying
-# then start through systemd:
+# and operating it: CTXD project mealquest, RUNBOOKS.MD "Stack unit" and
-#
+# "Routine deploy and rollback".
-#   docker compose -f deploy/compose.yaml build
-#   sudo systemctl restart mealquest
 #
 # The services use restart: "no" on purpose: Docker must not start them
 # before the DOCKER-USER firewall is applied. deploy/systemd/mealquest.service
 # owns start and stop and requires mealquest-firewall.service first.
 #
-# Configuration comes from deploy/.env (copy deploy/.env.example) and secrets
+# Configuration comes from deploy/.env (template: deploy/.env.example) and
-# from deploy/secrets/; neither is committed. Compose bind-mounts file secrets
+# secrets from deploy/secrets/; neither is committed. Compose bind-mounts
-# with their host owner and mode, so each file in deploy/secrets/ must be
+# file secrets with their host owner and mode, so each file in
-# owned by the container user 10001:10001 with mode 0600 (except
+# deploy/secrets/ must be owned by the container user 10001:10001 with mode
-# searxng.env, read by compose itself; see the searxng service).
+# 0600 (except searxng.env, read by compose itself; see the searxng service).
 name: mealquest
 
 services:
@@ -65,8 +63,8 @@ services:
   # the app's own user (owner of the volume) with a read-only root
   # filesystem, no privilege escalation and no Linux capabilities.
   #
-  # Restore: follow "Restore the database" in deploy/RUNBOOK.md (stop the
+  # Restoring the database: CTXD project mealquest, RUNBOOKS.MD "Restore
-  # stack, move the database with its -wal and -shm aside, restore, check).
+  # the database".
   litestream:
     image: litestream/litestream:0.5.17
     user: "10001:10001"

deploy/systemd/mealquest-firewall.service

@@ -5,8 +5,9 @@
 # are one-way: a failure here fails this unit visibly and never fails
 # docker.service.
 #
-# Start MealQuest only after this unit has succeeded:
+# mealquest.service requires this unit and starts the stack only after it
-#   systemctl start mealquest-firewall && docker compose up -d
+# has succeeded. Installing and operating both: CTXD project mealquest,
+# RUNBOOKS.MD "Host firewall" and "Stack unit".
 [Unit]
 Description=Restrict MealQuest port 8090 to Traefik (DOCKER-USER)
 After=docker.service

deploy/systemd/mealquest-media-backup.service

@@ -1,8 +1,7 @@
 # Runs the nightly MealQuest media backup (/usr/local/sbin/mealquest-media-backup).
-# Triggered by mealquest-media-backup.timer; run by hand with
+# Triggered by mealquest-media-backup.timer; output goes to the journal.
-#   systemctl start mealquest-media-backup
+# Installing it and running it by hand: CTXD project mealquest,
-# and read the result with
+# RUNBOOKS.MD "Media — nightly rsync".
-#   journalctl -u mealquest-media-backup
 #
 # The script runs as the app's user (10001, host user "mealquest") with no
 # capabilities. systemd, as root, only bind-mounts the data volume's root

deploy/systemd/mealquest-media-backup.sh

@@ -15,8 +15,9 @@
 # swapping the path afterwards cannot redirect it. Symlinks inside the
 # directory are copied as links (-a), never followed.
 #
-# The media directory is created at deploy time (deploy/RUNBOOK.md). If it
+# The media directory is created at deploy time (CTXD project mealquest,
-# is missing the job fails; it is never treated as "nothing to back up".
+# RUNBOOKS.MD "Media — nightly rsync"). If it is missing the job fails; it
+# is never treated as "nothing to back up".
 #
 # rsync mirrors into .../mealquest-backups/media/ only: the target ends in
 # a slash, so --delete removes files from that directory and nothing

docs/ARCHITECTURE.md

@@ -102,8 +102,8 @@ Columns ending in `_ct` hold AES-256-GCM ciphertext (via `secretbox`).
 | `week_plans` | week_start (unique), status (`draft` / `synced` / `changed`), ai_note, ai_run_id, calendar_synced_at, revision (raised by every swap and stored draft). |
 | `plan_days` | plan_id, date (unique per plan), dinner_id, is_new, calendar_event_id (set while the chosen calendar shows the day as planned; cleared when its dinner changes, another calendar is chosen or Google Calendar is disconnected). |
 | `rotation_reviews` | dinner_id + plan_date (unique), status, decision (`keep` / `drop` / `not_made`), name (set only by a drop: the dinner's name when dropped, kept whatever it is later renamed, so a drop stays among the passed names), decided_at, updated_by. |
-| `shopping_lists` | week_start (unique), plan_id, title, status (`current` / `archived`), sent_to_chat_at, frozen_at. |
+| `shopping_lists` | week_start (unique), plan_id, title (the AI-written post title; NULL until written or when the AI fails, when the week label is shown instead; never empty), status (`current` / `archived`), sent_to_chat_at, frozen_at. |
-| `shopping_groups` / `shopping_items` | One group per dinner/day; item name, qty, needed (bool), position. |
+| `shopping_groups` / `shopping_items` | One group per plan day with ingredients: dinner_id, date, position (by date). Item name, qty (the display quantity, NULL when the recipe gives none), needed (bool), position. Made by `shopping.Generate` from the plan, with no model call: an item is a grounded recipe ingredient's normalized name with qty and unit joined ("2 cups"), or a manual recipe's line as typed with no qty. Regenerating keeps the id and needed flag of an item whose (dinner_id, name) is unchanged. |
 | `ai_settings` | One row: provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at. |
 | `recipe_search_settings` | One row: provider (`searxng` / `brave`), base_url (the SearXNG instance), api_key_ct and api_key_last4 (Brave). |
 | `integrations_google` | One row: refresh_token_ct, calendar_id, calendar_name, connected_at, last_sync_error. |
@@ -470,6 +470,51 @@ automatic** (D-021).
   not a Regular; and one whose reason is over 180 characters or names none
   of its cited Regulars. Cited names are rewritten as the household writes
   them. Grounding each survivor in a recipe is the caller's next step.
+- **Supply run titles** (`skills.TitleArchive`, skill `archive_title`
+  v1): from the names of the week's planned dinners in day order, writes
+  `{title}`, the Supply run's post title in the Supply archive, at the
+  household temperature with no household context. A title must be 1–48
+  characters on one line, with no emoji and no surrounding quotation
+  marks; a reply breaking a rule gets the one repair turn, never a
+  truncation. `shopping.Generate` (and `GeneratePushed`), on storing a
+  list that is still untitled — a new list, or one a failed title left
+  untitled — enqueues a `title_supply_run` job in the generation's
+  transaction and returns without waiting for it, so neither Push to
+  Calendar nor `POST /shopping/{weekStart}/generate` waits for a model
+  call; the list reads untitled until the job stores its title. The job's
+  scope is `<weekStart>@<plan revision>/<sha256 of the dinner names in
+  order>`, so runs share a title only for the same names (a renamed dinner
+  changes the names, not the revision). It writes `shopping_lists.title`
+  only while the list is untitled and not frozen. A title is written once;
+  a remake keeps it and enqueues no job. A failed title never fails the
+  generation: the list stays untitled (the UI shows the week label), the
+  failure is logged as a warning and recorded in `ai_runs`, the job fails
+  `title_failed`, and the week's next generation tries again.
+  `shopping.Freeze` titles a list still untitled once more before
+  freezing it (see Supply archive), through the same skill, scope and
+  conditional write.
+
+## Supply archive (Feature 17)
+
+`shopping.Freeze(weekStart)` moves a week's Supply run into the Supply
+archive: `status` becomes `archived` and `frozen_at` is set, after which
+generating the list or changing an item is 409 `archived`. It freezes only
+a week that has ended in the household's time zone (its Monday is before
+the Monday of the household's current week), so a week not yet ended is
+`ErrWeekNotEnded` and a week with no list `ErrListNotFound`; freezing a
+frozen list does nothing. A list still untitled is titled first with
+`archive_title` from the week's plan, as `Generate` titles it; a title
+that cannot be written is logged and the list is frozen untitled, when its
+week label stands in for good. Titling and freezing are ordered by a
+per-service `RWMutex`: a `title_supply_run` job holds it shared across
+reading the list, the `archive_title` run and the title write, and `Freeze`
+holds it exclusively from reading the list to freezing it. So a freeze
+waits for a job in flight to store its title or fail for good; when the
+job failed, the freeze finds the list still untitled and makes its own
+`archive_title` attempt before freezing. A job that starts during a freeze
+waits for it, then finds the list titled (that title stands) or frozen
+untitled (the job fails `title_failed`), and stores nothing. The
+`week_rollover` schedule is to call `Freeze` for last week.
 
 ## Recipe grounding
 
@@ -738,9 +783,52 @@ Runs are recorded in `schedule_runs` and executed through `jobs`.
     failures), 404 when the week
     has no plan, 400 `invalid_week`. The push holds the account lock
     across its Google requests and its record, like listing and choosing.
-  - The week's Supply run (Feature 17) is made from a pushed plan: a
+  - The week's Supply run (Feature 17) is made from a pushed plan: after
-    successful `Push` returns that plan, which is where Feature 17 hooks
+    a successful `Push`, the handler runs `shopping.GeneratePushed` for
-    in. Nothing here generates a shopping list.
+    the week at the plan revision `Push` pushed, and the 200 answer
+    carries `supply_run: {status, error}`. `status` is `generated`;
+    `archived` when the week's Supply run is in the Supply archive and was
+    left as it was; or `failed` — error `plan_changed` (retryable, logged
+    as a warning) when the plan was edited between the push and
+    generation, so no Supply run is made from a plan Calendar does not
+    show and pushing again makes it; or error `supply_run_failed`
+    (retryable, logged as an error) when it could not be made, and
+    `POST /api/v1/shopping/{weekStart}/generate` makes it again.
+    Generation checks the revision inside its own transaction, and never
+    fails or undoes the push — Calendar already shows the plan.
+
+## Supply run API (Feature 17)
+
+- `GET /api/v1/shopping/{weekStart}` returns `{weekStart, label, title,
+  status, sent_to_chat_at, needed_count, total_count, groups: [{dinner:
+  {id, name}, date, day, items: [{id, name, qty, needed}]}]}`: `label` is
+  the week label (shown while `title` is null), `day` the plan day's
+  weekday ("Monday"), `qty` null when the recipe gives none,
+  `needed_count` the items still needed and `total_count` all items. 404
+  when the week has no Supply run, 400 `invalid_week`.
+- `POST /api/v1/shopping/{weekStart}/generate` makes or remakes the list
+  through `shopping.Generate` and answers with the same shape plus
+  `skipped: [{date, dinner_id, dinner_name, reason}]`. 404 when the week
+  has no plan, 409 `archived` when its list is in the Supply archive.
+- `PATCH /api/v1/shopping/items/{id}` takes `{needed}` (a required
+  boolean; it sets the flag, it does not flip it) and answers `{id,
+  needed, needed_count, total_count}` with the list's counts after the
+  change. 404 for an unknown item, 409 `archived` when the list is in the
+  Supply archive, 400 `invalid_request` for a bad body.
+- `GET /api/v1/shopping/archive?by=week|month|year` returns the Supply
+  archive `{by, periods: [{key, heading, posts: [{weekStart, label,
+  title, dinnerCount, itemCount, onHandCount, dinners, current}]}]}`: the
+  Supply run of every week up to the household's current week, newest
+  first, grouped by the Monday's ISO week (`key` "2026-W41", `heading` the
+  week label), month ("2026-10", "October 2026") or year ("2026"). The
+  Monday is a household-local date, so the week of Monday 28 December
+  is in December. `label` is the week label ("Week 41 · Oct 5 – 11"; the
+  UI sets it in capitals), `title` null while untitled, `dinners` the
+  list's dinners in day order and `dinnerCount` their number,
+  `itemCount` all items, `onHandCount` the items marked "have it", and
+  `current` true for the household's current week. 400 `invalid_request`
+  for any other `by`. A frozen list is read through `GET
+  /api/v1/shopping/{weekStart}` with `status` `archived`.
 
 ## Frontend
 

internal/ai/skills/archive_title.go

@@ -0,0 +1,148 @@
+package skills
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/harness"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+)
+
+// TitleLimit is the most characters a Supply run's title may have.
+const TitleLimit = 48
+
+// ArchiveTitleRequest is what archive_title reads.
+type ArchiveTitleRequest struct {
+	// Dinners are the names of the week's planned dinners in day order,
+	// Monday first. It must hold at least one, none blank.
+	Dinners []string
+}
+
+// ArchiveTitle is archive_title's output.
+type ArchiveTitle struct {
+	// Title is the Supply run's post title in the Supply archive: 1 to
+	// TitleLimit characters on one line, with no emoji and no surrounding
+	// quotation marks.
+	Title string `json:"title"`
+}
+
+// TitleArchive runs archive_title v1 on in and returns the title of the
+// week's Supply run, written from its dinners. A request with no dinners,
+// or a blank one, fails before any LLM call. scope names the week and its
+// dinners (see harness.Run).
+func TitleArchive(ctx context.Context, cfg harness.Config, scope string, in ArchiveTitleRequest) (ArchiveTitle, error) {
+	return harness.Run(ctx, cfg, archiveTitle{}, scope, in)
+}
+
+// archiveTitle is the skill.
+type archiveTitle struct{}
+
+var _ harness.Skill[ArchiveTitleRequest, ArchiveTitle] = archiveTitle{}
+
+func (archiveTitle) Name() string { return "archive_title" }
+
+func (archiveTitle) Version() int { return 1 }
+
+func (archiveTitle) Timeout() time.Duration { return harness.DefaultTimeout }
+
+// archiveTitlePrompt is the template data of archive_title.v1.tmpl.
+type archiveTitlePrompt struct {
+	// Dinners are the week's dinner names in day order, each on one line.
+	Dinners []string
+}
+
+func (archiveTitle) PromptInput(in ArchiveTitleRequest) (harness.PromptInput, error) {
+	if len(in.Dinners) == 0 {
+		return harness.PromptInput{}, errors.New("the week has no dinners to title it from")
+	}
+	var p archiveTitlePrompt
+	for i, name := range in.Dinners {
+		name = oneLine(name)
+		if name == "" {
+			return harness.PromptInput{}, fmt.Errorf("dinner %d has a blank name", i+1)
+		}
+		p.Dinners = append(p.Dinners, name)
+	}
+	return harness.PromptInput{Data: p}, nil
+}
+
+func (archiveTitle) Schema() llm.JSONSchema {
+	return llm.JSONSchema{Name: "archive_title", Schema: json.RawMessage(`{
+		"type": "object",
+		"properties": {
+			"title": {"type": "string"}
+		},
+		"required": ["title"],
+		"additionalProperties": false
+	}`)}
+}
+
+// UnmarshalJSON decodes the output, requiring its field as the schema
+// does.
+func (t *ArchiveTitle) UnmarshalJSON(data []byte) error {
+	if err := requireFields(data, nil, "title"); err != nil {
+		return fmt.Errorf("output %s", err)
+	}
+	type plain ArchiveTitle
+	return json.Unmarshal(data, (*plain)(t))
+}
+
+// quotes are the quotation marks a title may not start or end with.
+const quotes = `"'` + "`" + "“”‘’„‚«»‹›「」『』"
+
+// Validate finds every broken rule of the title as PostProcess will store
+// it, on one line: empty, over TitleLimit characters, holding an emoji, or
+// starting or ending with a quotation mark.
+func (archiveTitle) Validate(out ArchiveTitle) []string {
+	var problems []string
+	title := oneLine(out.Title)
+	switch n := utf8.RuneCountInString(title); {
+	case n == 0:
+		problems = append(problems, fmt.Sprintf("title is empty; give a title of 1 to %d characters", TitleLimit))
+	case n > TitleLimit:
+		problems = append(problems, fmt.Sprintf("title %q has %d characters; shorten it to at most %d", title, n, TitleLimit))
+	}
+	for _, r := range title {
+		if isEmoji(r) {
+			problems = append(problems, fmt.Sprintf("title %q has an emoji (%U); use words only", title, r))
+			break
+		}
+	}
+	if first, _ := utf8.DecodeRuneInString(title); title != "" && strings.ContainsRune(quotes, first) {
+		problems = append(problems, fmt.Sprintf("title %q starts with a quotation mark; give the title without quotation marks around it", title))
+	} else if last, _ := utf8.DecodeLastRuneInString(title); title != "" && strings.ContainsRune(quotes, last) {
+		problems = append(problems, fmt.Sprintf("title %q ends with a quotation mark; give the title without quotation marks around it", title))
+	}
+	return problems
+}
+
+// isEmoji reports whether r is an emoji or a part of one: a pictograph,
+// a symbol from the emoji blocks, a regional indicator, a keycap, a skin
+// tone, an emoji variation selector or the zero-width joiner.
+func isEmoji(r rune) bool {
+	switch {
+	case r >= 0x1F000 && r <= 0x1FAFF: // tiles, cards, enclosed, pictographs, emoticons, transport, supplemental symbols
+		return true
+	case r >= 0x2600 && r <= 0x27BF: // miscellaneous symbols and dingbats
+		return true
+	case r >= 0x2B00 && r <= 0x2BFF: // arrows and stars such as ⭐ and ⬛
+		return true
+	case r >= 0x2300 && r <= 0x23FF: // technical symbols such as ⌚ and ⏰
+		return true
+	case r >= 0xE0020 && r <= 0xE007F: // tag sequences of flags
+		return true
+	case r == 0x200D, r == 0x20E3, r == 0xFE0F: // joiner, keycap, emoji presentation
+		return true
+	}
+	return false
+}
+
+// PostProcess puts the title on one line, collapsing its white space.
+func (archiveTitle) PostProcess(out ArchiveTitle) (ArchiveTitle, error) {
+	return ArchiveTitle{Title: oneLine(out.Title)}, nil
+}

internal/ai/skills/archive_title_test.go

@@ -0,0 +1,170 @@
+package skills
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"slices"
+	"strings"
+	"testing"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/harness"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+)
+
+// titleWeek is a week of seven dinners, Monday first.
+var titleWeek = ArchiveTitleRequest{Dinners: []string{
+	"Beef Chili", "Pot Roast", "Chicken  Fajitas", "Spaghetti Bolognese", "Sheet Pan Salmon", "Pad Thai", "Fish Tacos",
+}}
+
+func titleReply(title string) llm.GenerateResult {
+	return reply(fmt.Sprintf(`{"title":%q}`, title))
+}
+
+// title runs TitleArchive on in with f and checks f was called exactly
+// calls times, each at the household temperature with the archive_title
+// schema.
+func title(t *testing.T, f *llm.Fake, in ArchiveTitleRequest, calls int) (ArchiveTitle, []llm.Request, error) {
+	t.Helper()
+	out, err := TitleArchive(context.Background(), testConfig(t, f), "2026-10-12", in)
+	reqs := f.Requests()
+	if len(reqs) != calls {
+		t.Fatalf("Generate called %d times, want %d", len(reqs), calls)
+	}
+	if g, _, _ := f.Remaining(); g != 0 {
+		t.Fatalf("%d scripted Generate results unused", g)
+	}
+	for i, req := range reqs {
+		if req.Temperature == nil || *req.Temperature != 0.7 {
+			t.Fatalf("request %d temperature = %v, want 0.7", i+1, req.Temperature)
+		}
+		if req.Schema == nil || req.Schema.Name != "archive_title" {
+			t.Fatalf("request %d schema = %v, want archive_title", i+1, req.Schema)
+		}
+	}
+	return out, reqs, err
+}
+
+func TestArchiveTitleValid(t *testing.T) {
+	var f llm.Fake
+	f.QueueGenerate(titleReply("  Slow Simmers\nand Taco Night "))
+	out, reqs, err := title(t, &f, titleWeek, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if out.Title != "Slow Simmers and Taco Night" {
+		t.Fatalf("title = %q", out.Title)
+	}
+	system, user := reqs[0].System, reqs[0].Messages[0].Content
+	golden(t, "archive_title_valid.system.golden", system)
+	golden(t, "archive_title_valid.user.golden", user)
+	want := "Title the week whose dinners are, in day order from Monday:\n" +
+		"- Beef Chili\n- Pot Roast\n- Chicken Fajitas\n- Spaghetti Bolognese\n- Sheet Pan Salmon\n- Pad Thai\n- Fish Tacos"
+	if user != want {
+		t.Errorf("user message = %q, want %q", user, want)
+	}
+	if !strings.Contains(system, "## Output contract") || !strings.Contains(system, `"title"`) {
+		t.Error("system prompt lacks the output contract")
+	}
+}
+
+// titleRepaired checks a first reply is repaired once, quoting it and the
+// problem wanted.
+func titleRepaired(t *testing.T, first, want string) {
+	t.Helper()
+	var f llm.Fake
+	f.QueueGenerate(titleReply(first), titleReply("Chili, Roast and Taco Night"))
+	out, reqs, err := title(t, &f, titleWeek, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if out.Title != "Chili, Roast and Taco Night" {
+		t.Fatalf("title = %q", out.Title)
+	}
+	repair := reqs[1].Messages
+	if len(repair) != 3 || repair[1].Content != fmt.Sprintf(`{"title":%q}`, first) {
+		t.Fatalf("repair turn does not quote the first reply: %+v", repair)
+	}
+	if !strings.Contains(repair[2].Content, want) {
+		t.Fatalf("repair message = %q, want it to contain %q", repair[2].Content, want)
+	}
+}
+
+func TestArchiveTitleTooLongRepaired(t *testing.T) {
+	long := "A Week of Slow Simmers, Sizzling Fajitas and Taco Night" // 55 characters
+	titleRepaired(t, long, fmt.Sprintf("title %q has 55 characters; shorten it to at most 48", long))
+}
+
+func TestArchiveTitleEmojiRepaired(t *testing.T) {
+	titleRepaired(t, "Taco Night 🌮", `title "Taco Night 🌮" has an emoji (U+1F32E); use words only`)
+}
+
+func TestArchiveTitleQuotedRepaired(t *testing.T) {
+	titleRepaired(t, `"Taco Night"`, `title "\"Taco Night\"" starts with a quotation mark; give the title without quotation marks around it`)
+}
+
+func TestArchiveTitleEmojiTwiceFails(t *testing.T) {
+	var f llm.Fake
+	f.QueueGenerate(titleReply("Chili Week 🔥"), titleReply("Chili Week ❤️"))
+	out, _, err := title(t, &f, titleWeek, 2)
+	var bad *harness.BadOutputError
+	if !errors.As(err, &bad) || !errors.Is(err, llm.ErrBadOutput) {
+		t.Fatalf("err = %v, want a BadOutputError", err)
+	}
+	if !slices.Equal(bad.Repair, []string{`title "Chili Week ❤️" has an emoji (U+2764); use words only`}) {
+		t.Fatalf("repair problems = %q", bad.Repair)
+	}
+	if out.Title != "" {
+		t.Fatalf("title = %q, want none", out.Title)
+	}
+}
+
+func TestArchiveTitleRules(t *testing.T) {
+	s := archiveTitle{}
+	for _, tc := range []struct {
+		title string
+		want  []string
+	}{
+		{"Taco Night", nil},
+		{strings.Repeat("a", TitleLimit), nil},
+		{"Crème Brûlée & Co.", nil},
+		{"Fajitas — Then Tacos", nil},
+		{"Mom's Pot Roast Week", nil},
+		{"  Spaced   out  ", nil},
+		{"", []string{"title is empty; give a title of 1 to 48 characters"}},
+		{" \n ", []string{"title is empty; give a title of 1 to 48 characters"}},
+		{strings.Repeat("é", TitleLimit+1), []string{fmt.Sprintf("title %q has 49 characters; shorten it to at most 48", strings.Repeat("é", TitleLimit+1))}},
+		{"Hot ☕ Week", []string{`title "Hot ☕ Week" has an emoji (U+2615); use words only`}},
+		{"Star ⭐ Week", []string{`title "Star ⭐ Week" has an emoji (U+2B50); use words only`}},
+		{"Go 🇮🇹", []string{`title "Go 🇮🇹" has an emoji (U+1F1EE); use words only`}},
+		{"‘Taco Night’", []string{`title "‘Taco Night’" starts with a quotation mark; give the title without quotation marks around it`}},
+		{"Taco Night”", []string{`title "Taco Night”" ends with a quotation mark; give the title without quotation marks around it`}},
+		{"«Pasta» 🍝 " + strings.Repeat("x", 45), []string{
+			fmt.Sprintf("title %q has 55 characters; shorten it to at most 48", "«Pasta» 🍝 "+strings.Repeat("x", 45)),
+			fmt.Sprintf("title %q has an emoji (U+1F35D); use words only", "«Pasta» 🍝 "+strings.Repeat("x", 45)),
+			fmt.Sprintf("title %q starts with a quotation mark; give the title without quotation marks around it", "«Pasta» 🍝 "+strings.Repeat("x", 45)),
+		}},
+	} {
+		if got := s.Validate(ArchiveTitle{Title: tc.title}); !slices.Equal(got, tc.want) {
+			t.Errorf("Validate(%q) =\n%q\nwant\n%q", tc.title, got, tc.want)
+		}
+	}
+}
+
+func TestArchiveTitleBadRequestFailsBeforeCall(t *testing.T) {
+	for name, tc := range map[string]struct {
+		in   ArchiveTitleRequest
+		want string
+	}{
+		"no dinners":   {ArchiveTitleRequest{}, "the week has no dinners to title it from"},
+		"blank dinner": {ArchiveTitleRequest{Dinners: []string{"Pad Thai", " \n"}}, "dinner 2 has a blank name"},
+	} {
+		t.Run(name, func(t *testing.T) {
+			var f llm.Fake
+			_, _, err := title(t, &f, tc.in, 0)
+			if err == nil || !strings.Contains(err.Error(), tc.want) {
+				t.Fatalf("err = %v, want one containing %q", err, tc.want)
+			}
+		})
+	}
+}

internal/ai/skills/prompts/archive_title.v1.tmpl

@@ -0,0 +1,22 @@
+{{/* archive_title titles a week's Supply run for the Supply archive, from the week's dinners. */}}
+{{define "instructions" -}}
+You title the household's Supply run, the week's shopping list, as it is filed in the Supply archive: a blog-style history of the household's weeks of dinners. Write one short, warm, playful post title for the week, drawn from its dinners.
+
+Rules:
+- At most 48 characters, on one line.
+- Words only: no emoji.
+- No quotation marks around the title.
+- Do not name a date or week number; the archive shows those.
+
+Give:
+- title: the title.
+
+One valid reply, for a week of Beef Chili, Pot Roast and Fish Tacos (an example only, not about this household):
+{"title": "Slow Simmers and Taco Night"}
+{{- end}}
+{{define "user" -}}
+Title the week whose dinners are, in day order from Monday:
+{{- range .Dinners}}
+- {{.}}
+{{- end}}
+{{- end}}

internal/ai/skills/prompts/checksums.txt

@@ -5,3 +5,4 @@ echo v1 ab5d7884f5c7a2261c06b0c9353bb9597070c001420bd4cbb6ec6272c093fdce
 normalize_recipe v1 7174e5479fc020f3b2b39953d85411381aea26defb9943145e7864c5b752d7ee
 suggest_side_quests v1 bd54d7bf9aea0980059a346e5f40ff4c866b80ef9bb9f74e7cbd413be0911c8a
 draft_week v1 e637419690d9532bab53cb8ca01b73a079ecfe8e3022522c05188d18e9740f32
+archive_title v1 b4f30562a8614dac09a69d512dc361883b917ee4228a0ce3b4583c7fd3f6101a

internal/ai/skills/testdata/archive_title_valid.system.golden

@@ -0,0 +1,33 @@
+## Instructions
+You title the household's Supply run, the week's shopping list, as it is filed in the Supply archive: a blog-style history of the household's weeks of dinners. Write one short, warm, playful post title for the week, drawn from its dinners.
+
+Rules:
+- At most 48 characters, on one line.
+- Words only: no emoji.
+- No quotation marks around the title.
+- Do not name a date or week number; the archive shows those.
+
+Give:
+- title: the title.
+
+One valid reply, for a week of Beef Chili, Pot Roast and Fish Tacos (an example only, not about this household):
+{"title": "Slow Simmers and Taco Night"}
+
+## Household context
+No household context.
+
+## Output contract
+This contract overrides any earlier instruction about the form of your reply. Reply with one JSON value matching the JSON Schema "archive_title" below, and nothing else: no prose and no Markdown code fences.
+
+{
+  "type": "object",
+  "properties": {
+    "title": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "title"
+  ],
+  "additionalProperties": false
+}

internal/ai/skills/testdata/archive_title_valid.user.golden

@@ -0,0 +1,8 @@
+Title the week whose dinners are, in day order from Monday:
+- Beef Chili
+- Pot Roast
+- Chicken Fajitas
+- Spaghetti Bolognese
+- Sheet Pan Salmon
+- Pad Thai
+- Fish Tacos

internal/db/models.go

@@ -258,6 +258,7 @@ type ShoppingGroup struct {
 	ID        string
 	ListID    string
 	DinnerID  string
+	Date      string
 	Position  int64
 	CreatedAt string
 	UpdatedAt string
@@ -278,7 +279,7 @@ type ShoppingList struct {
 	ID           string
 	WeekStart    string
 	PlanID       string
-	Title        string
+	Title        sql.NullString
 	Status       string
 	SentToChatAt sql.NullString
 	FrozenAt     sql.NullString

internal/db/querier.go

@@ -43,6 +43,11 @@ type Querier interface {
 	CreateRecipeIngredient(ctx context.Context, arg CreateRecipeIngredientParams) error
 	CreateRecipeStep(ctx context.Context, arg CreateRecipeStepParams) error
 	CreateRotationReview(ctx context.Context, arg CreateRotationReviewParams) error
+	CreateShoppingGroup(ctx context.Context, arg CreateShoppingGroupParams) error
+	// A new item is needed until the household marks it "have it".
+	CreateShoppingItem(ctx context.Context, arg CreateShoppingItemParams) error
+	// A new, untitled Supply run: the title is written later, by the AI.
+	CreateShoppingList(ctx context.Context, arg CreateShoppingListParams) error
 	// name is the name the dish is suggested under, kept whatever its dinner is
 	// later renamed.
 	CreateSuggestion(ctx context.Context, arg CreateSuggestionParams) error
@@ -59,6 +64,8 @@ type Querier interface {
 	DeleteIntegrationsGoogle(ctx context.Context) error
 	DeleteRecipeIngredients(ctx context.Context, recipeID string) error
 	DeleteRecipeSteps(ctx context.Context, recipeID string) error
+	DeleteShoppingGroup(ctx context.Context, id string) error
+	DeleteShoppingItem(ctx context.Context, id string) error
 	FailJob(ctx context.Context, arg FailJobParams) (int64, error)
 	// Fails every unarchived dinner still pending whose grounding job for its
 	// current grounding_revision is no longer queued or running: the process
@@ -80,6 +87,9 @@ type Querier interface {
 	// Records a pending or running batch as done or failed; a batch already
 	// finished is left as it is (0 rows).
 	FinishSuggestionBatch(ctx context.Context, arg FinishSuggestionBatchParams) (int64, error)
+	// Freezes list id into the Supply archive at frozen_at, unless it is
+	// frozen already.
+	FreezeShoppingList(ctx context.Context, arg FreezeShoppingListParams) (int64, error)
 	// Returns sql.ErrNoRows until the row exists.
 	GetAISettings(ctx context.Context) (AiSetting, error)
 	// The job of kind queued or running for the week starting week_start,
@@ -113,6 +123,12 @@ type Querier interface {
 	GetRecipeBySourceURL(ctx context.Context, sourceUrl string) (Recipe, error)
 	// Returns sql.ErrNoRows until the row exists.
 	GetRecipeSearchSettings(ctx context.Context) (RecipeSearchSetting, error)
+	// The Supply run holding item id. Returns sql.ErrNoRows when there is no
+	// such item.
+	GetShoppingItemList(ctx context.Context, id string) (GetShoppingItemListRow, error)
+	// The Supply run of the week starting week_start. Returns sql.ErrNoRows
+	// when there is none.
+	GetShoppingList(ctx context.Context, weekStart string) (ShoppingList, error)
 	// A suggestion with its dinner. Returns sql.ErrNoRows for an unknown id.
 	GetSuggestion(ctx context.Context, id string) (GetSuggestionRow, error)
 	// The id of the job that runs batch batch_id.
@@ -164,6 +180,16 @@ type Querier interface {
 	ListRecentPassedNames(ctx context.Context, limit int64) ([]string, error)
 	ListRecipeIngredients(ctx context.Context, recipeID string) ([]RecipeIngredient, error)
 	ListRecipeSteps(ctx context.Context, recipeID string) ([]RecipeStep, error)
+	// The groups of list list_id with their dinner's name, in list order.
+	ListShoppingGroupDinners(ctx context.Context, listID string) ([]ListShoppingGroupDinnersRow, error)
+	// The groups of list list_id, in list order.
+	ListShoppingGroups(ctx context.Context, listID string) ([]ShoppingGroup, error)
+	// The items of list list_id with their group's dinner, in list order: by
+	// group, then by item.
+	ListShoppingItems(ctx context.Context, listID string) ([]ListShoppingItemsRow, error)
+	// The Supply runs of the weeks starting on or before week_start, newest
+	// week first.
+	ListShoppingListsThrough(ctx context.Context, weekStart string) ([]ShoppingList, error)
 	// The ids of the dinners with status quest_log planned on date, on a plan
 	// of any status, that have no Rotation check for date yet.
 	ListTriedCandidates(ctx context.Context, date string) ([]string, error)
@@ -191,6 +217,10 @@ type Querier interface {
 	// becomes synced. A plan edited since (another revision) is left as it is
 	// (0 rows).
 	MarkWeekPlanSynced(ctx context.Context, arg MarkWeekPlanSyncedParams) (int64, error)
+	MoveShoppingGroup(ctx context.Context, arg MoveShoppingGroupParams) error
+	// Places item id in group group_id at position with quantity qty; its
+	// name and needed flag are kept.
+	MoveShoppingItem(ctx context.Context, arg MoveShoppingItemParams) error
 	// Moves a dinner still suggested to status (quest_log or archived),
 	// recording updated_by; a dinner no longer suggested is left as it is
 	// (0 rows).
@@ -208,6 +238,8 @@ type Querier interface {
 	// Records a new draft over plan id: its status and note, raising its
 	// revision.
 	RedraftWeekPlan(ctx context.Context, arg RedraftWeekPlanParams) error
+	// Records a generation of list id from plan plan_id.
+	RegenerateShoppingList(ctx context.Context, arg RegenerateShoppingListParams) error
 	// An unknown id returns sql.ErrNoRows.
 	SetDinnerFavorite(ctx context.Context, arg SetDinnerFavoriteParams) (Dinner, error)
 	// Sets the chosen calendar; affects no row when nothing is connected.
@@ -215,6 +247,11 @@ type Querier interface {
 	// Records that the event calendar_event_id on Calendar shows date of
 	// plan_id as planned.
 	SetPlanDayCalendarEvent(ctx context.Context, arg SetPlanDayCalendarEventParams) (int64, error)
+	// Marks item id needed (1) or "have it" (0).
+	SetShoppingItemNeeded(ctx context.Context, arg SetShoppingItemNeededParams) error
+	// Titles list id, unless it has a title already or is frozen into the
+	// Supply archive.
+	SetShoppingListTitle(ctx context.Context, arg SetShoppingListTitleParams) (int64, error)
 	// Marks a pending batch running; a batch in any other status is left as
 	// it is (0 rows).
 	StartSuggestionBatch(ctx context.Context, arg StartSuggestionBatchParams) (int64, error)

internal/db/shopping.sql.go

@@ -0,0 +1,465 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.31.1
+// source: shopping.sql
+
+package db
+
+import (
+	"context"
+	"database/sql"
+)
+
+const createShoppingGroup = `-- name: CreateShoppingGroup :exec
+INSERT INTO shopping_groups (id, list_id, dinner_id, date, position, created_at, updated_at)
+VALUES (?, ?, ?, ?, ?, ?, ?)
+`
+
+type CreateShoppingGroupParams struct {
+	ID        string
+	ListID    string
+	DinnerID  string
+	Date      string
+	Position  int64
+	CreatedAt string
+	UpdatedAt string
+}
+
+func (q *Queries) CreateShoppingGroup(ctx context.Context, arg CreateShoppingGroupParams) error {
+	_, err := q.db.ExecContext(ctx, createShoppingGroup,
+		arg.ID,
+		arg.ListID,
+		arg.DinnerID,
+		arg.Date,
+		arg.Position,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+	)
+	return err
+}
+
+const createShoppingItem = `-- name: CreateShoppingItem :exec
+INSERT INTO shopping_items (id, group_id, name, qty, needed, position, created_at, updated_at)
+VALUES (?, ?, ?, ?, 1, ?, ?, ?)
+`
+
+type CreateShoppingItemParams struct {
+	ID        string
+	GroupID   string
+	Name      string
+	Qty       sql.NullString
+	Position  int64
+	CreatedAt string
+	UpdatedAt string
+}
+
+// A new item is needed until the household marks it "have it".
+func (q *Queries) CreateShoppingItem(ctx context.Context, arg CreateShoppingItemParams) error {
+	_, err := q.db.ExecContext(ctx, createShoppingItem,
+		arg.ID,
+		arg.GroupID,
+		arg.Name,
+		arg.Qty,
+		arg.Position,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+	)
+	return err
+}
+
+const createShoppingList = `-- name: CreateShoppingList :exec
+INSERT INTO shopping_lists (id, week_start, plan_id, status, created_at, updated_at)
+VALUES (?, ?, ?, 'current', ?, ?)
+`
+
+type CreateShoppingListParams struct {
+	ID        string
+	WeekStart string
+	PlanID    string
+	CreatedAt string
+	UpdatedAt string
+}
+
+// A new, untitled Supply run: the title is written later, by the AI.
+func (q *Queries) CreateShoppingList(ctx context.Context, arg CreateShoppingListParams) error {
+	_, err := q.db.ExecContext(ctx, createShoppingList,
+		arg.ID,
+		arg.WeekStart,
+		arg.PlanID,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+	)
+	return err
+}
+
+const deleteShoppingGroup = `-- name: DeleteShoppingGroup :exec
+DELETE FROM shopping_groups
+WHERE id = ?
+`
+
+func (q *Queries) DeleteShoppingGroup(ctx context.Context, id string) error {
+	_, err := q.db.ExecContext(ctx, deleteShoppingGroup, id)
+	return err
+}
+
+const deleteShoppingItem = `-- name: DeleteShoppingItem :exec
+DELETE FROM shopping_items
+WHERE id = ?
+`
+
+func (q *Queries) DeleteShoppingItem(ctx context.Context, id string) error {
+	_, err := q.db.ExecContext(ctx, deleteShoppingItem, id)
+	return err
+}
+
+const freezeShoppingList = `-- name: FreezeShoppingList :execrows
+UPDATE shopping_lists
+SET status = 'archived', frozen_at = ?, updated_at = ?
+WHERE id = ? AND frozen_at IS NULL
+`
+
+type FreezeShoppingListParams struct {
+	FrozenAt  sql.NullString
+	UpdatedAt string
+	ID        string
+}
+
+// Freezes list id into the Supply archive at frozen_at, unless it is
+// frozen already.
+func (q *Queries) FreezeShoppingList(ctx context.Context, arg FreezeShoppingListParams) (int64, error) {
+	result, err := q.db.ExecContext(ctx, freezeShoppingList, arg.FrozenAt, arg.UpdatedAt, arg.ID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+const getShoppingItemList = `-- name: GetShoppingItemList :one
+SELECT shopping_lists.id, shopping_lists.week_start, shopping_lists.plan_id, shopping_lists.title, shopping_lists.status, shopping_lists.sent_to_chat_at, shopping_lists.frozen_at, shopping_lists.created_at, shopping_lists.updated_at
+FROM shopping_items
+JOIN shopping_groups ON shopping_groups.id = shopping_items.group_id
+JOIN shopping_lists ON shopping_lists.id = shopping_groups.list_id
+WHERE shopping_items.id = ?
+`
+
+type GetShoppingItemListRow struct {
+	ShoppingList ShoppingList
+}
+
+// The Supply run holding item id. Returns sql.ErrNoRows when there is no
+// such item.
+func (q *Queries) GetShoppingItemList(ctx context.Context, id string) (GetShoppingItemListRow, error) {
+	row := q.db.QueryRowContext(ctx, getShoppingItemList, id)
+	var i GetShoppingItemListRow
+	err := row.Scan(
+		&i.ShoppingList.ID,
+		&i.ShoppingList.WeekStart,
+		&i.ShoppingList.PlanID,
+		&i.ShoppingList.Title,
+		&i.ShoppingList.Status,
+		&i.ShoppingList.SentToChatAt,
+		&i.ShoppingList.FrozenAt,
+		&i.ShoppingList.CreatedAt,
+		&i.ShoppingList.UpdatedAt,
+	)
+	return i, err
+}
+
+const getShoppingList = `-- name: GetShoppingList :one
+SELECT id, week_start, plan_id, title, status, sent_to_chat_at, frozen_at, created_at, updated_at FROM shopping_lists
+WHERE week_start = ?
+`
+
+// The Supply run of the week starting week_start. Returns sql.ErrNoRows
+// when there is none.
+func (q *Queries) GetShoppingList(ctx context.Context, weekStart string) (ShoppingList, error) {
+	row := q.db.QueryRowContext(ctx, getShoppingList, weekStart)
+	var i ShoppingList
+	err := row.Scan(
+		&i.ID,
+		&i.WeekStart,
+		&i.PlanID,
+		&i.Title,
+		&i.Status,
+		&i.SentToChatAt,
+		&i.FrozenAt,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}
+
+const listShoppingGroupDinners = `-- name: ListShoppingGroupDinners :many
+SELECT shopping_groups.id, shopping_groups.list_id, shopping_groups.dinner_id, shopping_groups.date, shopping_groups.position, shopping_groups.created_at, shopping_groups.updated_at, dinners.name AS dinner_name
+FROM shopping_groups
+JOIN dinners ON dinners.id = shopping_groups.dinner_id
+WHERE shopping_groups.list_id = ?
+ORDER BY shopping_groups.position, shopping_groups.id
+`
+
+type ListShoppingGroupDinnersRow struct {
+	ShoppingGroup ShoppingGroup
+	DinnerName    string
+}
+
+// The groups of list list_id with their dinner's name, in list order.
+func (q *Queries) ListShoppingGroupDinners(ctx context.Context, listID string) ([]ListShoppingGroupDinnersRow, error) {
+	rows, err := q.db.QueryContext(ctx, listShoppingGroupDinners, listID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ListShoppingGroupDinnersRow
+	for rows.Next() {
+		var i ListShoppingGroupDinnersRow
+		if err := rows.Scan(
+			&i.ShoppingGroup.ID,
+			&i.ShoppingGroup.ListID,
+			&i.ShoppingGroup.DinnerID,
+			&i.ShoppingGroup.Date,
+			&i.ShoppingGroup.Position,
+			&i.ShoppingGroup.CreatedAt,
+			&i.ShoppingGroup.UpdatedAt,
+			&i.DinnerName,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const listShoppingGroups = `-- name: ListShoppingGroups :many
+SELECT id, list_id, dinner_id, date, position, created_at, updated_at FROM shopping_groups
+WHERE list_id = ?
+ORDER BY position, id
+`
+
+// The groups of list list_id, in list order.
+func (q *Queries) ListShoppingGroups(ctx context.Context, listID string) ([]ShoppingGroup, error) {
+	rows, err := q.db.QueryContext(ctx, listShoppingGroups, listID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ShoppingGroup
+	for rows.Next() {
+		var i ShoppingGroup
+		if err := rows.Scan(
+			&i.ID,
+			&i.ListID,
+			&i.DinnerID,
+			&i.Date,
+			&i.Position,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const listShoppingItems = `-- name: ListShoppingItems :many
+SELECT shopping_items.id, shopping_items.group_id, shopping_items.name, shopping_items.qty, shopping_items.needed, shopping_items.position, shopping_items.created_at, shopping_items.updated_at, shopping_groups.dinner_id
+FROM shopping_items
+JOIN shopping_groups ON shopping_groups.id = shopping_items.group_id
+WHERE shopping_groups.list_id = ?
+ORDER BY shopping_groups.position, shopping_items.position, shopping_items.id
+`
+
+type ListShoppingItemsRow struct {
+	ShoppingItem ShoppingItem
+	DinnerID     string
+}
+
+// The items of list list_id with their group's dinner, in list order: by
+// group, then by item.
+func (q *Queries) ListShoppingItems(ctx context.Context, listID string) ([]ListShoppingItemsRow, error) {
+	rows, err := q.db.QueryContext(ctx, listShoppingItems, listID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ListShoppingItemsRow
+	for rows.Next() {
+		var i ListShoppingItemsRow
+		if err := rows.Scan(
+			&i.ShoppingItem.ID,
+			&i.ShoppingItem.GroupID,
+			&i.ShoppingItem.Name,
+			&i.ShoppingItem.Qty,
+			&i.ShoppingItem.Needed,
+			&i.ShoppingItem.Position,
+			&i.ShoppingItem.CreatedAt,
+			&i.ShoppingItem.UpdatedAt,
+			&i.DinnerID,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const listShoppingListsThrough = `-- name: ListShoppingListsThrough :many
+SELECT id, week_start, plan_id, title, status, sent_to_chat_at, frozen_at, created_at, updated_at FROM shopping_lists
+WHERE week_start <= ?
+ORDER BY week_start DESC
+`
+
+// The Supply runs of the weeks starting on or before week_start, newest
+// week first.
+func (q *Queries) ListShoppingListsThrough(ctx context.Context, weekStart string) ([]ShoppingList, error) {
+	rows, err := q.db.QueryContext(ctx, listShoppingListsThrough, weekStart)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ShoppingList
+	for rows.Next() {
+		var i ShoppingList
+		if err := rows.Scan(
+			&i.ID,
+			&i.WeekStart,
+			&i.PlanID,
+			&i.Title,
+			&i.Status,
+			&i.SentToChatAt,
+			&i.FrozenAt,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const moveShoppingGroup = `-- name: MoveShoppingGroup :exec
+UPDATE shopping_groups
+SET position = ?, updated_at = ?
+WHERE id = ?
+`
+
+type MoveShoppingGroupParams struct {
+	Position  int64
+	UpdatedAt string
+	ID        string
+}
+
+func (q *Queries) MoveShoppingGroup(ctx context.Context, arg MoveShoppingGroupParams) error {
+	_, err := q.db.ExecContext(ctx, moveShoppingGroup, arg.Position, arg.UpdatedAt, arg.ID)
+	return err
+}
+
+const moveShoppingItem = `-- name: MoveShoppingItem :exec
+UPDATE shopping_items
+SET group_id = ?, qty = ?, position = ?, updated_at = ?
+WHERE id = ?
+`
+
+type MoveShoppingItemParams struct {
+	GroupID   string
+	Qty       sql.NullString
+	Position  int64
+	UpdatedAt string
+	ID        string
+}
+
+// Places item id in group group_id at position with quantity qty; its
+// name and needed flag are kept.
+func (q *Queries) MoveShoppingItem(ctx context.Context, arg MoveShoppingItemParams) error {
+	_, err := q.db.ExecContext(ctx, moveShoppingItem,
+		arg.GroupID,
+		arg.Qty,
+		arg.Position,
+		arg.UpdatedAt,
+		arg.ID,
+	)
+	return err
+}
+
+const regenerateShoppingList = `-- name: RegenerateShoppingList :exec
+UPDATE shopping_lists
+SET plan_id = ?, updated_at = ?
+WHERE id = ?
+`
+
+type RegenerateShoppingListParams struct {
+	PlanID    string
+	UpdatedAt string
+	ID        string
+}
+
+// Records a generation of list id from plan plan_id.
+func (q *Queries) RegenerateShoppingList(ctx context.Context, arg RegenerateShoppingListParams) error {
+	_, err := q.db.ExecContext(ctx, regenerateShoppingList, arg.PlanID, arg.UpdatedAt, arg.ID)
+	return err
+}
+
+const setShoppingItemNeeded = `-- name: SetShoppingItemNeeded :exec
+UPDATE shopping_items
+SET needed = ?, updated_at = ?
+WHERE id = ?
+`
+
+type SetShoppingItemNeededParams struct {
+	Needed    int64
+	UpdatedAt string
+	ID        string
+}
+
+// Marks item id needed (1) or "have it" (0).
+func (q *Queries) SetShoppingItemNeeded(ctx context.Context, arg SetShoppingItemNeededParams) error {
+	_, err := q.db.ExecContext(ctx, setShoppingItemNeeded, arg.Needed, arg.UpdatedAt, arg.ID)
+	return err
+}
+
+const setShoppingListTitle = `-- name: SetShoppingListTitle :execrows
+UPDATE shopping_lists
+SET title = ?, updated_at = ?
+WHERE id = ? AND title IS NULL AND status = 'current' AND frozen_at IS NULL
+`
+
+type SetShoppingListTitleParams struct {
+	Title     sql.NullString
+	UpdatedAt string
+	ID        string
+}
+
+// Titles list id, unless it has a title already or is frozen into the
+// Supply archive.
+func (q *Queries) SetShoppingListTitle(ctx context.Context, arg SetShoppingListTitleParams) (int64, error) {
+	result, err := q.db.ExecContext(ctx, setShoppingListTitle, arg.Title, arg.UpdatedAt, arg.ID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}

internal/dinners/grounding.go

@@ -68,6 +68,13 @@ const (
 	manualSourcePrefix = "mealquest:manual:"
 )
 
+// IsManualRecipe reports whether sourceURL, a recipes.source_url, is that
+// of a recipe entered by hand. Its ingredients are stored as typed, in
+// raw_text only: no model normalizes them, so name, qty and unit are NULL.
+func IsManualRecipe(sourceURL string) bool {
+	return strings.HasPrefix(sourceURL, manualSourcePrefix)
+}
+
 // GroundTimeout bounds grounding a candidate or link by hand, which runs in
 // the request: the page fetch (recipes.Timeout), its photo download and
 // normalize_recipe (harness.DefaultTimeout), with some slack.

internal/plan/push.go

@@ -84,20 +84,20 @@ type pushDay struct {
 //
 // A successful Push is the household confirming the week's plan, which is
 // what the week's Supply run (Feature 17) is made from; the returned plan
-// is the one pushed.
+// is the one pushed, and revision is its revision as pushed, so the Supply
-func (s *Service) Push(ctx context.Context, weekStart store.LocalDate) (Plan, error) {
+// run can be made from that plan and no later edit of it.
+func (s *Service) Push(ctx context.Context, weekStart store.LocalDate) (p Plan, revision int64, err error) {
 	if _, err := household.WeekDays(weekStart); err != nil {
-		return Plan{}, &InvalidWeekError{Value: weekStart.String()}
+		return Plan{}, 0, &InvalidWeekError{Value: weekStart.String()}
 	}
 	planID, revision, days, err := s.pushDays(ctx, weekStart)
 	if err != nil {
-		return Plan{}, err
+		return Plan{}, 0, err
 	}
 	events := make([]gcal.Event, len(days))
 	for i, d := range days {
 		events[i] = d.event
 	}
-	var p Plan
 	record := func() error {
 		return s.st.WithTx(ctx, func(tx *sql.Tx) error {
 			q := db.New(tx)
@@ -133,9 +133,9 @@ func (s *Service) Push(ctx context.Context, weekStart store.LocalDate) (Plan, er
 		})
 	}
 	if err := s.cal.PushEvents(ctx, events, record); err != nil {
-		return Plan{}, fmt.Errorf("plan: push %s to Calendar: %w", weekStart, err)
+		return Plan{}, 0, fmt.Errorf("plan: push %s to Calendar: %w", weekStart, err)
 	}
-	return p, nil
+	return p, revision, nil
 }
 
 // pushDays reads, in one read transaction, the plan of the week starting

internal/plan/push_test.go

@@ -135,7 +135,7 @@ func TestPushCreatesOneEventPerDay(t *testing.T) {
 	e.connectCalendar(t)
 	dates := e.storePlan(t, week, fullWeek...)
 
-	p, err := e.svc.Push(t.Context(), week)
+	p, _, err := e.svc.Push(t.Context(), week)
 	if err != nil {
 		t.Fatalf("Push: %v", err)
 	}
@@ -197,7 +197,7 @@ func TestPushAgainUpdatesOnly(t *testing.T) {
 	e := newEnv(t)
 	e.connectCalendar(t)
 	e.storePlan(t, week, fullWeek...)
-	if _, err := e.svc.Push(t.Context(), week); err != nil {
+	if _, _, err := e.svc.Push(t.Context(), week); err != nil {
 		t.Fatal(err)
 	}
 	// The household deletes Monday's event in Google Calendar; Google keeps
@@ -206,7 +206,7 @@ func TestPushAgainUpdatesOnly(t *testing.T) {
 	e.google.CancelEvent(dinnersCal.ID, monday)
 	e.google.ResetEventWrites()
 
-	p, err := e.svc.Push(t.Context(), week)
+	p, _, err := e.svc.Push(t.Context(), week)
 	if err != nil {
 		t.Fatalf("second Push: %v", err)
 	}
@@ -229,7 +229,7 @@ func TestSwapThenPushUpdatesThatDay(t *testing.T) {
 	e := newEnv(t)
 	e.connectCalendar(t)
 	e.storePlan(t, week, fullWeek...)
-	if _, err := e.svc.Push(t.Context(), week); err != nil {
+	if _, _, err := e.svc.Push(t.Context(), week); err != nil {
 		t.Fatal(err)
 	}
 	before := e.google.Events(dinnersCal.ID)
@@ -247,7 +247,7 @@ func TestSwapThenPushUpdatesThatDay(t *testing.T) {
 		t.Errorf("swapped day kept event id %q", id)
 	}
 
-	p, err := e.svc.Push(t.Context(), week)
+	p, _, err := e.svc.Push(t.Context(), week)
 	if err != nil {
 		t.Fatalf("Push: %v", err)
 	}
@@ -296,7 +296,7 @@ func TestPushAcrossDaylightSavingTime(t *testing.T) {
 			e := newEnv(t)
 			e.connectCalendar(t)
 			dates := e.storePlan(t, tc.week, fullWeek...)
-			if _, err := e.svc.Push(t.Context(), tc.week); err != nil {
+			if _, _, err := e.svc.Push(t.Context(), tc.week); err != nil {
 				t.Fatalf("Push: %v", err)
 			}
 			events := e.google.Events(dinnersCal.ID)
@@ -330,12 +330,12 @@ func TestPushAcrossDaylightSavingTime(t *testing.T) {
 func TestPushNeedsAChosenCalendar(t *testing.T) {
 	e := newEnv(t)
 	e.storePlan(t, week, fullWeek...)
-	if _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrNotConnected) {
+	if _, _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrNotConnected) {
 		t.Errorf("Push with nothing connected = %v, want ErrNotConnected", err)
 	}
 	e.google.SetCalendars(0, dinnersCal)
 	e.google.Connect(t, e.gcal)
-	if _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrNoCalendar) {
+	if _, _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrNoCalendar) {
 		t.Errorf("Push with no calendar chosen = %v, want ErrNoCalendar", err)
 	}
 	if inserts, updates := e.google.EventWrites(); inserts+updates != 0 {
@@ -348,7 +348,7 @@ func TestPushWithoutAPlan(t *testing.T) {
 	e := newEnv(t)
 	e.connectCalendar(t)
 	before := e.google.TokenCalls()
-	if _, err := e.svc.Push(t.Context(), week); !errors.Is(err, plan.ErrNotFound) {
+	if _, _, err := e.svc.Push(t.Context(), week); !errors.Is(err, plan.ErrNotFound) {
 		t.Errorf("Push = %v, want ErrNotFound", err)
 	}
 	if n := e.google.TokenCalls() - before; n != 0 {
@@ -363,7 +363,7 @@ func TestPushPartialFailureLeavesPlanUnsynced(t *testing.T) {
 	// Google fails the fourth event on every try.
 	e.google.FailEventWrites(4, 3, http.StatusServiceUnavailable)
 
-	_, err := e.svc.Push(t.Context(), week)
+	_, _, err := e.svc.Push(t.Context(), week)
 	var calendar *gcal.CalendarError
 	if !errors.As(err, &calendar) || !calendar.Retryable() {
 		t.Fatalf("Push = %v, want a retryable *gcal.CalendarError", err)
@@ -377,7 +377,7 @@ func TestPushPartialFailureLeavesPlanUnsynced(t *testing.T) {
 	// Pushing again writes every day: the three already there are updated,
 	// not added twice.
 	e.google.ResetEventWrites()
-	p, err := e.svc.Push(t.Context(), week)
+	p, _, err := e.svc.Push(t.Context(), week)
 	if err != nil {
 		t.Fatalf("retried Push: %v", err)
 	}
@@ -393,7 +393,7 @@ func TestPushPartialFailureKeepsAChangedPlanChanged(t *testing.T) {
 	e := newEnv(t)
 	e.connectCalendar(t)
 	e.storePlan(t, week, fullWeek...)
-	first, err := e.svc.Push(t.Context(), week)
+	first, _, err := e.svc.Push(t.Context(), week)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -403,7 +403,7 @@ func TestPushPartialFailureKeepsAChangedPlanChanged(t *testing.T) {
 		}
 	}
 	e.google.FailEventWrite(2, http.StatusBadRequest)
-	if _, err := e.svc.Push(t.Context(), week); err == nil {
+	if _, _, err := e.svc.Push(t.Context(), week); err == nil {
 		t.Fatal("Push succeeded, want the second event to fail")
 	}
 	p, err := e.svc.Get(t.Context(), week)
@@ -431,7 +431,7 @@ func TestPushToStaleCalendar(t *testing.T) {
 			e.connectCalendar(t)
 			e.storePlan(t, week, fullWeek...)
 			edit(e.google)
-			if _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrCalendarUnavailable) {
+			if _, _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrCalendarUnavailable) {
 				t.Errorf("Push = %v, want ErrCalendarUnavailable", err)
 			}
 			e.assertUnsynced(t, week, plan.StatusDraft)
@@ -444,7 +444,7 @@ func TestPushGrantNoLongerAccepted(t *testing.T) {
 	e.connectCalendar(t)
 	e.storePlan(t, week, fullWeek...)
 	e.google.RevokeGrant()
-	_, err := e.svc.Push(t.Context(), week)
+	_, _, err := e.svc.Push(t.Context(), week)
 	if !errors.Is(err, gcal.ErrReconnect) {
 		t.Fatalf("Push = %v, want ErrReconnect", err)
 	}
@@ -479,12 +479,12 @@ func TestRefusedGrantKeepsPushedWeeks(t *testing.T) {
 	dates := map[store.LocalDate][]string{}
 	for _, w := range pushedWeeks {
 		dates[w] = e.storePlan(t, w, fullWeek...)
-		if _, err := e.svc.Push(t.Context(), w); err != nil {
+		if _, _, err := e.svc.Push(t.Context(), w); err != nil {
 			t.Fatalf("Push %s: %v", w, err)
 		}
 	}
 	e.google.RevokeGrant()
-	if _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrReconnect) {
+	if _, _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrReconnect) {
 		t.Fatalf("Push = %v, want ErrReconnect", err)
 	}
 	e.assertRefused(t)
@@ -497,7 +497,7 @@ func TestRefusedGrantKeepsPushedWeeks(t *testing.T) {
 
 	// The refused token is not offered to Google again.
 	before := e.google.TokenCalls()
-	if _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrReconnect) {
+	if _, _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrReconnect) {
 		t.Fatalf("Push again = %v, want ErrReconnect", err)
 	}
 	if n := e.google.TokenCalls() - before; n != 0 {
@@ -506,7 +506,7 @@ func TestRefusedGrantKeepsPushedWeeks(t *testing.T) {
 
 	e.google.Connect(t, e.gcal)
 	e.google.ResetEventWrites()
-	p, err := e.svc.Push(t.Context(), week)
+	p, _, err := e.svc.Push(t.Context(), week)
 	if err != nil || p.Status != plan.StatusSynced {
 		t.Fatalf("Push after connecting again = %s, %v; want synced", p.Status, err)
 	}
@@ -523,7 +523,7 @@ func TestDisconnectAfterRefusedGrant(t *testing.T) {
 	e := newEnv(t)
 	e.connectCalendar(t)
 	e.storePlan(t, week, fullWeek...)
-	if _, err := e.svc.Push(t.Context(), week); err != nil {
+	if _, _, err := e.svc.Push(t.Context(), week); err != nil {
 		t.Fatal(err)
 	}
 	e.google.RevokeGrant()
@@ -551,7 +551,7 @@ func TestPushFailsWhenPlanSwappedWhilePushing(t *testing.T) {
 	defer release()
 	pushed := make(chan error, 1)
 	go func() {
-		_, err := e.svc.Push(t.Context(), week)
+		_, _, err := e.svc.Push(t.Context(), week)
 		pushed <- err
 	}()
 	<-arrived
@@ -596,7 +596,7 @@ func TestPushAfterChoosingAnotherCalendarWritesTheWholeWeek(t *testing.T) {
 			e := newEnv(t)
 			e.connectCalendar(t)
 			dates := e.storePlan(t, week, fullWeek...)
-			first, err := e.svc.Push(t.Context(), week)
+			first, _, err := e.svc.Push(t.Context(), week)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -640,14 +640,14 @@ func TestPushAfterChoosingAnotherCalendarWritesTheWholeWeek(t *testing.T) {
 			// A push that fails part way leaves the plan changed.
 			e.google.ResetEventWrites()
 			e.google.FailEventWrite(4, http.StatusBadRequest)
-			if _, err := e.svc.Push(t.Context(), week); err == nil {
+			if _, _, err := e.svc.Push(t.Context(), week); err == nil {
 				t.Fatal("Push succeeded, want the fourth event to fail")
 			}
 			if p, err := e.svc.Get(t.Context(), week); err != nil || p.Status != plan.StatusChanged {
 				t.Errorf("plan after a failed push = %s, %v; want changed", p.Status, err)
 			}
 
-			p, err = e.svc.Push(t.Context(), week)
+			p, _, err = e.svc.Push(t.Context(), week)
 			if err != nil {
 				t.Fatalf("Push: %v", err)
 			}
@@ -678,7 +678,7 @@ func TestChoosingAnotherCalendarWaitsForAPush(t *testing.T) {
 	defer release()
 	pushed := make(chan error, 1)
 	go func() {
-		_, err := e.svc.Push(t.Context(), week)
+		_, _, err := e.svc.Push(t.Context(), week)
 		pushed <- err
 	}()
 	<-arrived
@@ -712,7 +712,7 @@ func TestChoosingAnotherCalendarWaitsForAPush(t *testing.T) {
 		}
 	}
 
-	if p, err = e.svc.Push(t.Context(), week); err != nil || p.Status != plan.StatusSynced {
+	if p, _, err = e.svc.Push(t.Context(), week); err != nil || p.Status != plan.StatusSynced {
 		t.Fatalf("Push = %s, %v; want synced", p.Status, err)
 	}
 	e.assertWeekOn(t, kitchenCal.ID, week, dates, fullWeek...)
@@ -746,7 +746,7 @@ func TestDisconnectForgetsEveryPushedWeek(t *testing.T) {
 	dates := map[store.LocalDate][]string{}
 	for _, w := range pushedWeeks {
 		dates[w] = e.storePlan(t, w, fullWeek...)
-		if _, err := e.svc.Push(t.Context(), w); err != nil {
+		if _, _, err := e.svc.Push(t.Context(), w); err != nil {
 			t.Fatalf("Push %s: %v", w, err)
 		}
 	}
@@ -764,7 +764,7 @@ func TestDisconnectForgetsEveryPushedWeek(t *testing.T) {
 	// Connecting again chooses no calendar, so nothing is pushed until one
 	// is chosen; then a push writes the whole week to it.
 	e.google.Connect(t, e.gcal)
-	if _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrNoCalendar) {
+	if _, _, err := e.svc.Push(t.Context(), week); !errors.Is(err, gcal.ErrNoCalendar) {
 		t.Fatalf("Push after connecting again = %v, want ErrNoCalendar", err)
 	}
 	e.google.SetCalendars(0, dinnersCal, kitchenCal)
@@ -773,7 +773,7 @@ func TestDisconnectForgetsEveryPushedWeek(t *testing.T) {
 	}
 	for _, w := range pushedWeeks {
 		e.assertForgotten(t, w, "after connecting again")
-		p, err := e.svc.Push(t.Context(), w)
+		p, _, err := e.svc.Push(t.Context(), w)
 		if err != nil || p.Status != plan.StatusSynced {
 			t.Fatalf("Push %s = %s, %v; want synced", w, p.Status, err)
 		}
@@ -789,7 +789,7 @@ func TestDisconnectRefusedKeepsPushedWeeks(t *testing.T) {
 	dates := map[store.LocalDate][]string{}
 	for _, w := range pushedWeeks {
 		dates[w] = e.storePlan(t, w, fullWeek...)
-		if _, err := e.svc.Push(t.Context(), w); err != nil {
+		if _, _, err := e.svc.Push(t.Context(), w); err != nil {
 			t.Fatalf("Push %s: %v", w, err)
 		}
 	}
@@ -816,7 +816,7 @@ func TestDisconnectWaitsForAPush(t *testing.T) {
 	defer release()
 	pushed := make(chan error, 1)
 	go func() {
-		_, err := e.svc.Push(t.Context(), week)
+		_, _, err := e.svc.Push(t.Context(), week)
 		pushed <- err
 	}()
 	<-arrived

internal/server/aisettings_test.go

@@ -29,7 +29,7 @@ func newAIRouter(t *testing.T) http.Handler {
 	t.Helper()
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
 	r, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t),
-		newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/dinners_test.go

@@ -92,7 +92,7 @@ func newDinnersEnv(t *testing.T) *dinnersEnv {
 		t.Fatal(err)
 	}
 	e.h, err = NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t),
-		svc, newTestSuggest(t), newTestPlan(t), newTestGoogle(t), runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		svc, newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/google_test.go

@@ -69,7 +69,7 @@ func newGoogleEnv(t *testing.T) *googleEnv {
 	}
 	logger := slog.New(slog.NewJSONHandler(e.logs, &slog.HandlerOptions{Level: slog.LevelDebug}))
 	e.h, err = NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t),
-		newTestDinners(t), newTestSuggest(t), newTestPlan(t), svc, newTestRunner(t), newTestPhotos(t),
+		newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), svc, newTestRunner(t), newTestPhotos(t),
 		fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)

internal/server/login_test.go

@@ -83,7 +83,7 @@ func newLoginRouter(t *testing.T, issuer string) http.Handler {
 		t.Fatal(err)
 	}
 	r, err := NewRouter(logger, "dev", trusted, flow, sessions, newTestSettings(t),
-		newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/media_test.go

@@ -51,7 +51,7 @@ func newMediaRouter(t *testing.T) (r http.Handler, id, orphan string) {
 		t.Fatal(err)
 	}
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	r, err = NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t),
+	r, err = NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t),
 		photos, fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)

internal/server/origin_test.go

@@ -45,7 +45,7 @@ func newOriginRouter(t *testing.T, logs io.Writer) http.Handler {
 	}
 	logger := slog.New(forwarded.LogHandler(slog.NewJSONHandler(logs, nil)))
 	r, err := NewRouter(logger, "dev", trusted, probeAuth{}, stubSessions{}, newTestSettings(t),
-		newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/plans.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"context"
 	"errors"
 	"log/slog"
 	"net/http"
@@ -9,6 +10,7 @@ import (
 
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/gcal"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/plan"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
 )
 
@@ -94,20 +96,72 @@ func putPlanDay(logger *slog.Logger, svc *plan.Service) http.HandlerFunc {
 	}
 }
 
+// pushedPlan is the POST /plans/{weekStart}/push-calendar answer: the
+// plan as synced, and what became of the week's Supply run.
+type pushedPlan struct {
+	plan.Plan
+	SupplyRun pushedSupplyRun `json:"supply_run"`
+}
+
+// pushedSupplyRun says whether a Push to Calendar made the week's Supply
+// run. status is generated when it did; archived when the week's Supply
+// run is in the Supply archive and was left as it was; or failed when it
+// was not made. A failed Supply run's error is plan_changed when the plan
+// was edited after it was pushed, so the Supply run was not made from a
+// plan Calendar does not show and pushing again makes it; or
+// supply_run_failed when it could not be made, and POST
+// /shopping/{weekStart}/generate makes it again. error is null when status
+// is generated.
+type pushedSupplyRun struct {
+	Status string    `json:"status"`
+	Error  *apiError `json:"error"`
+}
+
 // postPlanPush pushes the week's plan to the chosen Google calendar
-// (Push to Calendar) and answers with the plan as synced.
+// (Push to Calendar) and, once the push is recorded, makes the week's
-func postPlanPush(logger *slog.Logger, svc *plan.Service) http.HandlerFunc {
+// Supply run from the plan pushed. It answers with the plan as synced and
+// the Supply run's outcome.
+//
+// The Supply run is made after the push, never as part of it: Calendar
+// already shows the plan, so a Supply run that cannot be made does not
+// undo or fail the push. The answer is still 200 with supply_run failed,
+// and the failure is logged, so nothing claims a Supply run that was not
+// made. It is made only from the plan as pushed: one edited between the
+// push and the Supply run is not made into a Supply run.
+func postPlanPush(logger *slog.Logger, svc *plan.Service, shop *shopping.Service) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		week, ok := weekStartOrFail(w, r, logger)
 		if !ok {
 			return
 		}
-		p, err := svc.Push(r.Context(), week)
+		p, revision, err := svc.Push(r.Context(), week)
 		if err != nil {
 			writePlanPushError(w, r, logger, err)
 			return
 		}
-		writeJSON(w, r, logger, http.StatusOK, p)
+		// The push is done: make the Supply run even if the client has
+		// gone.
+		ctx := context.WithoutCancel(r.Context())
+		run := pushedSupplyRun{Status: "generated"}
+		if _, err := shop.GeneratePushed(ctx, week, revision); errors.Is(err, shopping.ErrFrozen) {
+			logger.InfoContext(ctx, "Supply run in the Supply archive left as it was after Push to Calendar", "week", week.String())
+			run = pushedSupplyRun{Status: "archived", Error: &apiError{Code: "archived", Message: err.Error()}}
+		} else if errors.Is(err, shopping.ErrPlanChanged) {
+			logger.WarnContext(ctx, "plan edited after Push to Calendar; Supply run not made", "week", week.String())
+			run = pushedSupplyRun{Status: "failed", Error: &apiError{
+				Code:      "plan_changed",
+				Message:   "the plan is on Calendar as pushed, but it was edited before its Supply run was made, so no Supply run was made from it; push again",
+				Retryable: true,
+			}}
+		} else if err != nil {
+			logger.ErrorContext(ctx, "generate Supply run after Push to Calendar", "week", week.String(), "error", err)
+			run = pushedSupplyRun{Status: "failed", Error: &apiError{
+				Code:      "supply_run_failed",
+				Message:   "the plan is on Calendar, but its Supply run could not be made; make it again from the Supply run",
+				Retryable: true,
+			}}
+		}
+		writeJSON(w, r, logger, http.StatusOK, pushedPlan{Plan: p, SupplyRun: run})
 	}
 }
 

internal/server/plans_test.go

@@ -23,6 +23,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/plan"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
 )
 
@@ -36,6 +37,8 @@ type plansEnv struct {
 	h        http.Handler
 	st       *store.Store
 	svc      *plan.Service
+	shop     *shopping.Service
+	runner   *jobs.Runner
 	questLog string
 	// google is the fake Google the plan service pushes to; it starts
 	// unconnected.
@@ -46,6 +49,13 @@ type plansEnv struct {
 }
 
 func newPlansRouter(t *testing.T) plansEnv {
+	t.Helper()
+	return newPlansRouterTitled(t, untitled)
+}
+
+// newPlansRouterTitled is newPlansRouter whose Supply runs are titled by
+// title.
+func newPlansRouterTitled(t *testing.T, title shopping.Titler) plansEnv {
 	t.Helper()
 	st := newTestStore(t)
 	ctx := t.Context()
@@ -79,8 +89,12 @@ func newPlansRouter(t *testing.T) plansEnv {
 	if err != nil {
 		t.Fatal(err)
 	}
+	shop, err := shopping.NewService(st, title, runner, logger)
+	if err != nil {
+		t.Fatal(err)
+	}
 	h, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t),
-		newTestDinners(t), newTestSuggest(t), svc, googleSvc, runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestDinners(t), newTestSuggest(t), svc, shop, googleSvc, runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -114,7 +128,7 @@ func newPlansRouter(t *testing.T) plansEnv {
 			t.Fatal(err)
 		}
 	}
-	return plansEnv{h: h, st: st, svc: svc, questLog: dinner("Pad Thai", "quest_log", "stovetop", 35),
+	return plansEnv{h: h, st: st, svc: svc, shop: shop, runner: runner, questLog: dinner("Pad Thai", "quest_log", "stovetop", 35),
 		google: google, gcal: googleSvc, logs: logs}
 }
 

internal/server/recipesearch_test.go

@@ -22,7 +22,7 @@ const (
 func newRecipeSearchRouter(t *testing.T, search *recipes.SearchSettingsService) http.Handler {
 	t.Helper()
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	r, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), search, newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t),
+	r, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), search, newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t),
 		newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)

internal/server/server.go

@@ -19,6 +19,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/plan"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/recipes"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/suggest"
 )
 
@@ -46,7 +47,12 @@ type RouteMounter interface {
 // /decline; planSvc serves GET /api/v1/plans/{weekStart}, POST
 // /api/v1/plans/{weekStart}/draft, PUT
 // /api/v1/plans/{weekStart}/days/{date}, GET /api/v1/rotation-reviews and
-// POST /api/v1/dinners/{id}/rotation-review; googleSvc serves GET
+// POST /api/v1/dinners/{id}/rotation-review, and POST
+// /api/v1/plans/{weekStart}/push-calendar with shopSvc, which makes the
+// pushed week's Supply run; shopSvc serves GET /api/v1/shopping/archive,
+// GET /api/v1/shopping/{weekStart},
+// POST /api/v1/shopping/{weekStart}/generate and PATCH
+// /api/v1/shopping/items/{id}; googleSvc serves GET
 // /api/v1/integrations/google and its /connect, /callback and /calendars,
 // PUT /api/v1/integrations/google/calendar and DELETE
 // /api/v1/integrations/google; runner serves
@@ -54,7 +60,7 @@ type RouteMounter interface {
 // GET /media/photos/{id}-{size}.jpg; assets is the web build
 // served for every other GET. /health, /auth and the web build are public.
 // Requests to /api/v1 other than GET also need the session's CSRF token in CSRFHeader.
-func NewRouter(logger *slog.Logger, version string, trusted forwarded.Trusted, auth RouteMounter, sessions SessionLookup, settings *household.SettingsService, search *recipes.SearchSettingsService, ai *aisettings.Service, dinnerSvc *dinners.Service, suggestSvc *suggest.Service, planSvc *plan.Service, googleSvc *gcal.Service, runner *jobs.Runner, photos PhotoFiles, assets fs.FS) (http.Handler, error) {
+func NewRouter(logger *slog.Logger, version string, trusted forwarded.Trusted, auth RouteMounter, sessions SessionLookup, settings *household.SettingsService, search *recipes.SearchSettingsService, ai *aisettings.Service, dinnerSvc *dinners.Service, suggestSvc *suggest.Service, planSvc *plan.Service, shopSvc *shopping.Service, googleSvc *gcal.Service, runner *jobs.Runner, photos PhotoFiles, assets fs.FS) (http.Handler, error) {
 	if settings == nil {
 		return nil, errors.New("server: nil household settings service")
 	}
@@ -73,6 +79,9 @@ func NewRouter(logger *slog.Logger, version string, trusted forwarded.Trusted, a
 	if planSvc == nil {
 		return nil, errors.New("server: nil plan service")
 	}
+	if shopSvc == nil {
+		return nil, errors.New("server: nil shopping service")
+	}
 	if googleSvc == nil {
 		return nil, errors.New("server: nil Google Calendar service")
 	}
@@ -133,7 +142,11 @@ func NewRouter(logger *slog.Logger, version string, trusted forwarded.Trusted, a
 	apiV1.Get("/plans/{weekStart}", getPlan(logger, planSvc))
 	apiV1.Post("/plans/{weekStart}/draft", postPlanDraft(logger, planSvc))
 	apiV1.Put("/plans/{weekStart}/days/{date}", putPlanDay(logger, planSvc))
-	apiV1.Post("/plans/{weekStart}/push-calendar", postPlanPush(logger, planSvc))
+	apiV1.Post("/plans/{weekStart}/push-calendar", postPlanPush(logger, planSvc, shopSvc))
+	apiV1.Get("/shopping/archive", getSupplyArchive(logger, shopSvc))
+	apiV1.Get("/shopping/{weekStart}", getSupplyRun(logger, shopSvc))
+	apiV1.Post("/shopping/{weekStart}/generate", postSupplyRunGenerate(logger, shopSvc))
+	apiV1.Patch("/shopping/items/{id}", patchShoppingItem(logger, shopSvc))
 	apiV1.Get("/rotation-reviews", getRotationReviews(logger, planSvc))
 	apiV1.Post("/dinners/{id}/rotation-review", postRotationReview(logger, planSvc))
 	// connect and callback are top-level browser navigations, so they are

internal/server/server_test.go

@@ -30,6 +30,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/recipes"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/recipes/recipestest"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/secretbox"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/suggest"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/migrations"
@@ -53,7 +54,7 @@ func newTestRouterWith(t *testing.T, version string, settings *household.Setting
 		"index.html":             {Data: []byte(fixtureIndex)},
 		"assets/index-AbC123.js": {Data: []byte(fixtureAsset)},
 	}
-	r, err := NewRouter(logger, version, nil, stubAuth{}, stubSessions{}, settings, newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), runner, newTestPhotos(t), assets)
+	r, err := NewRouter(logger, version, nil, stubAuth{}, stubSessions{}, settings, newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), runner, newTestPhotos(t), assets)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -209,6 +210,29 @@ func newTestPlan(t *testing.T) *plan.Service {
 	return svc
 }
 
+// newTestShopping returns a shopping service over a migrated temp
+// database, whose Supply runs stay untitled.
+func newTestShopping(t *testing.T) *shopping.Service {
+	t.Helper()
+	st := newTestStore(t)
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	runner, err := jobs.NewRunner(st, logger, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, err := shopping.NewService(st, untitled, runner, logger)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return svc
+}
+
+// untitled is a shopping.Titler with no model: every Supply run it is
+// asked to title stays untitled.
+func untitled(context.Context, string, skills.ArchiveTitleRequest) (skills.ArchiveTitle, error) {
+	return skills.ArchiveTitle{}, errors.New("no model in this test")
+}
+
 // newTestBox returns a secret box under a random key.
 func newTestBox(t *testing.T) *secretbox.Box {
 	t.Helper()
@@ -263,7 +287,7 @@ func TestNewRouterRequiresAISettings(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), nil, newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), nil, newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil AI settings service")
 	}
 }
@@ -272,7 +296,7 @@ func TestNewRouterRequiresSearchSettings(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), nil, newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), nil, newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil recipe search settings service")
 	}
 }
@@ -281,7 +305,7 @@ func TestNewRouterRequiresPhotoFiles(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), nil, fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), nil, fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted nil photo files")
 	}
 }
@@ -290,7 +314,7 @@ func TestNewRouterRequiresSettings(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, nil, newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, nil, newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil settings service")
 	}
 }
@@ -299,7 +323,7 @@ func TestNewRouterRequiresDinners(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), nil, newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), nil, newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil dinners service")
 	}
 }
@@ -308,7 +332,7 @@ func TestNewRouterRequiresSuggestions(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), nil, newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), nil, newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil suggestions service")
 	}
 }
@@ -317,16 +341,25 @@ func TestNewRouterRequiresPlan(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), nil, newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), nil, newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil plan service")
 	}
 }
 
+func TestNewRouterRequiresShopping(t *testing.T) {
+	t.Parallel()
+
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), nil, newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+		t.Fatal("NewRouter accepted a nil shopping service")
+	}
+}
+
 func TestNewRouterRequiresGoogle(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), nil, newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), nil, newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil Google Calendar service")
 	}
 }
@@ -335,7 +368,7 @@ func TestNewRouterRequiresJobRunner(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), nil, newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), nil, newTestPhotos(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil job runner")
 	}
 }

internal/server/settings_test.go

@@ -277,7 +277,7 @@ func TestHouseholdSettingsWithRealSession(t *testing.T) {
 	}
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
 	router, err := NewRouter(logger, "dev", nil, stubAuth{}, sessions, household.NewSettingsService(st),
-		newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestSearch(t), newTestAI(t), newTestDinners(t), newTestSuggest(t), newTestPlan(t), newTestShopping(t), newTestGoogle(t), newTestRunner(t), newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/shopping.go

@@ -0,0 +1,262 @@
+package server
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+// maxShoppingItemBody bounds a PATCH /shopping/items/{id} body.
+const maxShoppingItemBody = 1 << 10
+
+// supplyRun is a Supply run as the API shows it. label is the week label,
+// which stands in for title until the AI writes one.
+type supplyRun struct {
+	WeekStart    string  `json:"weekStart"`
+	Label        string  `json:"label"`
+	Title        *string `json:"title"`
+	Status       string  `json:"status"`
+	SentToChatAt *string `json:"sent_to_chat_at"`
+	shopping.Counts
+	Groups []supplyRunGroup `json:"groups"`
+}
+
+// supplyRunGroup is the items of one plan day's dinner. day is the plan
+// day's weekday, such as "Monday".
+type supplyRunGroup struct {
+	Dinner supplyRunDinner `json:"dinner"`
+	Date   string          `json:"date"`
+	Day    string          `json:"day"`
+	Items  []supplyRunItem `json:"items"`
+}
+
+type supplyRunDinner struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+// supplyRunItem is one ingredient to buy; qty is null when the recipe
+// gives none, and needed is false once it is marked "have it".
+type supplyRunItem struct {
+	ID     string  `json:"id"`
+	Name   string  `json:"name"`
+	Qty    *string `json:"qty"`
+	Needed bool    `json:"needed"`
+}
+
+// generatedSupplyRun is the POST /shopping/{weekStart}/generate answer:
+// the Supply run as made, and the plan days with nothing to shop for.
+type generatedSupplyRun struct {
+	supplyRun
+	Skipped []shopping.SkippedDay `json:"skipped"`
+}
+
+// shoppingItemPatch is the PATCH /shopping/items/{id} body.
+type shoppingItemPatch struct {
+	Needed *bool `json:"needed"`
+}
+
+// toggledItem is the PATCH /shopping/items/{id} answer: the item's flag
+// and its Supply run's counts after the change.
+type toggledItem struct {
+	ID     string `json:"id"`
+	Needed bool   `json:"needed"`
+	shopping.Counts
+}
+
+// getSupplyRun answers GET /shopping/{weekStart} with the week's Supply
+// run.
+func getSupplyRun(logger *slog.Logger, svc *shopping.Service) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		week, ok := weekStartOrFail(w, r, logger)
+		if !ok {
+			return
+		}
+		l, err := svc.Get(r.Context(), week)
+		if err != nil {
+			writeShoppingError(w, r, logger, "read Supply run", err)
+			return
+		}
+		out, err := supplyRunOf(week, l)
+		if err != nil {
+			writeShoppingError(w, r, logger, "read Supply run", err)
+			return
+		}
+		writeJSON(w, r, logger, http.StatusOK, out)
+	}
+}
+
+// postSupplyRunGenerate makes, or remakes, the week's Supply run from its
+// plan and answers with it and the plan days it skipped.
+func postSupplyRunGenerate(logger *slog.Logger, svc *shopping.Service) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		week, ok := weekStartOrFail(w, r, logger)
+		if !ok {
+			return
+		}
+		g, err := svc.Generate(r.Context(), week)
+		if err != nil {
+			writeShoppingError(w, r, logger, "generate Supply run", err)
+			return
+		}
+		out, err := supplyRunOf(week, g.List)
+		if err != nil {
+			writeShoppingError(w, r, logger, "generate Supply run", err)
+			return
+		}
+		skipped := g.Skipped
+		if skipped == nil {
+			skipped = []shopping.SkippedDay{}
+		}
+		writeJSON(w, r, logger, http.StatusOK, generatedSupplyRun{supplyRun: out, Skipped: skipped})
+	}
+}
+
+// patchShoppingItem marks a Supply run item needed or "have it" and
+// answers with its Supply run's new counts.
+func patchShoppingItem(logger *slog.Logger, svc *shopping.Service) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		body, err := decodePatch[shoppingItemPatch](http.MaxBytesReader(w, r.Body, maxShoppingItemBody))
+		if err != nil {
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", err.Error())
+			return
+		}
+		if body.Needed == nil {
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", "needed: required")
+			return
+		}
+		id := chi.URLParam(r, "id")
+		c, err := svc.SetNeeded(r.Context(), id, *body.Needed)
+		if err != nil {
+			writeShoppingError(w, r, logger, "mark Supply run item", err)
+			return
+		}
+		writeJSON(w, r, logger, http.StatusOK, toggledItem{ID: id, Needed: *body.Needed, Counts: c})
+	}
+}
+
+// supplyArchive is the GET /shopping/archive answer: the Supply archive's
+// periods, newest first, as grouped by by.
+type supplyArchive struct {
+	By      string          `json:"by"`
+	Periods []archivePeriod `json:"periods"`
+}
+
+// archivePeriod is one heading of the Supply archive and its posts,
+// newest first.
+type archivePeriod struct {
+	Key     string        `json:"key"`
+	Heading string        `json:"heading"`
+	Posts   []archivePost `json:"posts"`
+}
+
+// archivePost is one week's Supply run in the Supply archive. label is
+// the week label, which stands in for title while it is null, and
+// onHandCount counts the items marked "have it".
+type archivePost struct {
+	WeekStart   string   `json:"weekStart"`
+	Label       string   `json:"label"`
+	Title       *string  `json:"title"`
+	DinnerCount int      `json:"dinnerCount"`
+	ItemCount   int      `json:"itemCount"`
+	OnHandCount int      `json:"onHandCount"`
+	Dinners     []string `json:"dinners"`
+	Current     bool     `json:"current"`
+}
+
+// getSupplyArchive answers GET /shopping/archive?by=week|month|year with
+// the Supply archive grouped by that period.
+func getSupplyArchive(logger *slog.Logger, svc *shopping.Service) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		by := r.URL.Query().Get("by")
+		periods, err := svc.Archive(r.Context(), by)
+		if errors.Is(err, shopping.ErrInvalidPeriod) {
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", shopping.ErrInvalidPeriod.Error())
+			return
+		}
+		if err != nil {
+			writeShoppingError(w, r, logger, "read Supply archive", err)
+			return
+		}
+		out := supplyArchive{By: by, Periods: make([]archivePeriod, len(periods))}
+		for i, p := range periods {
+			posts := make([]archivePost, len(p.Posts))
+			for j, post := range p.Posts {
+				posts[j] = archivePost{
+					WeekStart:   post.WeekStart,
+					Label:       post.Label,
+					Title:       post.Title,
+					DinnerCount: len(post.Dinners),
+					ItemCount:   post.Items,
+					OnHandCount: post.OnHand,
+					Dinners:     post.Dinners,
+					Current:     post.Current,
+				}
+			}
+			out.Periods[i] = archivePeriod{Key: p.Key, Heading: p.Heading, Posts: posts}
+		}
+		writeJSON(w, r, logger, http.StatusOK, out)
+	}
+}
+
+// supplyRunOf is l, the Supply run of the week starting week, as the API
+// shows it.
+func supplyRunOf(week store.LocalDate, l shopping.List) (supplyRun, error) {
+	label, err := household.WeekLabel(week)
+	if err != nil {
+		return supplyRun{}, err
+	}
+	groups := make([]supplyRunGroup, len(l.Groups))
+	for i, g := range l.Groups {
+		date, err := time.Parse(time.DateOnly, g.Date)
+		if err != nil {
+			return supplyRun{}, fmt.Errorf("group %s date: %w", g.ID, err)
+		}
+		items := make([]supplyRunItem, len(g.Items))
+		for j, it := range g.Items {
+			items[j] = supplyRunItem{ID: it.ID, Name: it.Name, Qty: it.Qty, Needed: it.Needed}
+		}
+		groups[i] = supplyRunGroup{
+			Dinner: supplyRunDinner{ID: g.DinnerID, Name: g.DinnerName},
+			Date:   g.Date,
+			Day:    date.Weekday().String(),
+			Items:  items,
+		}
+	}
+	return supplyRun{
+		WeekStart:    l.WeekStart,
+		Label:        label,
+		Title:        l.Title,
+		Status:       l.Status,
+		SentToChatAt: l.SentToChatAt,
+		Counts:       l.Counts(),
+		Groups:       groups,
+	}, nil
+}
+
+// writeShoppingError maps a shopping.Service error to its API error: a
+// week with no Supply run or no plan, or an unknown item, is 404, and a
+// change to a Supply run in the Supply archive is 409 archived.
+func writeShoppingError(w http.ResponseWriter, r *http.Request, logger *slog.Logger, action string, err error) {
+	switch {
+	case errors.Is(err, shopping.ErrListNotFound):
+		writeError(w, r, logger, http.StatusNotFound, "not_found", "Supply run not found")
+	case errors.Is(err, shopping.ErrItemNotFound):
+		writeError(w, r, logger, http.StatusNotFound, "not_found", "Supply run item not found")
+	case errors.Is(err, shopping.ErrPlanNotFound):
+		writeError(w, r, logger, http.StatusNotFound, "not_found", "plan not found")
+	case errors.Is(err, shopping.ErrFrozen):
+		writeError(w, r, logger, http.StatusConflict, "archived", err.Error())
+	default:
+		logger.ErrorContext(r.Context(), action, "error", err)
+		writeError(w, r, logger, http.StatusInternalServerError, "internal", "internal error")
+	}
+}

internal/server/shopping_test.go

@@ -0,0 +1,789 @@
+package server
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"reflect"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/harness"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/skills"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/plan"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+const shoppingPath = "/api/v1/shopping/"
+
+// shopIng is a recipe ingredient as recipe grounding stores it: an empty
+// qty or unit is NULL.
+type shopIng struct {
+	name, qty, unit string
+}
+
+// groundDay grounds the dinner planned on date of the plans env's week in
+// a fetched recipe listing ings.
+func (e plansEnv) groundDay(t *testing.T, date string, ings ...shopIng) {
+	t.Helper()
+	ctx := t.Context()
+	q := db.New(e.st.Writer)
+	now := store.Now().String()
+	r, err := q.UpsertRecipe(ctx, db.UpsertRecipeParams{
+		ID: store.NewID(), SourceUrl: "https://recipes.example/" + date, Title: "Recipe of " + date,
+		RawJsonld: "{}", FetchedAt: now, CreatedAt: now, UpdatedAt: now,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i, in := range ings {
+		if err := q.CreateRecipeIngredient(ctx, db.CreateRecipeIngredientParams{
+			ID: store.NewID(), RecipeID: r.ID, Position: int64(i),
+			RawText:   strings.TrimSpace(in.qty + " " + in.unit + " " + in.name),
+			Name:      sql.NullString{String: in.name, Valid: true},
+			Qty:       sql.NullString{String: in.qty, Valid: in.qty != ""},
+			Unit:      sql.NullString{String: in.unit, Valid: in.unit != ""},
+			CreatedAt: now, UpdatedAt: now,
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if _, err := e.st.Writer.ExecContext(ctx, `UPDATE dinners SET recipe_id = ?, grounding_status = 'grounded'
+		WHERE id = (SELECT dinner_id FROM plan_days WHERE date = ?)`, r.ID, date); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// groundWeek grounds Monday's Beef Chili and Tuesday's Regular: five items,
+// one with no quantity.
+func (e plansEnv) groundWeek(t *testing.T) {
+	t.Helper()
+	e.groundDay(t, "2026-10-12", shopIng{"ground beef", "1", "lb"}, shopIng{"kidney beans", "2", "cans"}, shopIng{"onion", "1", ""})
+	e.groundDay(t, "2026-10-13", shopIng{"spaghetti", "500", "g"}, shopIng{"basil", "", ""})
+}
+
+// archive freezes the week's Supply run into the Supply archive.
+func (e plansEnv) archive(t *testing.T) {
+	t.Helper()
+	if _, err := e.st.Writer.ExecContext(t.Context(),
+		`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'`); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// supplyRunJSON is a Supply run answer decoded with every field the API
+// promises.
+type supplyRunJSON struct {
+	WeekStart    string  `json:"weekStart"`
+	Label        string  `json:"label"`
+	Title        *string `json:"title"`
+	Status       string  `json:"status"`
+	SentToChatAt *string `json:"sent_to_chat_at"`
+	NeededCount  int     `json:"needed_count"`
+	TotalCount   int     `json:"total_count"`
+	Groups       []struct {
+		Dinner struct {
+			ID   string `json:"id"`
+			Name string `json:"name"`
+		} `json:"dinner"`
+		Date  string `json:"date"`
+		Day   string `json:"day"`
+		Items []struct {
+			ID     string  `json:"id"`
+			Name   string  `json:"name"`
+			Qty    *string `json:"qty"`
+			Needed bool    `json:"needed"`
+		} `json:"items"`
+	} `json:"groups"`
+}
+
+// render is l one item a line as "day date dinner: name [qty] needed|have
+// it".
+func (l supplyRunJSON) render() []string {
+	var out []string
+	for _, g := range l.Groups {
+		for _, it := range g.Items {
+			qty := "null"
+			if it.Qty != nil {
+				qty = *it.Qty
+			}
+			mark := "needed"
+			if !it.Needed {
+				mark = "have it"
+			}
+			out = append(out, g.Day+" "+g.Date+" "+g.Dinner.Name+": "+it.Name+" ["+qty+"] "+mark)
+		}
+	}
+	return out
+}
+
+// itemID is the id of the item named name.
+func (l supplyRunJSON) itemID(t *testing.T, name string) string {
+	t.Helper()
+	for _, g := range l.Groups {
+		for _, it := range g.Items {
+			if it.Name == name {
+				return it.ID
+			}
+		}
+	}
+	t.Fatalf("no item %q", name)
+	return ""
+}
+
+// callShopping makes a request and decodes a 200 answer into out.
+func callShopping(t *testing.T, e plansEnv, method, target, body string, out any) (int, map[string]any) {
+	t.Helper()
+	rec, got := callDinners(t, e.h, method, target, body)
+	if rec.Code == http.StatusOK && out != nil {
+		if err := json.Unmarshal(rec.Body.Bytes(), out); err != nil {
+			t.Fatal(err)
+		}
+	}
+	return rec.Code, got
+}
+
+func keys(m map[string]any) []string {
+	var out []string
+	for k := range m {
+		out = append(out, k)
+	}
+	slices.Sort(out)
+	return out
+}
+
+var weekLines = []string{
+	"Monday 2026-10-12 Beef Chili: ground beef [1 lb] needed",
+	"Monday 2026-10-12 Beef Chili: kidney beans [2 cans] needed",
+	"Monday 2026-10-12 Beef Chili: onion [1] needed",
+	"Tuesday 2026-10-13 Regular 2026-10-13: spaghetti [500 g] needed",
+	"Tuesday 2026-10-13 Regular 2026-10-13: basil [null] needed",
+}
+
+// TestSupplyRunShape generates the week's Supply run and reads it back:
+// both answers carry exactly the promised fields.
+func TestSupplyRunShape(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+
+	if status, body := callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", nil); status != http.StatusNotFound || errorCode(body) != "not_found" {
+		t.Fatalf("GET before generating = %d %v, want 404 not_found", status, body)
+	}
+
+	var made supplyRunJSON
+	status, raw := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &made)
+	if status != http.StatusOK {
+		t.Fatalf("generate = %d %v", status, raw)
+	}
+	wantTop := []string{"groups", "label", "needed_count", "sent_to_chat_at", "skipped", "status", "title", "total_count", "weekStart"}
+	if got := keys(raw); !reflect.DeepEqual(got, wantTop) {
+		t.Errorf("generate fields = %v, want %v", got, wantTop)
+	}
+	if skipped, _ := raw["skipped"].([]any); len(skipped) != 5 {
+		t.Errorf("skipped = %v, want the five days without a recipe", raw["skipped"])
+	}
+
+	var got supplyRunJSON
+	status, raw = callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &got)
+	if status != http.StatusOK {
+		t.Fatalf("GET = %d %v", status, raw)
+	}
+	if k := keys(raw); !reflect.DeepEqual(k, slices.DeleteFunc(slices.Clone(wantTop), func(s string) bool { return s == "skipped" })) {
+		t.Errorf("GET fields = %v", k)
+	}
+	group := raw["groups"].([]any)[0].(map[string]any)
+	if k := keys(group); !reflect.DeepEqual(k, []string{"date", "day", "dinner", "items"}) {
+		t.Errorf("group fields = %v", k)
+	}
+	if k := keys(group["dinner"].(map[string]any)); !reflect.DeepEqual(k, []string{"id", "name"}) {
+		t.Errorf("dinner fields = %v", k)
+	}
+	if k := keys(group["items"].([]any)[0].(map[string]any)); !reflect.DeepEqual(k, []string{"id", "name", "needed", "qty"}) {
+		t.Errorf("item fields = %v", k)
+	}
+	if !reflect.DeepEqual(got, made) {
+		t.Errorf("GET = %+v, want what generate made %+v", got, made)
+	}
+	if got.WeekStart != "2026-10-12" || got.Label != "Week 42 · Oct 12 – 18" || got.Title != nil ||
+		got.Status != "current" || got.SentToChatAt != nil || got.NeededCount != 5 || got.TotalCount != 5 {
+		t.Errorf("GET = %+v", got)
+	}
+	if !reflect.DeepEqual(got.render(), weekLines) {
+		t.Errorf("items =\n  %s\nwant\n  %s", strings.Join(got.render(), "\n  "), strings.Join(weekLines, "\n  "))
+	}
+	if got.Groups[0].Dinner.ID == "" || got.Groups[0].Items[0].ID == "" {
+		t.Errorf("ids missing: %+v", got.Groups[0])
+	}
+}
+
+// TestShoppingItemToggle marks items "have it" and needed again: each
+// answer carries the item and the new counts, and the list read back
+// agrees.
+func TestShoppingItemToggle(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	var l supplyRunJSON
+	if status, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &l); status != http.StatusOK {
+		t.Fatalf("generate = %d %v", status, body)
+	}
+	onion, basil := l.itemID(t, "onion"), l.itemID(t, "basil")
+
+	for _, step := range []struct {
+		id           string
+		needed       bool
+		neededCount  int
+		wantAfterGet string
+	}{
+		{onion, false, 4, "Monday 2026-10-12 Beef Chili: onion [1] have it"},
+		{onion, false, 4, "Monday 2026-10-12 Beef Chili: onion [1] have it"}, // sets, never flips
+		{basil, false, 3, "Tuesday 2026-10-13 Regular 2026-10-13: basil [null] have it"},
+		{onion, true, 4, "Monday 2026-10-12 Beef Chili: onion [1] needed"},
+	} {
+		body := `{"needed":false}`
+		if step.needed {
+			body = `{"needed":true}`
+		}
+		status, got := callShopping(t, e, http.MethodPatch, shoppingPath+"items/"+step.id, body, nil)
+		want := map[string]any{"id": step.id, "needed": step.needed, "needed_count": float64(step.neededCount), "total_count": float64(5)}
+		if status != http.StatusOK || !reflect.DeepEqual(got, want) {
+			t.Fatalf("PATCH %s = %d %v, want %v", body, status, got, want)
+		}
+		var after supplyRunJSON
+		callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &after)
+		if after.NeededCount != step.neededCount || after.TotalCount != 5 || !slices.Contains(after.render(), step.wantAfterGet) {
+			t.Errorf("GET after PATCH %s = %d/%d %v", body, after.NeededCount, after.TotalCount, after.render())
+		}
+	}
+}
+
+func TestShoppingItemToggleErrors(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	var l supplyRunJSON
+	callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &l)
+	onion := l.itemID(t, "onion")
+
+	for _, tc := range []struct {
+		name, id, body string
+		status         int
+		code           string
+	}{
+		{"no needed", onion, `{}`, http.StatusBadRequest, "invalid_request"},
+		{"needed null", onion, `{"needed":null}`, http.StatusBadRequest, "invalid_request"},
+		{"needed not a bool", onion, `{"needed":"no"}`, http.StatusBadRequest, "invalid_request"},
+		{"unknown field", onion, `{"needed":false,"qty":"2"}`, http.StatusBadRequest, "invalid_request"},
+		{"unknown item", store.NewID(), `{"needed":false}`, http.StatusNotFound, "not_found"},
+	} {
+		status, body := callShopping(t, e, http.MethodPatch, shoppingPath+"items/"+tc.id, tc.body, nil)
+		if status != tc.status || errorCode(body) != tc.code {
+			t.Errorf("%s: PATCH = %d %v, want %d %s", tc.name, status, body, tc.status, tc.code)
+		}
+	}
+
+	e.archive(t)
+	status, body := callShopping(t, e, http.MethodPatch, shoppingPath+"items/"+onion, `{"needed":false}`, nil)
+	if status != http.StatusConflict || errorCode(body) != "archived" {
+		t.Errorf("PATCH of an archived list = %d %v, want 409 archived", status, body)
+	}
+	var after supplyRunJSON
+	callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &after)
+	if after.Status != "archived" || !reflect.DeepEqual(after.render(), weekLines) || after.NeededCount != 5 {
+		t.Errorf("archived list after PATCH = %s %v, want unchanged", after.Status, after.render())
+	}
+}
+
+// TestSupplyRunRegenerate remakes the list after a swap: the swapped-out
+// dinner's group goes, and what the household marked "have it" stays.
+func TestSupplyRunRegenerate(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	var l supplyRunJSON
+	callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &l)
+	onion := l.itemID(t, "onion")
+	callShopping(t, e, http.MethodPatch, shoppingPath+"items/"+onion, `{"needed":false}`, nil)
+	if _, err := e.svc.Swap(t.Context(), mustLocalDate(t, "2026-10-12"), "2026-10-13", e.questLog); err != nil {
+		t.Fatal(err)
+	}
+
+	var again supplyRunJSON
+	if status, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &again); status != http.StatusOK {
+		t.Fatalf("generate again = %d %v", status, body)
+	}
+	want := []string{
+		"Monday 2026-10-12 Beef Chili: ground beef [1 lb] needed",
+		"Monday 2026-10-12 Beef Chili: kidney beans [2 cans] needed",
+		"Monday 2026-10-12 Beef Chili: onion [1] have it",
+	}
+	if !reflect.DeepEqual(again.render(), want) || again.NeededCount != 2 || again.TotalCount != 3 {
+		t.Errorf("remade = %d/%d %v, want 2/3 %v", again.NeededCount, again.TotalCount, again.render(), want)
+	}
+	if again.itemID(t, "onion") != onion {
+		t.Error("onion has a new id after the remake")
+	}
+}
+
+func TestSupplyRunErrors(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	for _, tc := range []struct {
+		name, method, path string
+		status             int
+		code               string
+	}{
+		{"GET not a Monday", http.MethodGet, "2026-10-13", http.StatusBadRequest, "invalid_week"},
+		{"GET no list", http.MethodGet, "2026-10-19", http.StatusNotFound, "not_found"},
+		{"generate not a Monday", http.MethodPost, "2026-10-13/generate", http.StatusBadRequest, "invalid_week"},
+		{"generate no plan", http.MethodPost, "2026-10-19/generate", http.StatusNotFound, "not_found"},
+	} {
+		status, body := callShopping(t, e, tc.method, shoppingPath+tc.path, "", nil)
+		if status != tc.status || errorCode(body) != tc.code {
+			t.Errorf("%s = %d %v, want %d %s", tc.name, status, body, tc.status, tc.code)
+		}
+	}
+
+	callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", nil)
+	e.archive(t)
+	status, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", nil)
+	if status != http.StatusConflict || errorCode(body) != "archived" {
+		t.Errorf("generate of an archived list = %d %v, want 409 archived", status, body)
+	}
+}
+
+// TestPushPlanMakesSupplyRun: a Push to Calendar makes the week's Supply
+// run from the plan pushed.
+func TestPushPlanMakesSupplyRun(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	e.connectCalendar(t, true)
+
+	rec, body := e.push(t, "2026-10-12")
+	if rec.Code != http.StatusOK || body["status"] != "synced" {
+		t.Fatalf("push = %d %s", rec.Code, rec.Body)
+	}
+	if want := map[string]any{"status": "generated", "error": nil}; !reflect.DeepEqual(body["supply_run"], want) {
+		t.Errorf("supply_run = %v, want %v", body["supply_run"], want)
+	}
+	var l supplyRunJSON
+	if status, got := callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &l); status != http.StatusOK {
+		t.Fatalf("GET after push = %d %v, want the Supply run", status, got)
+	}
+	if !reflect.DeepEqual(l.render(), weekLines) {
+		t.Errorf("Supply run after push = %v", l.render())
+	}
+}
+
+// heldTitler is a shopping.Titler that reports each call on entered and
+// answers title only once release is closed.
+type heldTitler struct {
+	entered chan struct{}
+	release chan struct{}
+}
+
+func newHeldTitler() heldTitler {
+	return heldTitler{entered: make(chan struct{}, 4), release: make(chan struct{})}
+}
+
+func (h heldTitler) title(ctx context.Context, _ string, _ skills.ArchiveTitleRequest) (skills.ArchiveTitle, error) {
+	h.entered <- struct{}{}
+	select {
+	case <-h.release:
+		return skills.ArchiveTitle{Title: "Chili and Friends"}, nil
+	case <-ctx.Done():
+		return skills.ArchiveTitle{}, ctx.Err()
+	}
+}
+
+// startRunner starts e's job runner, stopping it when the test ends. e's
+// logs must not be read while it runs.
+func (e plansEnv) startRunner(t *testing.T) {
+	t.Helper()
+	ctx, cancel := context.WithCancel(context.Background())
+	if err := e.runner.Start(ctx); err != nil {
+		cancel()
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		cancel()
+		e.runner.Wait()
+	})
+}
+
+// waitEntered waits for the title call to begin.
+func (h heldTitler) waitEntered(t *testing.T) {
+	t.Helper()
+	select {
+	case <-h.entered:
+	case <-time.After(10 * time.Second):
+		t.Fatal("archive_title was never called")
+	}
+}
+
+// waitTitled waits for the week's Supply run to have a title through GET
+// and returns it.
+func (e plansEnv) waitTitled(t *testing.T) string {
+	t.Helper()
+	deadline := time.Now().Add(10 * time.Second)
+	for {
+		var l supplyRunJSON
+		callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &l)
+		if l.Title != nil {
+			return *l.Title
+		}
+		if time.Now().After(deadline) {
+			t.Fatal("the Supply run was never titled")
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+}
+
+// TestPushPlanDoesNotWaitForTitle: Push to Calendar answers while the
+// Supply run's title is still being written; the list reads untitled until
+// the title job stores it.
+func TestPushPlanDoesNotWaitForTitle(t *testing.T) {
+	t.Parallel()
+	held := newHeldTitler()
+	e := newPlansRouterTitled(t, held.title)
+	e.groundWeek(t)
+	e.connectCalendar(t, true)
+	e.startRunner(t)
+
+	rec, body := callDinners(t, e.h, http.MethodPost, plansPath+"2026-10-12/push-calendar", "")
+	if rec.Code != http.StatusOK || body["status"] != "synced" {
+		t.Fatalf("push = %d %s", rec.Code, rec.Body)
+	}
+	if want := map[string]any{"status": "generated", "error": nil}; !reflect.DeepEqual(body["supply_run"], want) {
+		t.Errorf("supply_run = %v, want %v", body["supply_run"], want)
+	}
+	held.waitEntered(t)
+	var l supplyRunJSON
+	callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &l)
+	if l.Title != nil {
+		t.Errorf("title = %q while archive_title is still running, want null", *l.Title)
+	}
+
+	close(held.release)
+	if got := e.waitTitled(t); got != "Chili and Friends" {
+		t.Errorf("title = %q, want the title job's", got)
+	}
+}
+
+// TestSupplyRunGenerateDoesNotWaitForTitle: POST generate answers with the
+// list untitled while its title is still being written.
+func TestSupplyRunGenerateDoesNotWaitForTitle(t *testing.T) {
+	t.Parallel()
+	held := newHeldTitler()
+	e := newPlansRouterTitled(t, held.title)
+	e.groundWeek(t)
+	e.startRunner(t)
+
+	var l supplyRunJSON
+	if status, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &l); status != http.StatusOK {
+		t.Fatalf("generate = %d %v", status, body)
+	}
+	if l.Title != nil {
+		t.Errorf("title = %q while archive_title is still running, want null", *l.Title)
+	}
+	if !reflect.DeepEqual(l.render(), weekLines) {
+		t.Errorf("generated = %v, want %v", l.render(), weekLines)
+	}
+	held.waitEntered(t)
+
+	close(held.release)
+	if got := e.waitTitled(t); got != "Chili and Friends" {
+		t.Errorf("title = %q, want the title job's", got)
+	}
+}
+
+// TestFailedPushMakesNoSupplyRun: a push Calendar refused makes no Supply
+// run.
+func TestFailedPushMakesNoSupplyRun(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+
+	if rec, _ := e.push(t, "2026-10-12"); rec.Code != http.StatusConflict {
+		t.Fatalf("push unconnected = %d %s", rec.Code, rec.Body)
+	}
+	if status, body := callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", nil); status != http.StatusNotFound {
+		t.Errorf("GET after a failed push = %d %v, want 404", status, body)
+	}
+}
+
+// TestPushPlanSupplyRunFails: when the Supply run cannot be made after the
+// push, the push stands (200, synced, on Calendar), the answer says the
+// Supply run failed, the failure is logged as an error, and no Supply run
+// is claimed.
+func TestPushPlanSupplyRunFails(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	if _, err := e.st.Writer.ExecContext(t.Context(), `UPDATE recipe_ingredients SET name = NULL WHERE name = 'onion'`); err != nil {
+		t.Fatal(err)
+	}
+	e.connectCalendar(t, true)
+
+	rec, body := e.push(t, "2026-10-12")
+	if rec.Code != http.StatusOK || body["status"] != "synced" {
+		t.Fatalf("push = %d %s, want 200 synced", rec.Code, rec.Body)
+	}
+	want := map[string]any{"status": "failed", "error": map[string]any{
+		"code":      "supply_run_failed",
+		"message":   "the plan is on Calendar, but its Supply run could not be made; make it again from the Supply run",
+		"retryable": true,
+	}}
+	if !reflect.DeepEqual(body["supply_run"], want) {
+		t.Errorf("supply_run = %v, want %v", body["supply_run"], want)
+	}
+	if n := len(e.google.Events(pushCalendar.ID)); n != 7 {
+		t.Errorf("calendar has %d events, want 7", n)
+	}
+	p, err := e.svc.Get(t.Context(), mustLocalDate(t, "2026-10-12"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if p.Status != plan.StatusSynced {
+		t.Errorf("plan = %s after the push, want synced", p.Status)
+	}
+	if !strings.Contains(e.logs.String(), `"level":"ERROR","msg":"generate Supply run after Push to Calendar"`) ||
+		!strings.Contains(e.logs.String(), "has no normalized name") {
+		t.Errorf("logs = %s, want the failure logged as an error", e.logs)
+	}
+	if status, got := callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", nil); status != http.StatusNotFound {
+		t.Errorf("GET after the failure = %d %v, want 404", status, got)
+	}
+}
+
+// TestPushPlanEditedBeforeSupplyRun: a plan edit landing after the push
+// is recorded but before the Supply run is made does not make the Supply
+// run from the edited plan, which Calendar does not show. The push stands
+// (200, on Calendar) and the answer says the Supply run was not made
+// because the plan changed.
+func TestPushPlanEditedBeforeSupplyRun(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	e.connectCalendar(t, true)
+	// Once the push records Sunday's event, the household swaps Tuesday to
+	// Pad Thai, as a swap does: committed before the Supply run is made.
+	if _, err := e.st.Writer.ExecContext(t.Context(), `CREATE TRIGGER edit_after_push
+		AFTER UPDATE OF calendar_event_id ON plan_days
+		WHEN NEW.date = '2026-10-18' AND NEW.calendar_event_id IS NOT NULL
+		BEGIN
+			UPDATE plan_days SET dinner_id = '`+e.questLog+`', is_new = 1, calendar_event_id = NULL WHERE date = '2026-10-13';
+			UPDATE week_plans SET status = CASE WHEN status = 'synced' THEN 'changed' ELSE status END, revision = revision + 1;
+		END`); err != nil {
+		t.Fatal(err)
+	}
+
+	rec, body := e.push(t, "2026-10-12")
+	if rec.Code != http.StatusOK {
+		t.Fatalf("push = %d %s, want 200", rec.Code, rec.Body)
+	}
+	want := map[string]any{"status": "failed", "error": map[string]any{
+		"code":      "plan_changed",
+		"message":   "the plan is on Calendar as pushed, but it was edited before its Supply run was made, so no Supply run was made from it; push again",
+		"retryable": true,
+	}}
+	if !reflect.DeepEqual(body["supply_run"], want) {
+		t.Errorf("supply_run = %v, want %v", body["supply_run"], want)
+	}
+	if n := len(e.google.Events(pushCalendar.ID)); n != 7 {
+		t.Errorf("calendar has %d events, want 7", n)
+	}
+	if status, got := callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", nil); status != http.StatusNotFound {
+		t.Errorf("GET after the edit = %d %v, want 404: no Supply run from the edited plan", status, got)
+	}
+	if !strings.Contains(e.logs.String(), `"level":"WARN","msg":"plan edited after Push to Calendar; Supply run not made"`) {
+		t.Errorf("logs = %s, want the edit logged as a warning", e.logs)
+	}
+}
+
+// TestPushPlanLeavesArchivedSupplyRun: pushing a week whose Supply run is
+// in the Supply archive leaves it as it was and says so.
+func TestPushPlanLeavesArchivedSupplyRun(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", nil)
+	e.archive(t)
+	if _, err := e.svc.Swap(t.Context(), mustLocalDate(t, "2026-10-12"), "2026-10-13", e.questLog); err != nil {
+		t.Fatal(err)
+	}
+	e.connectCalendar(t, true)
+
+	rec, body := e.push(t, "2026-10-12")
+	if rec.Code != http.StatusOK || body["status"] != "synced" {
+		t.Fatalf("push = %d %s", rec.Code, rec.Body)
+	}
+	run, _ := body["supply_run"].(map[string]any)
+	if apiErr, _ := run["error"].(map[string]any); run["status"] != "archived" || apiErr["code"] != "archived" {
+		t.Errorf("supply_run = %v, want archived", body["supply_run"])
+	}
+	var l supplyRunJSON
+	callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &l)
+	if !reflect.DeepEqual(l.render(), weekLines) {
+		t.Errorf("archived Supply run after push = %v, want unchanged", l.render())
+	}
+}
+
+// archiveJSON is a GET /shopping/archive answer decoded with every field
+// the API promises.
+type archiveJSON struct {
+	By      string `json:"by"`
+	Periods []struct {
+		Key     string `json:"key"`
+		Heading string `json:"heading"`
+		Posts   []struct {
+			WeekStart   string   `json:"weekStart"`
+			Label       string   `json:"label"`
+			Title       *string  `json:"title"`
+			DinnerCount int      `json:"dinnerCount"`
+			ItemCount   int      `json:"itemCount"`
+			OnHandCount int      `json:"onHandCount"`
+			Dinners     []string `json:"dinners"`
+			Current     bool     `json:"current"`
+		} `json:"posts"`
+	} `json:"periods"`
+}
+
+// weekSupplyRun plans a new dinner named name, grounded in a recipe
+// listing ings, on the Monday of the week starting monday, and generates
+// the week's Supply run.
+func (e plansEnv) weekSupplyRun(t *testing.T, monday store.LocalDate, name string, ings ...shopIng) supplyRunJSON {
+	t.Helper()
+	q := db.New(e.st.Writer)
+	now := store.Now().String()
+	d, err := q.CreateDinner(t.Context(), db.CreateDinnerParams{
+		ID: store.NewID(), Name: name, NormalizedName: harness.Normalize(name), Status: "regular", Origin: "regular",
+		GroundingStatus: "manual", CreatedAt: now, UpdatedAt: now,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	planID := store.NewID()
+	if err := q.CreateWeekPlan(t.Context(), db.CreateWeekPlanParams{ID: planID, WeekStart: monday.String(), CreatedAt: now, UpdatedAt: now}); err != nil {
+		t.Fatal(err)
+	}
+	if err := q.PutPlanDay(t.Context(), db.PutPlanDayParams{ID: store.NewID(), PlanID: planID, Date: monday.String(),
+		DinnerID: sql.NullString{String: d.ID, Valid: true}, CreatedAt: now, UpdatedAt: now}); err != nil {
+		t.Fatal(err)
+	}
+	e.groundDay(t, monday.String(), ings...)
+	var l supplyRunJSON
+	if status, body := callShopping(t, e, http.MethodPost, shoppingPath+monday.String()+"/generate", "", &l); status != http.StatusOK {
+		t.Fatalf("generate %s = %d %v", monday, status, body)
+	}
+	return l
+}
+
+// TestSupplyArchive freezes last week's Supply run and reads the Supply
+// archive: posts newest first with exactly the promised fields, this
+// week's marked current. The frozen list is served read-only.
+func TestSupplyArchive(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	// The fixture's plan is for a fixed week; this test plans weeks
+	// around today instead.
+	if _, err := e.st.Writer.ExecContext(t.Context(), `DELETE FROM plan_days; DELETE FROM week_plans`); err != nil {
+		t.Fatal(err)
+	}
+	zone, err := household.LoadZone("America/New_York") // the env's household zone
+	if err != nil {
+		t.Fatal(err)
+	}
+	thisWeek := household.WeekStart(household.Today(time.Now(), zone))
+	y, m, d := thisWeek.Date()
+	lastWeek := store.LocalDateOf(time.Date(y, m, d-7, 0, 0, 0, 0, time.UTC))
+
+	last := e.weekSupplyRun(t, lastWeek, "Beef Stew", shopIng{"stewing beef", "2", "lb"}, shopIng{"carrots", "4", ""}, shopIng{"onion", "1", ""})
+	onion := last.itemID(t, "onion")
+	if status, body := callShopping(t, e, http.MethodPatch, shoppingPath+"items/"+onion, `{"needed":false}`, nil); status != http.StatusOK {
+		t.Fatalf("PATCH = %d %v", status, body)
+	}
+	e.weekSupplyRun(t, thisWeek, "Lemon Chicken", shopIng{"chicken thighs", "6", ""}, shopIng{"lemon", "1", ""})
+	if err := e.shop.Freeze(t.Context(), lastWeek); err != nil {
+		t.Fatal(err)
+	}
+	if err := e.shop.Freeze(t.Context(), thisWeek); !errors.Is(err, shopping.ErrWeekNotEnded) {
+		t.Fatalf("Freeze this week = %v, want ErrWeekNotEnded", err)
+	}
+
+	var got archiveJSON
+	status, raw := callShopping(t, e, http.MethodGet, shoppingPath+"archive?by=week", "", &got)
+	if status != http.StatusOK {
+		t.Fatalf("GET archive = %d %v", status, raw)
+	}
+	if k := keys(raw); !reflect.DeepEqual(k, []string{"by", "periods"}) {
+		t.Errorf("archive fields = %v", k)
+	}
+	period := raw["periods"].([]any)[0].(map[string]any)
+	if k := keys(period); !reflect.DeepEqual(k, []string{"heading", "key", "posts"}) {
+		t.Errorf("period fields = %v", k)
+	}
+	wantPost := []string{"current", "dinnerCount", "dinners", "itemCount", "label", "onHandCount", "title", "weekStart"}
+	if k := keys(period["posts"].([]any)[0].(map[string]any)); !reflect.DeepEqual(k, wantPost) {
+		t.Errorf("post fields = %v, want %v", k, wantPost)
+	}
+	var posts []string
+	for _, p := range got.Periods {
+		if len(p.Posts) != 1 || p.Key != household.PeriodKey(mustLocalDate(t, p.Posts[0].WeekStart)) || p.Heading != p.Posts[0].Label {
+			t.Errorf("period %+v, want one post under its week", p)
+		}
+		for _, post := range p.Posts {
+			label, err := household.WeekLabel(mustLocalDate(t, post.WeekStart))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if post.Label != label || post.Title != nil {
+				t.Errorf("post %s: label %q title %v, want %q and null", post.WeekStart, post.Label, post.Title, label)
+			}
+			posts = append(posts, fmt.Sprintf("%s %d dinners %d items %d on hand %v current=%t",
+				post.WeekStart, post.DinnerCount, post.ItemCount, post.OnHandCount, post.Dinners, post.Current))
+		}
+	}
+	want := []string{
+		thisWeek.String() + " 1 dinners 2 items 0 on hand [Lemon Chicken] current=true",
+		lastWeek.String() + " 1 dinners 3 items 1 on hand [Beef Stew] current=false",
+	}
+	if got.By != "week" || !reflect.DeepEqual(posts, want) {
+		t.Errorf("archive by %s =\n  %s\nwant\n  %s", got.By, strings.Join(posts, "\n  "), strings.Join(want, "\n  "))
+	}
+
+	for _, q := range []string{"", "?by=", "?by=day", "?by=MONTH"} {
+		status, body := callShopping(t, e, http.MethodGet, shoppingPath+"archive"+q, "", nil)
+		if status != http.StatusBadRequest || errorCode(body) != "invalid_request" {
+			t.Errorf("GET archive%s = %d %v, want 400 invalid_request", q, status, body)
+		}
+	}
+
+	status, body := callShopping(t, e, http.MethodPatch, shoppingPath+"items/"+last.itemID(t, "carrots"), `{"needed":false}`, nil)
+	if status != http.StatusConflict || errorCode(body) != "archived" {
+		t.Errorf("PATCH after Freeze = %d %v, want 409 archived", status, body)
+	}
+	var frozen supplyRunJSON
+	if status, body := callShopping(t, e, http.MethodGet, shoppingPath+lastWeek.String(), "", &frozen); status != http.StatusOK {
+		t.Fatalf("GET frozen list = %d %v", status, body)
+	}
+	wantLines := []string{
+		"Monday " + lastWeek.String() + " Beef Stew: stewing beef [2 lb] needed",
+		"Monday " + lastWeek.String() + " Beef Stew: carrots [4] needed",
+		"Monday " + lastWeek.String() + " Beef Stew: onion [1] have it",
+	}
+	if frozen.Status != "archived" || frozen.NeededCount != 2 || frozen.TotalCount != 3 || !reflect.DeepEqual(frozen.render(), wantLines) {
+		t.Errorf("frozen list = %s %d/%d %v, want archived 2/3 %v", frozen.Status, frozen.NeededCount, frozen.TotalCount, frozen.render(), wantLines)
+	}
+}

internal/server/suggestions_test.go

@@ -45,7 +45,7 @@ func newSuggestionsRouter(t *testing.T, names ...string) (http.Handler, *store.S
 		t.Fatal(err)
 	}
 	h, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t),
-		newTestDinners(t), svc, newTestPlan(t), newTestGoogle(t), runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestDinners(t), svc, newTestPlan(t), newTestShopping(t), newTestGoogle(t), runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/shopping/archive.go

@@ -0,0 +1,232 @@
+package shopping
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"strconv"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+// Archive groupings: the period Archive groups its posts by.
+const (
+	ByWeek  = "week"
+	ByMonth = "month"
+	ByYear  = "year"
+)
+
+// Freeze moves the Supply run of the week starting weekStart into the
+// Supply archive: its status becomes archived and frozen_at is set, after
+// which it is read-only (Generate and SetNeeded are ErrFrozen). Freezing a
+// frozen list does nothing and is no error.
+//
+// The week must have ended in the household's time zone: a week not yet
+// ended is ErrWeekNotEnded, and a week with no Supply run ErrListNotFound.
+//
+// A list still untitled is titled first, with archive_title and the same
+// conditional write as a KindTitleSupplyRun job, from the week's plan as
+// Generate titles it, so its post in the Supply archive gets a title when
+// the AI can write one. Titling never fails the freeze: a title that
+// cannot be written is logged and the list is frozen untitled, when its
+// week label stands in for the title for good. Freeze first waits for the
+// title jobs in flight to store their titles or fail, and holds off new
+// ones until the list is frozen, so a title a job's archive_title run
+// wrote is stored before the freeze, and the freeze runs archive_title
+// only when no job is running it. A job that runs after the freeze finds
+// the list titled, or frozen untitled, and stores nothing.
+func (s *Service) Freeze(ctx context.Context, weekStart store.LocalDate) error {
+	if _, err := household.WeekDays(weekStart); err != nil {
+		return fmt.Errorf("shopping: freeze: %w", err)
+	}
+	q := db.New(s.st.Writer)
+	thisWeek, err := s.thisWeek(ctx, q)
+	if err != nil {
+		return err
+	}
+	if weekStart.String() >= thisWeek.String() {
+		return fmt.Errorf("shopping: freeze %s: %w", weekStart, ErrWeekNotEnded)
+	}
+	s.titling.Lock()
+	defer s.titling.Unlock()
+	list, err := q.GetShoppingList(ctx, weekStart.String())
+	if errors.Is(err, sql.ErrNoRows) {
+		return ErrListNotFound
+	}
+	if err != nil {
+		return fmt.Errorf("shopping: freeze: read list: %w", err)
+	}
+	if frozen(list) {
+		return nil
+	}
+	if !list.Title.Valid {
+		p, err := freezeTitleJob(ctx, q, list)
+		if err != nil {
+			return err
+		}
+		if _, err := s.storeTitle(ctx, p); err != nil {
+			s.logger.WarnContext(ctx, "Supply run frozen untitled; the Supply archive shows its week label",
+				"week", list.WeekStart, "list", list.ID, "error", err)
+		}
+	}
+	// A list frozen meanwhile is left as it is: the freeze is done.
+	now := store.Now().String()
+	if _, err := q.FreezeShoppingList(ctx, db.FreezeShoppingListParams{
+		FrozenAt: sql.NullString{String: now, Valid: true}, UpdatedAt: now, ID: list.ID,
+	}); err != nil {
+		return fmt.Errorf("shopping: freeze %s: %w", weekStart, err)
+	}
+	return nil
+}
+
+// freezeTitleJob is the title job of list as Generate would enqueue it:
+// the week's plan revision and its dinners in day order.
+func freezeTitleJob(ctx context.Context, q *db.Queries, list db.ShoppingList) (TitleJob, error) {
+	plan, err := q.GetWeekPlan(ctx, list.WeekStart)
+	if err != nil {
+		return TitleJob{}, fmt.Errorf("shopping: freeze: read plan: %w", err)
+	}
+	days, err := q.ListPlanDays(ctx, plan.ID)
+	if err != nil {
+		return TitleJob{}, fmt.Errorf("shopping: freeze: read plan days: %w", err)
+	}
+	names := make([]string, len(days))
+	for i, d := range days {
+		names[i] = d.Dinner.Name
+	}
+	return TitleJob{ListID: list.ID, WeekStart: list.WeekStart, Revision: plan.Revision, Dinners: names}, nil
+}
+
+// thisWeek returns the Monday of the household's current week, in its
+// time zone, by the service's clock.
+func (s *Service) thisWeek(ctx context.Context, q *db.Queries) (store.LocalDate, error) {
+	settings, err := q.GetHouseholdSettings(ctx)
+	if err != nil {
+		return store.LocalDate{}, fmt.Errorf("shopping: read household settings: %w", err)
+	}
+	zone, err := household.LoadZone(settings.Timezone)
+	if err != nil {
+		return store.LocalDate{}, fmt.Errorf("shopping: household settings: %w", err)
+	}
+	return household.WeekStart(household.Today(s.now(), zone)), nil
+}
+
+// Period is one heading of the Supply archive and its posts, newest first.
+type Period struct {
+	// Key identifies the period: the ISO week ("2026-W41"), the month
+	// ("2026-10") or the year ("2026").
+	Key string
+	// Heading is the period as shown: the week label, the month and year
+	// ("October 2026") or the year ("2026").
+	Heading string
+	Posts   []Post
+}
+
+// Post is one Supply run in the Supply archive.
+type Post struct {
+	WeekStart string
+	// Label is the week label, such as "Week 41 · Oct 5 – 11".
+	Label string
+	// Title is nil while the list is untitled, when Label stands in.
+	Title *string
+	// Dinners are the names of the list's dinners, in day order.
+	Dinners []string
+	// Items is how many items the list has, and OnHand how many of them
+	// the household marked "have it".
+	Items, OnHand int
+	// Current is true for the household's current week.
+	Current bool
+}
+
+// Archive returns the Supply archive: the Supply run of every week up to
+// and including the household's current week, newest first, grouped by
+// by, which is ByWeek, ByMonth or ByYear (else ErrInvalidPeriod). A
+// week's month and year are those of its Monday, a household-local date,
+// so a week belongs to one period whatever the server's zone; the week
+// starting Monday 2026-12-28 is in December 2026.
+func (s *Service) Archive(ctx context.Context, by string) (out []Period, err error) {
+	// period returns the key and heading of the period holding p, whose
+	// week starts on Monday monday.
+	var period func(monday store.LocalDate, p Post) (string, string)
+	switch by {
+	case ByWeek:
+		period = func(monday store.LocalDate, p Post) (string, string) {
+			return household.PeriodKey(monday), p.Label
+		}
+	case ByMonth:
+		period = func(monday store.LocalDate, _ Post) (string, string) {
+			y, m, _ := monday.Date()
+			return fmt.Sprintf("%04d-%02d", y, int(m)), fmt.Sprintf("%s %d", m, y)
+		}
+	case ByYear:
+		period = func(monday store.LocalDate, _ Post) (string, string) {
+			y, _, _ := monday.Date()
+			return strconv.Itoa(y), strconv.Itoa(y)
+		}
+	default:
+		return nil, fmt.Errorf("shopping: archive by %q: %w", by, ErrInvalidPeriod)
+	}
+	tx, err := s.st.Reader.BeginTx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("shopping: begin read: %w", err)
+	}
+	defer func() {
+		err = errors.Join(err, tx.Rollback())
+	}()
+	q := db.New(tx)
+	thisWeek, err := s.thisWeek(ctx, q)
+	if err != nil {
+		return nil, err
+	}
+	lists, err := q.ListShoppingListsThrough(ctx, thisWeek.String())
+	if err != nil {
+		return nil, fmt.Errorf("shopping: read Supply runs: %w", err)
+	}
+	out = []Period{}
+	for _, row := range lists {
+		monday, err := store.ParseLocalDate(row.WeekStart)
+		if err != nil {
+			return nil, fmt.Errorf("shopping: Supply run %s week: %w", row.ID, err)
+		}
+		l, err := readList(ctx, q, row)
+		if err != nil {
+			return nil, err
+		}
+		p, err := postOf(monday, l, monday == thisWeek)
+		if err != nil {
+			return nil, err
+		}
+		k, heading := period(monday, p)
+		if n := len(out); n == 0 || out[n-1].Key != k {
+			out = append(out, Period{Key: k, Heading: heading})
+		}
+		out[len(out)-1].Posts = append(out[len(out)-1].Posts, p)
+	}
+	return out, nil
+}
+
+// postOf is l, the Supply run of the week starting monday, as a post in
+// the Supply archive.
+func postOf(monday store.LocalDate, l List, current bool) (Post, error) {
+	label, err := household.WeekLabel(monday)
+	if err != nil {
+		return Post{}, fmt.Errorf("shopping: Supply run %s: %w", l.ID, err)
+	}
+	dinners := make([]string, len(l.Groups))
+	for i, g := range l.Groups {
+		dinners[i] = g.DinnerName
+	}
+	c := l.Counts()
+	return Post{
+		WeekStart: l.WeekStart,
+		Label:     label,
+		Title:     l.Title,
+		Dinners:   dinners,
+		Items:     c.Total,
+		OnHand:    c.Total - c.Needed,
+		Current:   current,
+	}, nil
+}

internal/shopping/archive_test.go

@@ -0,0 +1,477 @@
+package shopping_test
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"reflect"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+// zoned makes zone the household's time zone and at the instant the
+// service's clock reads.
+func (e *env) zoned(t *testing.T, zone, at string) {
+	t.Helper()
+	if err := household.SeedSettings(t.Context(), e.st, zone); err != nil {
+		t.Fatal(err)
+	}
+	e.at(t, at)
+}
+
+// at sets the service's clock to the RFC 3339 instant at.
+func (e *env) at(t *testing.T, at string) {
+	t.Helper()
+	now, err := time.Parse(time.RFC3339, at)
+	if err != nil {
+		t.Fatal(err)
+	}
+	shopping.SetClock(e.svc, func() time.Time { return now })
+}
+
+// frozenState returns the week's list's status and frozen_at; frozen_at is
+// "" while NULL.
+func (e *env) frozenState(t *testing.T, monday store.LocalDate) (string, string) {
+	t.Helper()
+	var status string
+	var frozenAt sql.NullString
+	if err := e.st.Reader.QueryRow(`SELECT status, frozen_at FROM shopping_lists WHERE week_start = ?`, monday.String()).Scan(&status, &frozenAt); err != nil {
+		t.Fatal(err)
+	}
+	return status, frozenAt.String
+}
+
+// weekList plans the dinners named names on the days of the week starting
+// monday, in order, and generates its Supply run.
+func (e *env) weekList(t *testing.T, monday string, names ...string) shopping.List {
+	t.Helper()
+	start := mustDate(monday)
+	days, err := household.WeekDays(start)
+	if err != nil {
+		t.Fatal(err)
+	}
+	q := db.New(e.st.Writer)
+	now := store.Now().String()
+	planID := store.NewID()
+	if err := q.CreateWeekPlan(t.Context(), db.CreateWeekPlanParams{ID: planID, WeekStart: monday, CreatedAt: now, UpdatedAt: now}); err != nil {
+		t.Fatal(err)
+	}
+	for i, name := range names {
+		if err := q.PutPlanDay(t.Context(), db.PutPlanDayParams{
+			ID: store.NewID(), PlanID: planID, Date: days[i].String(),
+			DinnerID: sql.NullString{String: e.ids[name], Valid: true}, CreatedAt: now, UpdatedAt: now,
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	g, err := e.svc.Generate(t.Context(), start)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return g.List
+}
+
+// endedWeek is the env with the tests' week generated, in New York, on
+// the Monday after it, so the week has ended.
+func endedWeek(t *testing.T) (*env, shopping.List) {
+	t.Helper()
+	e := newEnv(t)
+	e.zoned(t, "America/New_York", "2026-10-19T12:00:00Z")
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"}, ing{"onion", "1", ""})
+	e.plan(t, "Beef Chili")
+	return e, e.generate(t).List
+}
+
+// TestFreeze freezes an ended week's list: it is archived with frozen_at,
+// read back read-only, and freezing it again changes nothing.
+func TestFreeze(t *testing.T) {
+	e, l := endedWeek(t)
+
+	if err := e.svc.Freeze(t.Context(), week); err != nil {
+		t.Fatal(err)
+	}
+	status, frozenAt := e.frozenState(t, week)
+	if status != shopping.StatusArchived || frozenAt == "" {
+		t.Fatalf("after Freeze: status %q, frozen_at %q; want archived and set", status, frozenAt)
+	}
+	got, err := e.svc.Get(t.Context(), week)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.Status != shopping.StatusArchived {
+		t.Errorf("read back status = %q, want archived", got.Status)
+	}
+	wantLines(t, "read back", lines(got), []string{
+		"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed",
+		"0 2026-10-12 Beef Chili: 1 onion [1] needed",
+	})
+
+	time.Sleep(2 * time.Millisecond) // a second freeze would stamp a later frozen_at
+	if err := e.svc.Freeze(t.Context(), week); err != nil {
+		t.Fatalf("second Freeze = %v, want no error", err)
+	}
+	if s, again := e.frozenState(t, week); s != shopping.StatusArchived || again != frozenAt {
+		t.Errorf("after second Freeze: status %q, frozen_at %q; want archived, %q kept", s, again, frozenAt)
+	}
+
+	if _, err := e.svc.SetNeeded(t.Context(), l.Groups[0].Items[1].ID, false); !errors.Is(err, shopping.ErrFrozen) {
+		t.Errorf("SetNeeded after Freeze = %v, want ErrFrozen", err)
+	}
+	if _, err := e.svc.Generate(t.Context(), week); !errors.Is(err, shopping.ErrFrozen) {
+		t.Errorf("Generate after Freeze = %v, want ErrFrozen", err)
+	}
+	wantLines(t, "stored list", e.stored(t), []string{
+		"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed",
+		"0 2026-10-12 Beef Chili: 1 onion [1] needed",
+	})
+}
+
+// TestFreezeWeekNotEnded: a week has not ended until Monday comes in the
+// household's zone. At 23:30 on the Sunday in Los Angeles it is already
+// Monday in UTC, and the list is still not frozen; at 00:05 on the Monday
+// it is.
+func TestFreezeWeekNotEnded(t *testing.T) {
+	e := newEnv(t)
+	e.zoned(t, "America/Los_Angeles", "2026-10-19T06:30:00Z") // Sun 18 Oct 23:30 PDT
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.plan(t, "Beef Chili")
+	e.generate(t)
+
+	if err := e.svc.Freeze(t.Context(), week); !errors.Is(err, shopping.ErrWeekNotEnded) {
+		t.Fatalf("Freeze on the Sunday = %v, want ErrWeekNotEnded", err)
+	}
+	if status, frozenAt := e.frozenState(t, week); status != shopping.StatusCurrent || frozenAt != "" {
+		t.Fatalf("after refused Freeze: status %q, frozen_at %q; want current, unset", status, frozenAt)
+	}
+	if err := e.svc.Freeze(t.Context(), mustDate("2026-10-19")); !errors.Is(err, shopping.ErrWeekNotEnded) {
+		t.Errorf("Freeze of a later week = %v, want ErrWeekNotEnded", err)
+	}
+
+	e.at(t, "2026-10-19T07:05:00Z") // Mon 19 Oct 00:05 PDT
+	if err := e.svc.Freeze(t.Context(), week); err != nil {
+		t.Fatalf("Freeze on the Monday = %v", err)
+	}
+	if status, _ := e.frozenState(t, week); status != shopping.StatusArchived {
+		t.Errorf("status = %q, want archived", status)
+	}
+}
+
+func TestFreezeWeekWithoutList(t *testing.T) {
+	e := newEnv(t)
+	e.zoned(t, "America/New_York", "2026-10-19T12:00:00Z")
+	if err := e.svc.Freeze(t.Context(), week); !errors.Is(err, shopping.ErrListNotFound) {
+		t.Fatalf("Freeze = %v, want ErrListNotFound", err)
+	}
+	if err := e.svc.Freeze(t.Context(), mustDate("2026-10-13")); err == nil {
+		t.Fatal("Freeze of a Tuesday succeeded")
+	}
+}
+
+// TestFreezeTitlesUntitledList: a list still untitled when its week is
+// frozen is titled by archive_title first, from the plan's dinners, and
+// frozen with that title. Its title job, still queued, runs after the
+// freeze, finds the title and succeeds without asking the model again.
+func TestFreezeTitlesUntitledList(t *testing.T) {
+	e := newEnv(t)
+	e.zoned(t, "America/New_York", "2026-10-19T12:00:00Z")
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.dinner(t, "Fish Tacos")
+	e.plan(t, "Fish Tacos", "Beef Chili")
+	g := e.generate(t) // the runner is not started: its title job waits
+	e.model.QueueGenerate(titled("Tacos then Chili"))
+
+	if err := e.svc.Freeze(t.Context(), week); err != nil {
+		t.Fatal(err)
+	}
+	wantTitle(t, "stored title", e.storedTitle(t), "Tacos then Chili")
+	if status, frozenAt := e.frozenState(t, week); status != shopping.StatusArchived || frozenAt == "" {
+		t.Errorf("status %q, frozen_at %q; want archived and set", status, frozenAt)
+	}
+	reqs := e.model.Requests()
+	if len(reqs) != 1 {
+		t.Fatalf("%d model calls, want 1", len(reqs))
+	}
+	if want := "Title the week whose dinners are, in day order from Monday:\n- Fish Tacos\n- Beef Chili"; reqs[0].Messages[0].Content != want {
+		t.Errorf("user message = %q, want %q", reqs[0].Messages[0].Content, want)
+	}
+
+	e.start(t)
+	wantJob(t, e.waitTitle(t, g), jobs.StatusSucceeded, "")
+	if n := len(e.model.Requests()); n != 1 {
+		t.Errorf("%d model calls, want 1: the job finds the list titled", n)
+	}
+	wantTitle(t, "stored title after the job", e.storedTitle(t), "Tacos then Chili")
+}
+
+// pauseTitle makes the env's first archive_title run pause once it has
+// returned, before its title is stored, until the returned release is
+// called or the test ends; paused is closed as it pauses.
+func (e *env) pauseTitle(t *testing.T) (paused <-chan struct{}, release func()) {
+	t.Helper()
+	p, r := make(chan struct{}), make(chan struct{})
+	var first atomic.Bool
+	e.afterTitle = func() {
+		if first.CompareAndSwap(false, true) {
+			close(p)
+			select {
+			case <-r:
+			case <-t.Context().Done():
+			}
+		}
+	}
+	var released sync.Once
+	return p, func() { released.Do(func() { close(r) }) }
+}
+
+// waitClosed fails t unless c is closed within 10 seconds.
+func waitClosed(t *testing.T, what string, c <-chan struct{}) {
+	t.Helper()
+	select {
+	case <-c:
+	case <-time.After(10 * time.Second):
+		t.Fatalf("timed out waiting for %s", what)
+	}
+}
+
+// TestFreezeWaitsForTitleJob: a freeze that starts while a title job's
+// archive_title run has returned but its title is not yet stored waits for
+// the job to store it, freezes the list with that title, and asks the
+// model nothing itself.
+func TestFreezeWaitsForTitleJob(t *testing.T) {
+	e := newEnv(t)
+	e.zoned(t, "America/New_York", "2026-10-19T12:00:00Z")
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.plan(t, "Beef Chili")
+	e.model.QueueGenerate(titled("Chili Night"))
+	paused, release := e.pauseTitle(t)
+	e.start(t)
+	g := e.generate(t)
+	waitClosed(t, "the title job's archive_title run", paused)
+
+	froze := make(chan error, 1)
+	go func() { froze <- e.svc.Freeze(context.Background(), week) }()
+	var err error
+	select {
+	case err = <-froze:
+		t.Errorf("Freeze = %v before the title job stored its title, want it to wait", err)
+		release()
+	case <-time.After(time.Second):
+		release()
+		err = <-froze
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	wantJob(t, e.waitTitle(t, g), jobs.StatusSucceeded, "")
+	wantTitle(t, "stored title", e.storedTitle(t), "Chili Night")
+	if status, _ := e.frozenState(t, week); status != shopping.StatusArchived {
+		t.Errorf("status = %q, want archived", status)
+	}
+	if n := len(e.model.Requests()); n != 1 {
+		t.Errorf("%d model calls, want 1: the freeze waits for the job's title", n)
+	}
+}
+
+// TestTitleJobWaitsForFreeze: a title job that starts while a freeze's
+// archive_title run has returned but its title is not yet stored waits for
+// the freeze, then finds the list titled and asks the model nothing.
+func TestTitleJobWaitsForFreeze(t *testing.T) {
+	e := newEnv(t)
+	e.zoned(t, "America/New_York", "2026-10-19T12:00:00Z")
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.plan(t, "Beef Chili")
+	e.model.QueueGenerate(titled("Chili Night"))
+	g := e.generate(t) // the runner is not started: its title job waits
+	paused, release := e.pauseTitle(t)
+
+	froze := make(chan error, 1)
+	go func() { froze <- e.svc.Freeze(context.Background(), week) }()
+	waitClosed(t, "the freeze's archive_title run", paused)
+	e.start(t)
+	deadline := time.Now().Add(10 * time.Second)
+	for {
+		job, err := e.runner.Get(t.Context(), *g.TitleJobID)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if job.Status == jobs.StatusRunning {
+			break
+		}
+		if job.Status != jobs.StatusQueued || time.Now().After(deadline) {
+			t.Fatalf("title job %s, want it running while the freeze is paused", job.Status)
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+	release()
+	if err := <-froze; err != nil {
+		t.Fatal(err)
+	}
+
+	wantJob(t, e.waitTitle(t, g), jobs.StatusSucceeded, "")
+	wantTitle(t, "stored title", e.storedTitle(t), "Chili Night")
+	if status, _ := e.frozenState(t, week); status != shopping.StatusArchived {
+		t.Errorf("status = %q, want archived", status)
+	}
+	if n := len(e.model.Requests()); n != 1 {
+		t.Errorf("%d model calls, want 1: the job waits for the freeze's title", n)
+	}
+}
+
+// TestFreezeUntitledWhenTitleFails: when archive_title cannot title the
+// list, it is frozen untitled all the same, the failure is logged, and the
+// Supply archive shows its week label for good.
+func TestFreezeUntitledWhenTitleFails(t *testing.T) {
+	e, _ := endedWeek(t) // nothing queued on the model: archive_title fails
+
+	if err := e.svc.Freeze(t.Context(), week); err != nil {
+		t.Fatal(err)
+	}
+	wantUntitled(t, "stored title", e.storedTitle(t))
+	if status, _ := e.frozenState(t, week); status != shopping.StatusArchived {
+		t.Errorf("status = %q, want archived", status)
+	}
+	if !strings.Contains(e.log.String(), "Supply run frozen untitled") {
+		t.Errorf("log lacks the failure:\n%s", e.log.String())
+	}
+	periods, err := e.svc.Archive(t.Context(), shopping.ByWeek)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(periods) != 1 || len(periods[0].Posts) != 1 || periods[0].Posts[0].Title != nil ||
+		periods[0].Posts[0].Label != "Week 42 · Oct 12 – 18" {
+		t.Errorf("archive = %+v, want the untitled week under its label", periods)
+	}
+}
+
+// TestFreezeKeepsTitle: a titled list is frozen with its title and the
+// model is not asked again.
+func TestFreezeKeepsTitle(t *testing.T) {
+	e, _ := endedWeek(t)
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET title = 'Chili Night'`); err != nil {
+		t.Fatal(err)
+	}
+	if err := e.svc.Freeze(t.Context(), week); err != nil {
+		t.Fatal(err)
+	}
+	wantTitle(t, "stored title", e.storedTitle(t), "Chili Night")
+	if n := len(e.model.Requests()); n != 0 {
+		t.Errorf("%d model calls, want none", n)
+	}
+}
+
+// postLine renders p as "weekStart label | title | dinners | items/on hand
+// | current".
+func postLine(p shopping.Post) string {
+	title := "-"
+	if p.Title != nil {
+		title = *p.Title
+	}
+	cur := ""
+	if p.Current {
+		cur = " | current"
+	}
+	return p.WeekStart + " " + p.Label + " | " + title + " | " + strings.Join(p.Dinners, ", ") + " | " +
+		strconv.Itoa(p.Items) + " items, " + strconv.Itoa(p.OnHand) + " on hand" + cur
+}
+
+// periodLines renders periods one line per heading and post.
+func periodLines(periods []shopping.Period) []string {
+	var out []string
+	for _, p := range periods {
+		out = append(out, "# "+p.Key+" "+p.Heading)
+		for _, post := range p.Posts {
+			out = append(out, postLine(post))
+		}
+	}
+	return out
+}
+
+// TestArchiveGroups reads the Supply archive across a month and a year
+// boundary in Auckland, where it is already Monday 4 January 2027 while
+// UTC still reads Sunday 3 January: that week is current, the next one is
+// not yet in the archive, and each week falls in the month and year of
+// its Monday.
+func TestArchiveGroups(t *testing.T) {
+	e := newEnv(t)
+	e.zoned(t, "Pacific/Auckland", "2027-01-03T12:00:00Z") // Mon 4 Jan 2027 01:00 NZDT
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"}, ing{"onion", "1", ""}, ing{"kidney beans", "2", "cans"})
+	e.dinner(t, "Pad Thai", ing{"rice noodles", "8", "oz"}, ing{"lime", "2", ""})
+	e.dinner(t, "Fish Tacos") // no recipe: no group, not counted
+	e.dinner(t, "Pot Roast", ing{"carrots", "4", ""})
+
+	nov := e.weekList(t, "2026-11-30", "Pot Roast") // Nov 30 – Dec 6
+	e.weekList(t, "2026-12-07", "Pad Thai", "Fish Tacos")
+	dec := e.weekList(t, "2026-12-28", "Beef Chili", "Fish Tacos", "Pad Thai") // ISO 2026-W53, into January
+	jan := e.weekList(t, "2027-01-04", "Pad Thai", "Beef Chili")
+	e.weekList(t, "2027-01-11", "Pot Roast") // next week: not in the archive yet
+	e.haveIt(t, dec, "Beef Chili", "onion")
+	e.haveIt(t, dec, "Pad Thai", "lime")
+	e.haveIt(t, jan, "Pad Thai", "lime")
+	e.haveIt(t, nov, "Pot Roast", "carrots")
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET title = 'Chili, Noodles & Co' WHERE week_start = '2026-12-28'`); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2027-01-03T11:05:00.000Z' WHERE week_start < '2027-01-04'`); err != nil {
+		t.Fatal(err)
+	}
+
+	posts := map[string]string{
+		"jan": "2027-01-04 Week 1 · Jan 4 – 10 | - | Pad Thai, Beef Chili | 5 items, 1 on hand | current",
+		"dec": "2026-12-28 Week 53 · Dec 28 – Jan 3 | Chili, Noodles & Co | Beef Chili, Pad Thai | 5 items, 2 on hand",
+		"d07": "2026-12-07 Week 50 · Dec 7 – 13 | - | Pad Thai | 2 items, 0 on hand",
+		"nov": "2026-11-30 Week 49 · Nov 30 – Dec 6 | - | Pot Roast | 1 items, 1 on hand",
+	}
+	for _, tc := range []struct {
+		by   string
+		want []string
+	}{
+		{shopping.ByWeek, []string{
+			"# 2027-W01 Week 1 · Jan 4 – 10", posts["jan"],
+			"# 2026-W53 Week 53 · Dec 28 – Jan 3", posts["dec"],
+			"# 2026-W50 Week 50 · Dec 7 – 13", posts["d07"],
+			"# 2026-W49 Week 49 · Nov 30 – Dec 6", posts["nov"],
+		}},
+		{shopping.ByMonth, []string{
+			"# 2027-01 January 2027", posts["jan"],
+			"# 2026-12 December 2026", posts["dec"], posts["d07"],
+			"# 2026-11 November 2026", posts["nov"],
+		}},
+		{shopping.ByYear, []string{
+			"# 2027 2027", posts["jan"],
+			"# 2026 2026", posts["dec"], posts["d07"], posts["nov"],
+		}},
+	} {
+		got, err := e.svc.Archive(t.Context(), tc.by)
+		if err != nil {
+			t.Fatalf("Archive(%s): %v", tc.by, err)
+		}
+		if lines := periodLines(got); !reflect.DeepEqual(lines, tc.want) {
+			t.Errorf("Archive(%s) =\n  %s\nwant\n  %s", tc.by, strings.Join(lines, "\n  "), strings.Join(tc.want, "\n  "))
+		}
+	}
+}
+
+func TestArchiveEmptyAndInvalidPeriod(t *testing.T) {
+	e := newEnv(t)
+	e.zoned(t, "America/New_York", "2026-10-19T12:00:00Z")
+	got, err := e.svc.Archive(t.Context(), shopping.ByMonth)
+	if err != nil || got == nil || len(got) != 0 {
+		t.Errorf("Archive of no Supply runs = %#v, %v; want empty", got, err)
+	}
+	for _, by := range []string{"", "day", "Week", "months"} {
+		if _, err := e.svc.Archive(t.Context(), by); !errors.Is(err, shopping.ErrInvalidPeriod) {
+			t.Errorf("Archive(%q) = %v, want ErrInvalidPeriod", by, err)
+		}
+	}
+}

internal/shopping/export_test.go

@@ -0,0 +1,6 @@
+package shopping
+
+import "time"
+
+// SetClock makes now the clock s ends and dates weeks on.
+func SetClock(s *Service, now func() time.Time) { s.now = now }

internal/shopping/shopping.go

@@ -0,0 +1,732 @@
+// Package shopping keeps the household's Supply runs: each week's
+// shopping list, generated from the week's plan and grouped by dinner, and
+// the Supply archive they are frozen into.
+//
+// Generate makes a week's Supply run from its plan, and remakes it after
+// the plan changes. It is deterministic and runs no model: an item is one
+// ingredient of the dinner's recipe exactly as recipe grounding stored it
+// (see Generate). The one model call is the Supply run's title, written by
+// archive_title in a KindTitleSupplyRun job when the list is generated
+// untitled (see Generate).
+//
+// Freeze moves a week's Supply run into the Supply archive once its week
+// has ended, and Archive reads the archive back as posts grouped by week,
+// month or year.
+package shopping
+
+import (
+	"context"
+	"crypto/sha256"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log/slog"
+	"strings"
+	"sync"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/skills"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/dinners"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+// List statuses (the shopping_lists.status column).
+const (
+	StatusCurrent  = "current"
+	StatusArchived = "archived"
+)
+
+// Reasons a plan day has no group on its Supply run.
+const (
+	// SkipNoRecipe: the day's dinner has no recipe, as while its grounding
+	// is pending or after it failed.
+	SkipNoRecipe = "no_recipe"
+	// SkipNoIngredients: the day's dinner's recipe lists no ingredients.
+	SkipNoIngredients = "no_ingredients"
+)
+
+// KindTitleSupplyRun is the job kind that titles a Supply run with
+// archive_title. Only Generate and GeneratePushed enqueue it.
+const KindTitleSupplyRun = "title_supply_run"
+
+// ReasonTitleFailed is the failure code of a KindTitleSupplyRun job that
+// stored no title: archive_title failed, or the Supply run was frozen or
+// replaced first. The Supply run stays untitled.
+const ReasonTitleFailed = "title_failed"
+
+// ErrPlanNotFound is a generation for a week with no plan.
+var ErrPlanNotFound = errors.New("the week has no plan")
+
+// ErrPlanChanged is a generation from a pushed plan the household has
+// edited since it was pushed: the Supply run would not match Calendar, so
+// none is made, and pushing the plan again makes it.
+var ErrPlanChanged = errors.New("the plan changed after it was pushed to Calendar; push again")
+
+// ErrFrozen is a generation of, or a change to an item of, a Supply run
+// frozen into the Supply archive, which is read-only.
+var ErrFrozen = errors.New("the week's Supply run is in the Supply archive and can no longer change")
+
+// ErrListNotFound is a read of a week with no Supply run.
+var ErrListNotFound = errors.New("the week has no Supply run")
+
+// ErrItemNotFound is a change to an item on no Supply run.
+var ErrItemNotFound = errors.New("no Supply run has that item")
+
+// ErrWeekNotEnded is a freeze of a Supply run whose week has not ended in
+// the household's time zone.
+var ErrWeekNotEnded = errors.New("the week has not ended")
+
+// ErrInvalidPeriod is an Archive grouping other than ByWeek, ByMonth and
+// ByYear.
+var ErrInvalidPeriod = errors.New("by must be week, month or year")
+
+// Titler runs archive_title on in; scope names the week, its plan revision
+// and its dinners.
+// In production it is skills.TitleArchive with the household's
+// harness.Config.
+type Titler func(ctx context.Context, scope string, in skills.ArchiveTitleRequest) (skills.ArchiveTitle, error)
+
+// Service generates Supply runs.
+type Service struct {
+	st       *store.Store
+	title    Titler
+	titleJob *jobs.Kind[TitleJob]
+	logger   *slog.Logger
+	// now is the clock weeks are ended and current on; tests replace it.
+	now func() time.Time
+	// titling orders the title writes against Freeze. A title job holds it
+	// shared from reading the list to storing its title, and Freeze holds
+	// it exclusively from reading the list to freezing it, so a freeze
+	// waits for the title jobs in flight to store their titles or fail,
+	// and no title job runs archive_title while a freeze is under way.
+	titling sync.RWMutex
+}
+
+// NewService returns a service over st that titles Supply runs with title
+// in KindTitleSupplyRun jobs, which it registers on runner, and logs to
+// logger. runner must not have started yet.
+func NewService(st *store.Store, title Titler, runner *jobs.Runner, logger *slog.Logger) (*Service, error) {
+	switch {
+	case st == nil:
+		return nil, errors.New("shopping: nil store")
+	case title == nil:
+		return nil, errors.New("shopping: nil titler")
+	case runner == nil:
+		return nil, errors.New("shopping: nil job runner")
+	case logger == nil:
+		return nil, errors.New("shopping: nil logger")
+	}
+	s := &Service{st: st, title: title, logger: logger, now: time.Now}
+	kind, err := jobs.Register(runner, KindTitleSupplyRun, s.runTitleJob, ReasonTitleFailed)
+	if err != nil {
+		return nil, err
+	}
+	if err := kind.ServiceOnly(); err != nil {
+		return nil, err
+	}
+	s.titleJob = kind
+	return s, nil
+}
+
+// List is a Supply run.
+type List struct {
+	ID string `json:"id"`
+	// WeekStart is the Monday of the list's week, YYYY-MM-DD.
+	WeekStart string `json:"week_start"`
+	PlanID    string `json:"plan_id"`
+	// Title is the AI-written post title; nil until it is written, when
+	// the week label stands in for it.
+	Title  *string `json:"title"`
+	Status string  `json:"status"`
+	// SentToChatAt is when the list was sent to Google Chat; nil until it
+	// is.
+	SentToChatAt *string `json:"sent_to_chat_at"`
+	Groups       []Group `json:"groups"`
+}
+
+// Counts are how many items of a Supply run are still needed and how many
+// it has in all.
+type Counts struct {
+	Needed int `json:"needed_count"`
+	Total  int `json:"total_count"`
+}
+
+// Counts counts l's items.
+func (l List) Counts() Counts {
+	var c Counts
+	for _, g := range l.Groups {
+		for _, it := range g.Items {
+			c.Total++
+			if it.Needed {
+				c.Needed++
+			}
+		}
+	}
+	return c
+}
+
+// Group is the items of one plan day's dinner.
+type Group struct {
+	ID         string `json:"id"`
+	DinnerID   string `json:"dinner_id"`
+	DinnerName string `json:"dinner_name"`
+	// Date is the plan day, household-local YYYY-MM-DD.
+	Date     string `json:"date"`
+	Position int    `json:"position"`
+	Items    []Item `json:"items"`
+}
+
+// Item is one ingredient to buy.
+type Item struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+	// Qty is the quantity as shown, such as "2 cups" or "500 g"; nil when
+	// the recipe gives none.
+	Qty *string `json:"qty"`
+	// Needed is false once the household marks the item "have it".
+	Needed   bool `json:"needed"`
+	Position int  `json:"position"`
+}
+
+// SkippedDay is a plan day with no group on the list, and why.
+type SkippedDay struct {
+	Date       string `json:"date"`
+	DinnerID   string `json:"dinner_id"`
+	DinnerName string `json:"dinner_name"`
+	// Reason is SkipNoRecipe or SkipNoIngredients.
+	Reason string `json:"reason"`
+}
+
+// Generated is the outcome of Generate.
+type Generated struct {
+	List List `json:"list"`
+	// Skipped are the plan days whose dinner has no ingredients to shop
+	// for, by date.
+	Skipped []SkippedDay `json:"skipped"`
+	// TitleJobID is the KindTitleSupplyRun job titling the list; nil when
+	// the list already has its title.
+	TitleJobID *string `json:"title_job_id"`
+}
+
+// Generate makes the Supply run of the week starting weekStart from the
+// week's plan, creating it untitled the first time and remaking it after
+// that, in one transaction.
+//
+// The list has one group per plan day with a dinner, by date, holding one
+// item per ingredient of the dinner's recipe, by the ingredient's
+// position. A fetched recipe's ingredients are normalized when it is
+// grounded (normalize_recipe): the item is the ingredient's name, and its
+// quantity is qty and unit joined by a space ("2 cups"), either alone when
+// the other is missing, or nil when both are. A recipe entered by hand is
+// stored as typed, unnormalized: each item is its line as typed, with no
+// quantity. A day whose dinner has no recipe or whose recipe has no
+// ingredients gets no group and is reported in Skipped.
+//
+// Remaking keeps what the household marked: an item is the same item as
+// before when its dinner and name are the same, wherever the dinner and
+// the ingredient now are, so it keeps its id and needed flag. When a
+// dinner lists a name more than once, its first such item matches the
+// first one before, the second the second, and so on. Any other item is
+// new and needed; an item no longer on the plan is removed, and with it a
+// group no longer on the plan.
+//
+// A list still untitled once it is stored, as a new list always is, gets a
+// KindTitleSupplyRun job, enqueued in the same transaction, that titles it
+// with archive_title from the names of the plan's dinners in day order.
+// Generate returns without waiting for the job: the list is returned
+// untitled, with the job's id. A title is written once: a remake keeps it
+// and enqueues no job. Titling never fails the generation: a title that
+// cannot be written leaves the list untitled, the failure is logged and
+// the job failed with ReasonTitleFailed, and the next generation of the
+// week, Generate or GeneratePushed, tries again.
+//
+// A week with no plan is ErrPlanNotFound; a list frozen into the Supply
+// archive is ErrFrozen. A fetched recipe's ingredient without a name is an
+// error: grounding always names one.
+func (s *Service) Generate(ctx context.Context, weekStart store.LocalDate) (Generated, error) {
+	return s.generate(ctx, weekStart, func(db.WeekPlan) error { return nil })
+}
+
+// GeneratePushed makes the Supply run of the week starting weekStart as
+// Generate does, from the plan a Push to Calendar pushed at revision. A
+// plan edited since (another revision) is ErrPlanChanged, and the Supply
+// run is left as it was.
+func (s *Service) GeneratePushed(ctx context.Context, weekStart store.LocalDate, revision int64) (Generated, error) {
+	return s.generate(ctx, weekStart, func(plan db.WeekPlan) error {
+		if plan.Revision != revision {
+			return ErrPlanChanged
+		}
+		return nil
+	})
+}
+
+// generate makes the Supply run of the week starting weekStart from the
+// week's plan, as Generate says, once check accepts that plan, in the same
+// transaction.
+func (s *Service) generate(ctx context.Context, weekStart store.LocalDate, check func(db.WeekPlan) error) (Generated, error) {
+	if _, err := household.WeekDays(weekStart); err != nil {
+		return Generated{}, fmt.Errorf("shopping: generate: %w", err)
+	}
+	var out Generated
+	err := s.st.WithTx(ctx, func(tx *sql.Tx) error {
+		q := db.New(tx)
+		plan, err := q.GetWeekPlan(ctx, weekStart.String())
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrPlanNotFound
+		}
+		if err != nil {
+			return fmt.Errorf("shopping: read plan: %w", err)
+		}
+		if err := check(plan); err != nil {
+			return err
+		}
+		want, skipped, dinnerNames, err := wanted(ctx, q, plan.ID)
+		if err != nil {
+			return err
+		}
+		now := store.Now().String()
+		list, err := q.GetShoppingList(ctx, weekStart.String())
+		if err != nil && !errors.Is(err, sql.ErrNoRows) {
+			return fmt.Errorf("shopping: read list: %w", err)
+		}
+		switch {
+		case err != nil: // no list yet
+			list = db.ShoppingList{ID: store.NewID(), WeekStart: weekStart.String(), PlanID: plan.ID, Status: StatusCurrent}
+			err = q.CreateShoppingList(ctx, db.CreateShoppingListParams{
+				ID: list.ID, WeekStart: list.WeekStart, PlanID: list.PlanID, CreatedAt: now, UpdatedAt: now,
+			})
+		case frozen(list):
+			return ErrFrozen
+		default:
+			list.PlanID = plan.ID
+			err = q.RegenerateShoppingList(ctx, db.RegenerateShoppingListParams{PlanID: plan.ID, UpdatedAt: now, ID: list.ID})
+		}
+		if err != nil {
+			return fmt.Errorf("shopping: store list: %w", err)
+		}
+		groups, err := reconcile(ctx, q, list.ID, want, now)
+		if err != nil {
+			return err
+		}
+		out = Generated{List: listOf(list, groups), Skipped: skipped}
+		if list.Title.Valid {
+			return nil
+		}
+		id, err := s.titleJob.EnqueueTx(ctx, tx, TitleJob{
+			ListID: list.ID, WeekStart: list.WeekStart, Revision: plan.Revision, Dinners: dinnerNames,
+		})
+		if err != nil {
+			return fmt.Errorf("shopping: enqueue title: %w", err)
+		}
+		out.TitleJobID = &id
+		return nil
+	})
+	if err != nil {
+		return Generated{}, err
+	}
+	if out.TitleJobID != nil {
+		s.titleJob.Wake()
+	}
+	return out, nil
+}
+
+// TitleJob is a KindTitleSupplyRun job's payload: the untitled Supply run
+// ListID of the week WeekStart, made from the plan at Revision, whose
+// dinners in day order are Dinners.
+type TitleJob struct {
+	ListID    string   `json:"list_id"`
+	WeekStart string   `json:"week_start"`
+	Revision  int64    `json:"revision"`
+	Dinners   []string `json:"dinners"`
+}
+
+// titleResult is a KindTitleSupplyRun job's result: the Supply run and the
+// title it has.
+type titleResult struct {
+	ListID string `json:"list_id"`
+	Title  string `json:"title"`
+}
+
+// PublicJSON returns the Supply run's id and title.
+func (r titleResult) PublicJSON() ([]byte, error) { return json.Marshal(r) }
+
+// runTitleJob titles the Supply run of p with archive_title and stores the
+// title. A title that cannot be stored leaves the list untitled: the
+// failure is logged and the job fails with ReasonTitleFailed.
+func (s *Service) runTitleJob(ctx context.Context, p TitleJob, _ func(titleResult) error) (titleResult, error) {
+	title, err := s.writeTitle(ctx, p)
+	if err != nil {
+		s.logger.WarnContext(ctx, "Supply run left untitled; its next generation titles it again",
+			"week", p.WeekStart, "list", p.ListID, "error", err)
+		return titleResult{}, &jobs.Failure{Code: ReasonTitleFailed}
+	}
+	return titleResult{ListID: p.ListID, Title: title}, nil
+}
+
+// writeTitle runs archive_title for p's Supply run and stores its title,
+// as storeTitle does, while no freeze is under way: it waits for one to
+// end first, and a freeze waits for it to end.
+func (s *Service) writeTitle(ctx context.Context, p TitleJob) (string, error) {
+	s.titling.RLock()
+	defer s.titling.RUnlock()
+	return s.storeTitle(ctx, p)
+}
+
+// storeTitle runs archive_title for p's Supply run and stores its title.
+// When the list was titled by another job, before this one ran or
+// meanwhile, that title stands and is returned. The caller holds titling.
+func (s *Service) storeTitle(ctx context.Context, p TitleJob) (string, error) {
+	q := db.New(s.st.Writer)
+	title, err := s.currentTitle(ctx, q, p)
+	if err != nil || title != "" {
+		return title, err
+	}
+	out, err := s.title(ctx, titleScope(p), skills.ArchiveTitleRequest{Dinners: p.Dinners})
+	if err != nil {
+		return "", fmt.Errorf("shopping: title: %w", err)
+	}
+	write, cancel := jobs.FinalWriteContext(ctx)
+	defer cancel()
+	n, err := q.SetShoppingListTitle(write, db.SetShoppingListTitleParams{
+		Title: sql.NullString{String: out.Title, Valid: true}, UpdatedAt: store.Now().String(), ID: p.ListID,
+	})
+	if err != nil {
+		return "", fmt.Errorf("shopping: store title: %w", err)
+	}
+	if n == 1 {
+		return out.Title, nil
+	}
+	title, err = s.currentTitle(write, q, p)
+	if err == nil && title == "" {
+		err = errors.New("shopping: store title: the Supply run is still untitled")
+	}
+	return title, err
+}
+
+// currentTitle returns the title of p's Supply run, or "" while it is
+// untitled. A list frozen or replaced untitled is an error: it can no
+// longer be titled.
+func (s *Service) currentTitle(ctx context.Context, q *db.Queries, p TitleJob) (string, error) {
+	list, err := q.GetShoppingList(ctx, p.WeekStart)
+	if err != nil && !errors.Is(err, sql.ErrNoRows) {
+		return "", fmt.Errorf("shopping: title: read list: %w", err)
+	}
+	switch {
+	case err == nil && list.ID == p.ListID && list.Title.Valid:
+		return list.Title.String, nil
+	case err != nil || list.ID != p.ListID || frozen(list):
+		return "", errors.New("shopping: store title: the Supply run was frozen or replaced before its title was stored")
+	}
+	return "", nil
+}
+
+// titleScope is the archive_title scope of p: its week and plan revision,
+// and a fingerprint of its dinners in day order, so runs share a title only
+// when they title the same dinner names. A renamed dinner changes the
+// names but not the plan revision.
+func titleScope(p TitleJob) string {
+	names, _ := json.Marshal(p.Dinners) // a []string always encodes
+	return fmt.Sprintf("%s@%d/%x", p.WeekStart, p.Revision, sha256.Sum256(names))
+}
+
+// Get returns the Supply run of the week starting weekStart, as stored: a
+// week with none is ErrListNotFound.
+func (s *Service) Get(ctx context.Context, weekStart store.LocalDate) (l List, err error) {
+	if _, err := household.WeekDays(weekStart); err != nil {
+		return List{}, fmt.Errorf("shopping: get: %w", err)
+	}
+	tx, err := s.st.Reader.BeginTx(ctx, nil)
+	if err != nil {
+		return List{}, fmt.Errorf("shopping: begin read: %w", err)
+	}
+	defer func() {
+		err = errors.Join(err, tx.Rollback())
+	}()
+	q := db.New(tx)
+	list, err := q.GetShoppingList(ctx, weekStart.String())
+	if errors.Is(err, sql.ErrNoRows) {
+		return List{}, ErrListNotFound
+	}
+	if err != nil {
+		return List{}, fmt.Errorf("shopping: read list: %w", err)
+	}
+	return readList(ctx, q, list)
+}
+
+// readList reads the groups and items of list through q.
+func readList(ctx context.Context, q *db.Queries, list db.ShoppingList) (List, error) {
+	rows, err := q.ListShoppingGroupDinners(ctx, list.ID)
+	if err != nil {
+		return List{}, fmt.Errorf("shopping: read groups of %s: %w", list.WeekStart, err)
+	}
+	items, err := q.ListShoppingItems(ctx, list.ID)
+	if err != nil {
+		return List{}, fmt.Errorf("shopping: read items of %s: %w", list.WeekStart, err)
+	}
+	byGroup := make(map[string][]Item, len(rows))
+	for _, r := range items {
+		it := r.ShoppingItem
+		byGroup[it.GroupID] = append(byGroup[it.GroupID], Item{
+			ID: it.ID, Name: it.Name, Qty: nullString(it.Qty), Needed: it.Needed == 1, Position: int(it.Position),
+		})
+	}
+	groups := make([]Group, 0, len(rows))
+	for _, r := range rows {
+		g := r.ShoppingGroup
+		groups = append(groups, Group{
+			ID: g.ID, DinnerID: g.DinnerID, DinnerName: r.DinnerName, Date: g.Date, Position: int(g.Position),
+			Items: byGroup[g.ID],
+		})
+	}
+	return listOf(list, groups), nil
+}
+
+// SetNeeded marks item itemID needed, or "have it" when needed is false,
+// and returns its Supply run's counts after the change. An item on no
+// Supply run is ErrItemNotFound; one on a list frozen into the Supply
+// archive is ErrFrozen, and is left as it was.
+func (s *Service) SetNeeded(ctx context.Context, itemID string, needed bool) (Counts, error) {
+	var c Counts
+	err := s.st.WithTx(ctx, func(tx *sql.Tx) error {
+		q := db.New(tx)
+		row, err := q.GetShoppingItemList(ctx, itemID)
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrItemNotFound
+		}
+		if err != nil {
+			return fmt.Errorf("shopping: read list of item %s: %w", itemID, err)
+		}
+		if frozen(row.ShoppingList) {
+			return ErrFrozen
+		}
+		flag := int64(0)
+		if needed {
+			flag = 1
+		}
+		if err := q.SetShoppingItemNeeded(ctx, db.SetShoppingItemNeededParams{
+			Needed: flag, UpdatedAt: store.Now().String(), ID: itemID,
+		}); err != nil {
+			return fmt.Errorf("shopping: mark item %s: %w", itemID, err)
+		}
+		items, err := q.ListShoppingItems(ctx, row.ShoppingList.ID)
+		if err != nil {
+			return fmt.Errorf("shopping: read items: %w", err)
+		}
+		for _, r := range items {
+			c.Total++
+			if r.ShoppingItem.Needed == 1 {
+				c.Needed++
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		return Counts{}, err
+	}
+	return c, nil
+}
+
+// frozen reports whether list is frozen into the Supply archive.
+func frozen(list db.ShoppingList) bool {
+	return list.FrozenAt.Valid || list.Status == StatusArchived
+}
+
+// listOf is list with groups.
+func listOf(list db.ShoppingList, groups []Group) List {
+	return List{
+		ID:           list.ID,
+		WeekStart:    list.WeekStart,
+		PlanID:       list.PlanID,
+		Title:        nullString(list.Title),
+		Status:       list.Status,
+		SentToChatAt: nullString(list.SentToChatAt),
+		Groups:       groups,
+	}
+}
+
+// wantGroup is a group the plan asks for, before it is stored.
+type wantGroup struct {
+	date, dinnerID, dinnerName string
+	items                      []wantItem
+}
+
+type wantItem struct {
+	name string
+	qty  sql.NullString
+}
+
+// wanted reads plan planID's days and their dinners' ingredients: the
+// groups the list must have, by date, the days that get none, and the
+// names of the plan's dinners in day order.
+func wanted(ctx context.Context, q *db.Queries, planID string) ([]wantGroup, []SkippedDay, []string, error) {
+	days, err := q.ListPlanDays(ctx, planID)
+	if err != nil {
+		return nil, nil, nil, fmt.Errorf("shopping: read plan days: %w", err)
+	}
+	var (
+		groups  []wantGroup
+		skipped []SkippedDay
+		names   []string
+	)
+	for _, day := range days {
+		d := day.Dinner
+		names = append(names, d.Name)
+		skip := SkippedDay{Date: day.Date, DinnerID: d.ID, DinnerName: d.Name}
+		if !d.RecipeID.Valid {
+			skip.Reason = SkipNoRecipe
+			skipped = append(skipped, skip)
+			continue
+		}
+		recipe, err := q.GetRecipe(ctx, d.RecipeID.String)
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("shopping: read recipe %s of dinner %s: %w", d.RecipeID.String, d.ID, err)
+		}
+		ings, err := q.ListRecipeIngredients(ctx, recipe.ID)
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("shopping: read ingredients of recipe %s: %w", recipe.ID, err)
+		}
+		if len(ings) == 0 {
+			skip.Reason = SkipNoIngredients
+			skipped = append(skipped, skip)
+			continue
+		}
+		manual := dinners.IsManualRecipe(recipe.SourceUrl)
+		g := wantGroup{date: day.Date, dinnerID: d.ID, dinnerName: d.Name}
+		for _, ing := range ings {
+			it, err := item(ing, manual)
+			if err != nil {
+				return nil, nil, nil, fmt.Errorf("shopping: recipe %s: %w", recipe.ID, err)
+			}
+			g.items = append(g.items, it)
+		}
+		groups = append(groups, g)
+	}
+	return groups, skipped, names, nil
+}
+
+// item is the item for ingredient ing of a recipe entered by hand
+// (manual) or fetched.
+func item(ing db.RecipeIngredient, manual bool) (wantItem, error) {
+	if manual {
+		return wantItem{name: ing.RawText}, nil
+	}
+	if !ing.Name.Valid || ing.Name.String == "" {
+		return wantItem{}, fmt.Errorf("ingredient %d (%q) has no normalized name", ing.Position+1, ing.RawText)
+	}
+	var parts []string
+	for _, p := range []sql.NullString{ing.Qty, ing.Unit} {
+		if p.Valid && p.String != "" {
+			parts = append(parts, p.String)
+		}
+	}
+	qty := strings.Join(parts, " ")
+	return wantItem{name: ing.Name.String, qty: sql.NullString{String: qty, Valid: qty != ""}}, nil
+}
+
+// itemKey is what makes an item the same item across a remake.
+type itemKey struct {
+	dinnerID, name string
+}
+
+// groupKey is what makes a group the same group across a remake.
+type groupKey struct {
+	date, dinnerID string
+}
+
+// reconcile makes the groups and items of list listID those of want, as
+// Generate says, and returns them.
+func reconcile(ctx context.Context, q *db.Queries, listID string, want []wantGroup, now string) ([]Group, error) {
+	oldGroups, err := q.ListShoppingGroups(ctx, listID)
+	if err != nil {
+		return nil, fmt.Errorf("shopping: read groups: %w", err)
+	}
+	oldItems, err := q.ListShoppingItems(ctx, listID)
+	if err != nil {
+		return nil, fmt.Errorf("shopping: read items: %w", err)
+	}
+	groupsByKey := make(map[groupKey]db.ShoppingGroup, len(oldGroups))
+	for _, g := range oldGroups {
+		groupsByKey[groupKey{g.Date, g.DinnerID}] = g
+	}
+	// itemsByKey holds each key's items in list order, so the nth item a
+	// dinner lists under a name matches its nth one before.
+	itemsByKey := make(map[itemKey][]db.ShoppingItem)
+	for _, r := range oldItems {
+		k := itemKey{r.DinnerID, r.ShoppingItem.Name}
+		itemsByKey[k] = append(itemsByKey[k], r.ShoppingItem)
+	}
+	kept := make(map[string]bool) // ids of the groups and items kept
+
+	groups := make([]Group, 0, len(want))
+	for gi, w := range want {
+		g := Group{DinnerID: w.dinnerID, DinnerName: w.dinnerName, Date: w.date, Position: gi}
+		if old, ok := groupsByKey[groupKey{w.date, w.dinnerID}]; ok {
+			g.ID = old.ID
+			kept[old.ID] = true
+			if err := q.MoveShoppingGroup(ctx, db.MoveShoppingGroupParams{Position: int64(gi), UpdatedAt: now, ID: g.ID}); err != nil {
+				return nil, fmt.Errorf("shopping: move group %s: %w", g.ID, err)
+			}
+		} else {
+			g.ID = store.NewID()
+			if err := q.CreateShoppingGroup(ctx, db.CreateShoppingGroupParams{
+				ID: g.ID, ListID: listID, DinnerID: w.dinnerID, Date: w.date, Position: int64(gi),
+				CreatedAt: now, UpdatedAt: now,
+			}); err != nil {
+				return nil, fmt.Errorf("shopping: store group of %s: %w", w.date, err)
+			}
+		}
+		for ii, wi := range w.items {
+			it := Item{Name: wi.name, Qty: nullString(wi.qty), Needed: true, Position: ii}
+			k := itemKey{w.dinnerID, wi.name}
+			if same := itemsByKey[k]; len(same) > 0 {
+				old := same[0]
+				itemsByKey[k] = same[1:]
+				it.ID, it.Needed = old.ID, old.Needed == 1
+				kept[old.ID] = true
+				if err := q.MoveShoppingItem(ctx, db.MoveShoppingItemParams{
+					GroupID: g.ID, Qty: wi.qty, Position: int64(ii), UpdatedAt: now, ID: it.ID,
+				}); err != nil {
+					return nil, fmt.Errorf("shopping: move item %s: %w", it.ID, err)
+				}
+			} else {
+				it.ID = store.NewID()
+				if err := q.CreateShoppingItem(ctx, db.CreateShoppingItemParams{
+					ID: it.ID, GroupID: g.ID, Name: wi.name, Qty: wi.qty, Position: int64(ii),
+					CreatedAt: now, UpdatedAt: now,
+				}); err != nil {
+					return nil, fmt.Errorf("shopping: store item %q of %s: %w", wi.name, w.date, err)
+				}
+			}
+			g.Items = append(g.Items, it)
+		}
+		groups = append(groups, g)
+	}
+
+	// Items first: a group is removed only once it is empty.
+	for _, r := range oldItems {
+		if !kept[r.ShoppingItem.ID] {
+			if err := q.DeleteShoppingItem(ctx, r.ShoppingItem.ID); err != nil {
+				return nil, fmt.Errorf("shopping: remove item %s: %w", r.ShoppingItem.ID, err)
+			}
+		}
+	}
+	for _, g := range oldGroups {
+		if !kept[g.ID] {
+			if err := q.DeleteShoppingGroup(ctx, g.ID); err != nil {
+				return nil, fmt.Errorf("shopping: remove group %s: %w", g.ID, err)
+			}
+		}
+	}
+	return groups, nil
+}
+
+func nullString(s sql.NullString) *string {
+	if !s.Valid {
+		return nil
+	}
+	return &s.String
+}

internal/shopping/shopping_test.go

@@ -0,0 +1,823 @@
+package shopping_test
+
+import (
+	"bytes"
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"reflect"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/harness"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/skills"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/dinners"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/recipes/recipestest"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/migrations"
+)
+
+// week is the Monday the tests plan, and weekDates its days.
+var (
+	week      = mustDate("2026-10-12")
+	weekDates = []string{"2026-10-12", "2026-10-13", "2026-10-14", "2026-10-15", "2026-10-16", "2026-10-17", "2026-10-18"}
+)
+
+func mustDate(s string) store.LocalDate {
+	d, err := store.ParseLocalDate(s)
+	if err != nil {
+		panic(err)
+	}
+	return d
+}
+
+type env struct {
+	svc     *shopping.Service
+	st      *store.Store
+	dataDir string
+	planID  string
+	// ids are the dinners' ids by name.
+	ids map[string]string
+	// runner runs the title jobs, two at a time, once start starts it.
+	runner *jobs.Runner
+	// model answers archive_title, which titles the Supply runs; with
+	// nothing queued it fails, and the lists stay untitled.
+	model *llm.Fake
+	// beforeTitle, when set, runs as archive_title is asked for a title.
+	beforeTitle func()
+	// afterTitle, when set, runs once archive_title has returned, before
+	// its title is stored.
+	afterTitle func()
+	// beforeModel, when set, runs as the model is sent a request.
+	beforeModel func(llm.Request)
+	// log holds what the service logged.
+	log *syncBuffer
+}
+
+// syncBuffer is a bytes.Buffer safe for concurrent use.
+type syncBuffer struct {
+	mu  sync.Mutex
+	buf bytes.Buffer
+}
+
+func (b *syncBuffer) Write(p []byte) (int, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.buf.Write(p)
+}
+
+func (b *syncBuffer) String() string {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.buf.String()
+}
+
+func newEnv(t *testing.T) *env {
+	t.Helper()
+	dataDir := t.TempDir()
+	st, err := store.Open(t.Context(), dataDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := st.Close(); err != nil {
+			t.Error(err)
+		}
+	})
+	if err := store.Migrate(t.Context(), st.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+	e := &env{st: st, dataDir: dataDir, ids: map[string]string{}, model: &llm.Fake{}, log: &syncBuffer{}}
+	guard, err := harness.NewGuard(harness.DefaultMaxCalls)
+	if err != nil {
+		t.Fatal(err)
+	}
+	cfg := harness.Config{
+		Settings:    llm.Settings{Provider: "anthropic", Model: "claude-test", Temperature: 0.7},
+		NewProvider: func(llm.Settings, string) (llm.Provider, error) { return hookedModel{e}, nil },
+		Store:       st,
+		Guard:       guard,
+	}
+	title := func(ctx context.Context, scope string, in skills.ArchiveTitleRequest) (skills.ArchiveTitle, error) {
+		if e.beforeTitle != nil {
+			e.beforeTitle()
+		}
+		out, err := skills.TitleArchive(ctx, cfg, scope, in)
+		if e.afterTitle != nil {
+			e.afterTitle()
+		}
+		return out, err
+	}
+	logger := slog.New(slog.NewTextHandler(e.log, nil))
+	e.runner, err = jobs.NewRunner(st, logger, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	e.svc, err = shopping.NewService(st, title, e.runner, logger)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return e
+}
+
+// hookedModel is the env's model, running beforeModel first.
+type hookedModel struct{ e *env }
+
+func (m hookedModel) Generate(ctx context.Context, req llm.Request) (llm.Response, error) {
+	if m.e.beforeModel != nil {
+		m.e.beforeModel(req)
+	}
+	return m.e.model.Generate(ctx, req)
+}
+
+func (m hookedModel) ListModels(ctx context.Context) ([]llm.Model, error) {
+	return m.e.model.ListModels(ctx)
+}
+
+func (m hookedModel) Verify(ctx context.Context) error { return m.e.model.Verify(ctx) }
+
+// start starts the env's job runner, stopping it when the test ends.
+func (e *env) start(t *testing.T) {
+	t.Helper()
+	ctx, cancel := context.WithCancel(context.Background())
+	if err := e.runner.Start(ctx); err != nil {
+		cancel()
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		cancel()
+		e.runner.Wait()
+	})
+}
+
+// waitTitle waits for g's title job to finish and returns it.
+func (e *env) waitTitle(t *testing.T, g shopping.Generated) jobs.Job {
+	t.Helper()
+	if g.TitleJobID == nil {
+		t.Fatal("generation enqueued no title job")
+	}
+	deadline := time.Now().Add(10 * time.Second)
+	for {
+		job, err := e.runner.Get(t.Context(), *g.TitleJobID)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if job.Status == jobs.StatusSucceeded || job.Status == jobs.StatusFailed {
+			return job
+		}
+		if time.Now().After(deadline) {
+			t.Fatalf("title job %s still %s", job.ID, job.Status)
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+}
+
+// ing is a recipe ingredient as recipe grounding stores it: an empty
+// qty or unit is NULL.
+type ing struct {
+	name, qty, unit string
+}
+
+// dinner stores a Regular named name and returns its id. With ings it is
+// grounded in a fetched recipe listing them; with none it has no recipe.
+func (e *env) dinner(t *testing.T, name string, ings ...ing) string {
+	t.Helper()
+	q := db.New(e.st.Writer)
+	now := store.Now().String()
+	var recipeID sql.NullString
+	status := "pending"
+	if ings != nil {
+		recipeID = e.recipe(t, name, ings)
+		status = "grounded"
+	}
+	d, err := q.CreateDinner(t.Context(), db.CreateDinnerParams{
+		ID:              store.NewID(),
+		Name:            name,
+		NormalizedName:  harness.Normalize(name),
+		Status:          "regular",
+		Origin:          "regular",
+		RecipeID:        recipeID,
+		GroundingStatus: status,
+		CreatedAt:       now,
+		UpdatedAt:       now,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	e.ids[name] = d.ID
+	return d.ID
+}
+
+// recipe stores a fetched recipe titled title with ings, as
+// recipes.Grounder stores a normalized page, and returns its id.
+func (e *env) recipe(t *testing.T, title string, ings []ing) sql.NullString {
+	t.Helper()
+	q := db.New(e.st.Writer)
+	now := store.Now().String()
+	r, err := q.UpsertRecipe(t.Context(), db.UpsertRecipeParams{
+		ID:        store.NewID(),
+		SourceUrl: "https://recipes.example/" + strings.ReplaceAll(strings.ToLower(title), " ", "-"),
+		Title:     title,
+		RawJsonld: "{}",
+		FetchedAt: now,
+		CreatedAt: now,
+		UpdatedAt: now,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	e.setIngredients(t, r.ID, ings)
+	return sql.NullString{String: r.ID, Valid: true}
+}
+
+// setIngredients replaces recipe id's ingredients with ings, as a
+// regrounding does.
+func (e *env) setIngredients(t *testing.T, id string, ings []ing) {
+	t.Helper()
+	q := db.New(e.st.Writer)
+	if err := q.DeleteRecipeIngredients(t.Context(), id); err != nil {
+		t.Fatal(err)
+	}
+	now := store.Now().String()
+	for i, in := range ings {
+		qtyUnit := strings.TrimSpace(in.qty + " " + in.unit)
+		if err := q.CreateRecipeIngredient(t.Context(), db.CreateRecipeIngredientParams{
+			ID:        store.NewID(),
+			RecipeID:  id,
+			Position:  int64(i),
+			RawText:   strings.TrimSpace(qtyUnit + " " + in.name),
+			Name:      sql.NullString{String: in.name, Valid: true},
+			Qty:       sql.NullString{String: in.qty, Valid: in.qty != ""},
+			Unit:      sql.NullString{String: in.unit, Valid: in.unit != ""},
+			CreatedAt: now,
+			UpdatedAt: now,
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+// recipeOf returns the id of dinner name's recipe.
+func (e *env) recipeOf(t *testing.T, name string) string {
+	t.Helper()
+	d, err := db.New(e.st.Reader).GetDinner(t.Context(), e.ids[name])
+	if err != nil {
+		t.Fatal(err)
+	}
+	return d.RecipeID.String
+}
+
+// plan stores the week's plan with the dinners named names on weekDates,
+// in order.
+func (e *env) plan(t *testing.T, names ...string) {
+	t.Helper()
+	q := db.New(e.st.Writer)
+	now := store.Now().String()
+	e.planID = store.NewID()
+	if err := q.CreateWeekPlan(t.Context(), db.CreateWeekPlanParams{ID: e.planID, WeekStart: week.String(), CreatedAt: now, UpdatedAt: now}); err != nil {
+		t.Fatal(err)
+	}
+	for i, name := range names {
+		if err := q.PutPlanDay(t.Context(), db.PutPlanDayParams{
+			ID: store.NewID(), PlanID: e.planID, Date: weekDates[i],
+			DinnerID: sql.NullString{String: e.ids[name], Valid: true}, CreatedAt: now, UpdatedAt: now,
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+// swap plans the dinner named name on date, as a swap on the Draft board
+// does.
+func (e *env) swap(t *testing.T, date, name string) {
+	t.Helper()
+	n, err := db.New(e.st.Writer).SwapPlanDay(t.Context(), db.SwapPlanDayParams{
+		DinnerID: sql.NullString{String: e.ids[name], Valid: true}, UpdatedAt: store.Now().String(),
+		PlanID: e.planID, Date: date,
+	})
+	if err != nil || n != 1 {
+		t.Fatalf("swap %s to %s: %d rows, %v", date, name, n, err)
+	}
+}
+
+// haveIt marks the item named name of dinner's group "have it".
+func (e *env) haveIt(t *testing.T, l shopping.List, dinner, name string) string {
+	t.Helper()
+	for _, g := range l.Groups {
+		for _, it := range g.Items {
+			if g.DinnerName == dinner && it.Name == name {
+				if _, err := e.st.Writer.Exec(`UPDATE shopping_items SET needed = 0 WHERE id = ?`, it.ID); err != nil {
+					t.Fatal(err)
+				}
+				return it.ID
+			}
+		}
+	}
+	t.Fatalf("no item %q of %s", name, dinner)
+	return ""
+}
+
+func (e *env) generate(t *testing.T) shopping.Generated {
+	t.Helper()
+	g, err := e.svc.Generate(t.Context(), week)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return g
+}
+
+// lines renders l one item a line as "position date dinner: position
+// name [qty] needed|have it".
+func lines(l shopping.List) []string {
+	var out []string
+	for _, g := range l.Groups {
+		for _, it := range g.Items {
+			qty := "-"
+			if it.Qty != nil {
+				qty = *it.Qty
+			}
+			mark := "needed"
+			if !it.Needed {
+				mark = "have it"
+			}
+			out = append(out, fmt.Sprintf("%d %s %s: %d %s [%s] %s", g.Position, g.Date, g.DinnerName, it.Position, it.Name, qty, mark))
+		}
+	}
+	return out
+}
+
+// stored renders the stored list of the week as lines does, so a test
+// checks the database holds what Generate returned.
+func (e *env) stored(t *testing.T) []string {
+	t.Helper()
+	rows, err := e.st.Reader.Query(`SELECT g.position, g.date, d.name, i.position, i.name, COALESCE(i.qty, '-'), i.needed
+		FROM shopping_lists l
+		JOIN shopping_groups g ON g.list_id = l.id
+		JOIN dinners d ON d.id = g.dinner_id
+		JOIN shopping_items i ON i.group_id = g.id
+		WHERE l.week_start = ?
+		ORDER BY g.position, i.position`, week.String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+	var out []string
+	for rows.Next() {
+		var (
+			gpos, ipos, needed int
+			date, dinner, name string
+			qty                string
+		)
+		if err := rows.Scan(&gpos, &date, &dinner, &ipos, &name, &qty, &needed); err != nil {
+			t.Fatal(err)
+		}
+		mark := "needed"
+		if needed == 0 {
+			mark = "have it"
+		}
+		out = append(out, fmt.Sprintf("%d %s %s: %d %s [%s] %s", gpos, date, dinner, ipos, name, qty, mark))
+	}
+	if err := rows.Err(); err != nil {
+		t.Fatal(err)
+	}
+	return out
+}
+
+// count returns the number of rows in table.
+func (e *env) count(t *testing.T, table string) int {
+	t.Helper()
+	var n int
+	if err := e.st.Reader.QueryRow(`SELECT count(*) FROM ` + table).Scan(&n); err != nil {
+		t.Fatal(err)
+	}
+	return n
+}
+
+func wantLines(t *testing.T, what string, got, want []string) {
+	t.Helper()
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("%s =\n  %s\nwant\n  %s", what, strings.Join(got, "\n  "), strings.Join(want, "\n  "))
+	}
+}
+
+func TestGenerateSevenDayPlan(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"}, ing{"kidney beans", "2", "cans"}, ing{"onion", "1", ""})
+	e.dinner(t, "Pot Roast", ing{"chuck roast", "3", "lb"}, ing{"carrots", "4", ""})
+	e.dinner(t, "Chicken Fajitas", ing{"chicken breast", "500", "g"}, ing{"bell peppers", "3", ""}, ing{"tortillas", "8", ""})
+	e.dinner(t, "Spaghetti Bolognese", ing{"spaghetti", "1", "lb"}, ing{"crushed tomatoes", "28", "oz"})
+	e.dinner(t, "Sheet Pan Salmon", ing{"salmon fillets", "4", ""}, ing{"lemon", "1", ""}, ing{"dill", "", "sprig"})
+	e.dinner(t, "Pad Thai", ing{"rice noodles", "8", "oz"}, ing{"bean sprouts", "2", "cups"}, ing{"salt", "", ""})
+	e.dinner(t, "Shawarma Bowls", ing{"chicken thighs", "2", "lb"}, ing{"pita", "4", ""})
+	e.plan(t, "Beef Chili", "Pot Roast", "Chicken Fajitas", "Spaghetti Bolognese", "Sheet Pan Salmon", "Pad Thai", "Shawarma Bowls")
+
+	g := e.generate(t)
+
+	want := []string{
+		"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed",
+		"0 2026-10-12 Beef Chili: 1 kidney beans [2 cans] needed",
+		"0 2026-10-12 Beef Chili: 2 onion [1] needed",
+		"1 2026-10-13 Pot Roast: 0 chuck roast [3 lb] needed",
+		"1 2026-10-13 Pot Roast: 1 carrots [4] needed",
+		"2 2026-10-14 Chicken Fajitas: 0 chicken breast [500 g] needed",
+		"2 2026-10-14 Chicken Fajitas: 1 bell peppers [3] needed",
+		"2 2026-10-14 Chicken Fajitas: 2 tortillas [8] needed",
+		"3 2026-10-15 Spaghetti Bolognese: 0 spaghetti [1 lb] needed",
+		"3 2026-10-15 Spaghetti Bolognese: 1 crushed tomatoes [28 oz] needed",
+		"4 2026-10-16 Sheet Pan Salmon: 0 salmon fillets [4] needed",
+		"4 2026-10-16 Sheet Pan Salmon: 1 lemon [1] needed",
+		"4 2026-10-16 Sheet Pan Salmon: 2 dill [sprig] needed",
+		"5 2026-10-17 Pad Thai: 0 rice noodles [8 oz] needed",
+		"5 2026-10-17 Pad Thai: 1 bean sprouts [2 cups] needed",
+		"5 2026-10-17 Pad Thai: 2 salt [-] needed",
+		"6 2026-10-18 Shawarma Bowls: 0 chicken thighs [2 lb] needed",
+		"6 2026-10-18 Shawarma Bowls: 1 pita [4] needed",
+	}
+	wantLines(t, "list", lines(g.List), want)
+	wantLines(t, "stored list", e.stored(t), want)
+	if len(g.Skipped) != 0 {
+		t.Errorf("skipped = %+v, want none", g.Skipped)
+	}
+	for _, grp := range g.List.Groups {
+		if grp.DinnerID != e.ids[grp.DinnerName] {
+			t.Errorf("group %s dinner id = %s, want %s", grp.DinnerName, grp.DinnerID, e.ids[grp.DinnerName])
+		}
+	}
+	if g.List.WeekStart != "2026-10-12" || g.List.PlanID != e.planID || g.List.Status != shopping.StatusCurrent || g.List.Title != nil {
+		t.Errorf("list = %+v, want the week's current, untitled list of plan %s", g.List, e.planID)
+	}
+	var title sql.NullString
+	if err := e.st.Reader.QueryRow(`SELECT title FROM shopping_lists WHERE id = ?`, g.List.ID).Scan(&title); err != nil {
+		t.Fatal(err)
+	}
+	if title.Valid {
+		t.Errorf("stored title = %q, want NULL until the AI titles the list", title.String)
+	}
+
+	// Generating again from the same plan changes nothing: same rows, same
+	// ids, no extra rows. The list is still untitled, so it gets another
+	// title job.
+	again := e.generate(t)
+	if again.TitleJobID == nil || g.TitleJobID == nil || *again.TitleJobID == *g.TitleJobID {
+		t.Errorf("title jobs = %v then %v, want one per generation of the untitled list", deref(g.TitleJobID), deref(again.TitleJobID))
+	}
+	again.TitleJobID = g.TitleJobID
+	if !reflect.DeepEqual(again, g) {
+		t.Errorf("second generation =\n %+v\nwant the first\n %+v", again, g)
+	}
+	if n := e.count(t, "shopping_lists"); n != 1 {
+		t.Errorf("%d lists, want 1", n)
+	}
+	if n := e.count(t, "shopping_items"); n != len(want) {
+		t.Errorf("%d items stored, want %d", n, len(want))
+	}
+}
+
+// TestGenerateManualRecipe grounds a dinner with a recipe typed in, through
+// dinners.Service as the household does: its lines are stored unnormalized,
+// so each is an item as typed, with no quantity.
+func TestGenerateManualRecipe(t *testing.T) {
+	e := newEnv(t)
+	model := &llm.Fake{}
+	grounder := recipestest.NewGrounder(t, e.st, e.dataDir, &recipestest.Search{}, &recipestest.Pages{}, &recipestest.Images{}, model)
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	runner, err := jobs.NewRunner(e.st, logger, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dsvc, err := dinners.NewService(e.st, grounder, runner, logger)
+	if err != nil {
+		t.Fatal(err)
+	}
+	e.dinner(t, "Grandma's Goulash")
+	minutes, method := 45, "stovetop"
+	if _, err := dsvc.Ground(t.Context(), e.ids["Grandma's Goulash"], dinners.Fix{Manual: &dinners.ManualRecipe{
+		Ingredients: []string{"2 lb beef chuck", "1 onion, diced", "paprika to taste"},
+		Steps:       []string{"Brown the beef."},
+		Minutes:     &minutes,
+		Method:      &method,
+	}}, "member-1"); err != nil {
+		t.Fatal(err)
+	}
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.plan(t, "Grandma's Goulash", "Beef Chili")
+
+	g := e.generate(t)
+
+	want := []string{
+		"0 2026-10-12 Grandma's Goulash: 0 2 lb beef chuck [-] needed",
+		"0 2026-10-12 Grandma's Goulash: 1 1 onion, diced [-] needed",
+		"0 2026-10-12 Grandma's Goulash: 2 paprika to taste [-] needed",
+		"1 2026-10-13 Beef Chili: 0 ground beef [1 lb] needed",
+	}
+	wantLines(t, "list", lines(g.List), want)
+	wantLines(t, "stored list", e.stored(t), want)
+	if len(g.Skipped) != 0 {
+		t.Errorf("skipped = %+v, want none", g.Skipped)
+	}
+	if reqs := model.Requests(); len(reqs) != 0 {
+		t.Errorf("%d model requests, want none", len(reqs))
+	}
+}
+
+// TestGenerateSkipsDinnersWithoutIngredients plans a dinner with no recipe
+// (its grounding pending) and one whose recipe lists no ingredients: each
+// day gets no group and is reported with why.
+func TestGenerateSkipsDinnersWithoutIngredients(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Mystery Stew")
+	e.dinner(t, "Toast", []ing{}...) // a recipe with no ingredients
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.plan(t, "Mystery Stew", "Toast", "Beef Chili")
+
+	g := e.generate(t)
+
+	want := []string{"0 2026-10-14 Beef Chili: 0 ground beef [1 lb] needed"}
+	wantLines(t, "list", lines(g.List), want)
+	wantLines(t, "stored list", e.stored(t), want)
+	wantSkipped := []shopping.SkippedDay{
+		{Date: "2026-10-12", DinnerID: e.ids["Mystery Stew"], DinnerName: "Mystery Stew", Reason: shopping.SkipNoRecipe},
+		{Date: "2026-10-13", DinnerID: e.ids["Toast"], DinnerName: "Toast", Reason: shopping.SkipNoIngredients},
+	}
+	if !reflect.DeepEqual(g.Skipped, wantSkipped) {
+		t.Errorf("skipped = %+v, want %+v", g.Skipped, wantSkipped)
+	}
+	if n := e.count(t, "shopping_groups"); n != 1 {
+		t.Errorf("%d groups stored, want 1: a skipped day gets no empty group", n)
+	}
+}
+
+// TestGenerateAfterSwapKeepsHaveIt swaps a day to a new dinner and moves a
+// dinner to another day, and regrounds a dinner so its ingredients change
+// order and quantity: an item whose dinner and name are unchanged keeps
+// its id and "have it" wherever it now is; the rest is added as needed or
+// removed.
+func TestGenerateAfterSwapKeepsHaveIt(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"}, ing{"onion", "1", ""}, ing{"kidney beans", "2", "cans"})
+	e.dinner(t, "Chicken Fajitas", ing{"chicken breast", "500", "g"}, ing{"tortillas", "8", ""})
+	e.dinner(t, "Sheet Pan Salmon", ing{"salmon fillets", "4", ""}, ing{"lemon", "1", ""})
+	e.dinner(t, "Pad Thai", ing{"rice noodles", "8", "oz"}, ing{"lime", "2", ""})
+	e.plan(t, "Beef Chili", "Chicken Fajitas", "Sheet Pan Salmon")
+	first := e.generate(t).List
+	onion := e.haveIt(t, first, "Beef Chili", "onion")
+	tortillas := e.haveIt(t, first, "Chicken Fajitas", "tortillas")
+	lemon := e.haveIt(t, first, "Sheet Pan Salmon", "lemon")
+
+	// Tuesday becomes Pad Thai and Fajitas moves to Wednesday, dropping
+	// the Salmon; the Chili is regrounded: onion first, no beans, a
+	// pepper added and more beef.
+	e.swap(t, "2026-10-13", "Pad Thai")
+	e.swap(t, "2026-10-14", "Chicken Fajitas")
+	e.setIngredients(t, e.recipeOf(t, "Beef Chili"), []ing{{"onion", "2", ""}, {"ground beef", "2", "lb"}, {"jalapeño", "1", ""}})
+
+	g := e.generate(t)
+
+	want := []string{
+		"0 2026-10-12 Beef Chili: 0 onion [2] have it",
+		"0 2026-10-12 Beef Chili: 1 ground beef [2 lb] needed",
+		"0 2026-10-12 Beef Chili: 2 jalapeño [1] needed",
+		"1 2026-10-13 Pad Thai: 0 rice noodles [8 oz] needed",
+		"1 2026-10-13 Pad Thai: 1 lime [2] needed",
+		"2 2026-10-14 Chicken Fajitas: 0 chicken breast [500 g] needed",
+		"2 2026-10-14 Chicken Fajitas: 1 tortillas [8] have it",
+	}
+	wantLines(t, "list", lines(g.List), want)
+	wantLines(t, "stored list", e.stored(t), want)
+	ids := map[string]string{}
+	for _, grp := range g.List.Groups {
+		for _, it := range grp.Items {
+			ids[grp.DinnerName+"/"+it.Name] = it.ID
+		}
+	}
+	if ids["Beef Chili/onion"] != onion || ids["Chicken Fajitas/tortillas"] != tortillas {
+		t.Errorf("kept items have ids %s and %s, want %s and %s", ids["Beef Chili/onion"], ids["Chicken Fajitas/tortillas"], onion, tortillas)
+	}
+	var n int
+	if err := e.st.Reader.QueryRow(`SELECT count(*) FROM shopping_items WHERE id = ?`, lemon).Scan(&n); err != nil {
+		t.Fatal(err)
+	}
+	if n != 0 {
+		t.Error("the Salmon's lemon is still stored after the Salmon left the plan")
+	}
+	if got := e.count(t, "shopping_items"); got != len(want) {
+		t.Errorf("%d items stored, want %d", got, len(want))
+	}
+	if got := e.count(t, "shopping_groups"); got != 3 {
+		t.Errorf("%d groups stored, want 3", got)
+	}
+	if g.List.ID != first.ID {
+		t.Errorf("list id = %s, want the first generation's %s", g.List.ID, first.ID)
+	}
+}
+
+// TestGenerateMatchesRepeatedNamesInOrder lists a name twice in one
+// dinner: the second "salt" marked "have it" stays the second.
+func TestGenerateMatchesRepeatedNamesInOrder(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Pasta", ing{"salt", "1", "tbsp"}, ing{"spaghetti", "1", "lb"}, ing{"salt", "", "pinch"})
+	e.plan(t, "Pasta")
+	first := e.generate(t).List
+	second := first.Groups[0].Items[2].ID
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_items SET needed = 0 WHERE id = ?`, second); err != nil {
+		t.Fatal(err)
+	}
+	e.setIngredients(t, e.recipeOf(t, "Pasta"), []ing{{"spaghetti", "1", "lb"}, {"salt", "1", "tbsp"}, {"salt", "", "pinch"}})
+
+	g := e.generate(t)
+
+	wantLines(t, "list", lines(g.List), []string{
+		"0 2026-10-12 Pasta: 0 spaghetti [1 lb] needed",
+		"0 2026-10-12 Pasta: 1 salt [1 tbsp] needed",
+		"0 2026-10-12 Pasta: 2 salt [pinch] have it",
+	})
+	if id := g.List.Groups[0].Items[2].ID; id != second {
+		t.Errorf("second salt id = %s, want %s", id, second)
+	}
+}
+
+func TestGenerateWeekWithoutPlan(t *testing.T) {
+	e := newEnv(t)
+	if _, err := e.svc.Generate(t.Context(), week); !errors.Is(err, shopping.ErrPlanNotFound) {
+		t.Fatalf("Generate = %v, want ErrPlanNotFound", err)
+	}
+	if n := e.count(t, "shopping_lists"); n != 0 {
+		t.Errorf("%d lists stored, want none", n)
+	}
+}
+
+func TestGenerateRefusesNonMonday(t *testing.T) {
+	e := newEnv(t)
+	if _, err := e.svc.Generate(t.Context(), mustDate("2026-10-13")); err == nil {
+		t.Fatal("Generate of a Tuesday succeeded")
+	}
+}
+
+// TestGenerateRefusesFrozenList leaves a list frozen into the Supply
+// archive as it is.
+func TestGenerateRefusesFrozenList(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.dinner(t, "Pad Thai", ing{"rice noodles", "8", "oz"})
+	e.plan(t, "Beef Chili")
+	e.generate(t)
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'`); err != nil {
+		t.Fatal(err)
+	}
+	e.swap(t, "2026-10-12", "Pad Thai")
+
+	if _, err := e.svc.Generate(t.Context(), week); !errors.Is(err, shopping.ErrFrozen) {
+		t.Fatalf("Generate = %v, want ErrFrozen", err)
+	}
+	wantLines(t, "stored list", e.stored(t), []string{"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed"})
+}
+
+// TestGeneratePushedRefusesEditedPlan makes the Supply run of a pushed
+// plan at the revision pushed, then edits the plan: the pushed revision no
+// longer makes one, and the Supply run is left as it was.
+func TestGeneratePushedRefusesEditedPlan(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.dinner(t, "Pad Thai", ing{"rice noodles", "8", "oz"})
+	e.plan(t, "Beef Chili")
+	q := db.New(e.st.Writer)
+	pushed, err := q.GetWeekPlan(t.Context(), week.String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := e.svc.GeneratePushed(t.Context(), week, pushed.Revision); err != nil {
+		t.Fatalf("GeneratePushed at the pushed revision: %v", err)
+	}
+	e.swap(t, "2026-10-12", "Pad Thai")
+	if err := q.MarkWeekPlanEdited(t.Context(), db.MarkWeekPlanEditedParams{UpdatedAt: store.Now().String(), ID: e.planID}); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := e.svc.GeneratePushed(t.Context(), week, pushed.Revision); !errors.Is(err, shopping.ErrPlanChanged) {
+		t.Fatalf("GeneratePushed after an edit = %v, want ErrPlanChanged", err)
+	}
+	wantLines(t, "stored list", e.stored(t), []string{"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed"})
+}
+
+// TestGenerateRefusesUnnamedIngredient: grounding always names a fetched
+// recipe's ingredient, so one without a name is an error, and nothing is
+// stored.
+func TestGenerateRefusesUnnamedIngredient(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"}, ing{"onion", "1", ""})
+	e.plan(t, "Beef Chili")
+	if _, err := e.st.Writer.Exec(`UPDATE recipe_ingredients SET name = NULL WHERE position = 1`); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err := e.svc.Generate(t.Context(), week)
+	if err == nil || !strings.Contains(err.Error(), `ingredient 2 ("1 onion") has no normalized name`) {
+		t.Fatalf("Generate = %v, want the unnamed ingredient refused", err)
+	}
+	if n := e.count(t, "shopping_lists"); n != 0 {
+		t.Errorf("%d lists stored, want none", n)
+	}
+}
+
+// TestGetReadsStoredList reads back what Generate stored, with what the
+// household marked, and counts it.
+func TestGetReadsStoredList(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"}, ing{"onion", "1", ""})
+	e.dinner(t, "Pot Roast", ing{"carrots", "4", ""})
+	e.plan(t, "Beef Chili", "Pot Roast")
+	made := e.generate(t).List
+	e.haveIt(t, made, "Beef Chili", "onion")
+
+	got, err := e.svc.Get(t.Context(), week)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wantLines(t, "read list", lines(got), []string{
+		"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed",
+		"0 2026-10-12 Beef Chili: 1 onion [1] have it",
+		"1 2026-10-13 Pot Roast: 0 carrots [4] needed",
+	})
+	if got.ID != made.ID || got.WeekStart != week.String() || got.Status != shopping.StatusCurrent || got.Title != nil || got.SentToChatAt != nil {
+		t.Errorf("read list = %+v", got)
+	}
+	if c := got.Counts(); c != (shopping.Counts{Needed: 2, Total: 3}) {
+		t.Errorf("Counts = %+v, want 2 of 3", c)
+	}
+}
+
+func TestGetWeekWithoutList(t *testing.T) {
+	e := newEnv(t)
+	if _, err := e.svc.Get(t.Context(), week); !errors.Is(err, shopping.ErrListNotFound) {
+		t.Fatalf("Get = %v, want ErrListNotFound", err)
+	}
+	if _, err := e.svc.Get(t.Context(), mustDate("2026-10-13")); err == nil {
+		t.Fatal("Get of a Tuesday succeeded")
+	}
+}
+
+// TestSetNeeded marks items and returns the counts after each change.
+func TestSetNeeded(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"}, ing{"onion", "1", ""}, ing{"garlic", "2", "cloves"})
+	e.plan(t, "Beef Chili")
+	l := e.generate(t).List
+	onion, garlic := l.Groups[0].Items[1].ID, l.Groups[0].Items[2].ID
+
+	for _, step := range []struct {
+		id     string
+		needed bool
+		want   shopping.Counts
+	}{
+		{onion, false, shopping.Counts{Needed: 2, Total: 3}},
+		{onion, false, shopping.Counts{Needed: 2, Total: 3}},
+		{garlic, false, shopping.Counts{Needed: 1, Total: 3}},
+		{onion, true, shopping.Counts{Needed: 2, Total: 3}},
+	} {
+		c, err := e.svc.SetNeeded(t.Context(), step.id, step.needed)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if c != step.want {
+			t.Errorf("SetNeeded(%s, %v) = %+v, want %+v", step.id, step.needed, c, step.want)
+		}
+	}
+	wantLines(t, "stored list", e.stored(t), []string{
+		"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed",
+		"0 2026-10-12 Beef Chili: 1 onion [1] needed",
+		"0 2026-10-12 Beef Chili: 2 garlic [2 cloves] have it",
+	})
+}
+
+func TestSetNeededUnknownItem(t *testing.T) {
+	e := newEnv(t)
+	if _, err := e.svc.SetNeeded(t.Context(), store.NewID(), false); !errors.Is(err, shopping.ErrItemNotFound) {
+		t.Fatalf("SetNeeded = %v, want ErrItemNotFound", err)
+	}
+}
+
+// TestSetNeededRefusesFrozenList leaves an item of a list in the Supply
+// archive as it was.
+func TestSetNeededRefusesFrozenList(t *testing.T) {
+	e := newEnv(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.plan(t, "Beef Chili")
+	l := e.generate(t).List
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'`); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := e.svc.SetNeeded(t.Context(), l.Groups[0].Items[0].ID, false); !errors.Is(err, shopping.ErrFrozen) {
+		t.Fatalf("SetNeeded = %v, want ErrFrozen", err)
+	}
+	wantLines(t, "stored list", e.stored(t), []string{"0 2026-10-12 Beef Chili: 0 ground beef [1 lb] needed"})
+}

internal/shopping/title_test.go

@@ -0,0 +1,313 @@
+package shopping_test
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"slices"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/harness"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/shopping"
+)
+
+// titled is archive_title's reply giving title.
+func titled(title string) llm.GenerateResult {
+	js := fmt.Sprintf(`{"title":%q}`, title)
+	return llm.GenerateResult{Response: llm.Response{Text: js, JSON: json.RawMessage(js)}}
+}
+
+// titleWeek stores three dinners, one with no recipe, and plans them on
+// the week's first three days; its job runner is started.
+func titleWeek(t *testing.T) *env {
+	t.Helper()
+	e := newEnv(t)
+	e.start(t)
+	e.dinner(t, "Beef Chili", ing{"ground beef", "1", "lb"})
+	e.dinner(t, "Fish Tacos")
+	e.dinner(t, "Pad Thai", ing{"rice noodles", "8", "oz"})
+	e.plan(t, "Pad Thai", "Fish Tacos", "Beef Chili")
+	return e
+}
+
+// storedTitle returns the week's list's stored title; nil when NULL.
+func (e *env) storedTitle(t *testing.T) *string {
+	t.Helper()
+	var title sql.NullString
+	if err := e.st.Reader.QueryRow(`SELECT title FROM shopping_lists WHERE week_start = ?`, week.String()).Scan(&title); err != nil {
+		t.Fatal(err)
+	}
+	if !title.Valid {
+		return nil
+	}
+	return &title.String
+}
+
+// runStatuses returns the status of every archive_title run recorded in
+// ai_runs, oldest first.
+func (e *env) runStatuses(t *testing.T) []string {
+	t.Helper()
+	rows, err := e.st.Reader.Query(`SELECT status FROM ai_runs WHERE skill = 'archive_title' ORDER BY created_at, rowid`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+	var out []string
+	for rows.Next() {
+		var s string
+		if err := rows.Scan(&s); err != nil {
+			t.Fatal(err)
+		}
+		out = append(out, s)
+	}
+	if err := rows.Err(); err != nil {
+		t.Fatal(err)
+	}
+	return out
+}
+
+func wantTitle(t *testing.T, what string, got *string, want string) {
+	t.Helper()
+	if got == nil || *got != want {
+		t.Errorf("%s = %v, want %q", what, deref(got), want)
+	}
+}
+
+func wantUntitled(t *testing.T, what string, got *string) {
+	t.Helper()
+	if got != nil {
+		t.Errorf("%s = %q, want none", what, *got)
+	}
+}
+
+func deref(s *string) any {
+	if s == nil {
+		return nil
+	}
+	return *s
+}
+
+// wantJob fails t unless job ended with status and, when failed, code.
+func wantJob(t *testing.T, job jobs.Job, status jobs.Status, code string) {
+	t.Helper()
+	if job.Status != status || (code != "" && (job.Error == nil || *job.Error != code)) {
+		t.Errorf("title job = %s %v, want %s %s", job.Status, deref(job.Error), status, code)
+	}
+}
+
+// TestGenerateTitlesNewList: a new list is returned untitled with a title
+// job, which titles it by archive_title from the plan's dinners in day
+// order, a dinner with no group included, and stores the title.
+func TestGenerateTitlesNewList(t *testing.T) {
+	e := titleWeek(t)
+	e.model.QueueGenerate(titled("Noodles, Tacos and Chili"))
+
+	g := e.generate(t)
+	wantUntitled(t, "returned title", g.List.Title)
+	job := e.waitTitle(t, g)
+
+	wantJob(t, job, jobs.StatusSucceeded, "")
+	if want := `{"list_id":"` + g.List.ID + `","title":"Noodles, Tacos and Chili"}`; string(job.Result) != want {
+		t.Errorf("job result = %s, want %s", job.Result, want)
+	}
+	wantTitle(t, "stored title", e.storedTitle(t), "Noodles, Tacos and Chili")
+	got, err := e.svc.Get(t.Context(), week)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wantTitle(t, "title read back", got.Title, "Noodles, Tacos and Chili")
+	reqs := e.model.Requests()
+	if len(reqs) != 1 {
+		t.Fatalf("%d model calls, want 1", len(reqs))
+	}
+	want := "Title the week whose dinners are, in day order from Monday:\n- Pad Thai\n- Fish Tacos\n- Beef Chili"
+	if user := reqs[0].Messages[0].Content; user != want {
+		t.Errorf("user message = %q, want %q", user, want)
+	}
+	if s := e.runStatuses(t); len(s) != 1 || s[0] != string(harness.StatusOK) {
+		t.Errorf("archive_title runs = %q, want one ok", s)
+	}
+}
+
+// TestGenerateTitleTooLongRepaired: a title over 48 characters is repaired
+// through the repair turn, and the repaired title is stored, not a
+// truncation of the first.
+func TestGenerateTitleTooLongRepaired(t *testing.T) {
+	e := titleWeek(t)
+	long := "Pad Thai Monday, Fish Taco Tuesday and Chili Wednesday"
+	e.model.QueueGenerate(titled(long), titled("Noodles, Tacos and Chili"))
+
+	wantJob(t, e.waitTitle(t, e.generate(t)), jobs.StatusSucceeded, "")
+
+	wantTitle(t, "stored title", e.storedTitle(t), "Noodles, Tacos and Chili")
+	reqs := e.model.Requests()
+	if len(reqs) != 2 || !strings.Contains(reqs[1].Messages[2].Content, "has 54 characters; shorten it to at most 48") {
+		t.Fatalf("model calls = %+v, want a repair turn asking for a shorter title", reqs)
+	}
+	if s := e.runStatuses(t); len(s) != 1 || s[0] != string(harness.StatusRepaired) {
+		t.Errorf("archive_title runs = %q, want one repaired", s)
+	}
+}
+
+// TestGenerateTitleFailureKeepsList: archive_title giving an emoji twice
+// fails, and the list is still made, whole and untitled, with the failure
+// logged, recorded in ai_runs and failing the title job.
+func TestGenerateTitleFailureKeepsList(t *testing.T) {
+	e := titleWeek(t)
+	e.model.QueueGenerate(titled("Taco Week 🌮"), titled("Taco Week 🌮"))
+
+	g, err := e.svc.Generate(t.Context(), week)
+	if err != nil {
+		t.Fatalf("Generate = %v, want the list made though its title failed", err)
+	}
+
+	want := []string{
+		"0 2026-10-12 Pad Thai: 0 rice noodles [8 oz] needed",
+		"1 2026-10-14 Beef Chili: 0 ground beef [1 lb] needed",
+	}
+	wantLines(t, "list", lines(g.List), want)
+	wantLines(t, "stored list", e.stored(t), want)
+	if len(g.Skipped) != 1 || g.Skipped[0].DinnerName != "Fish Tacos" {
+		t.Errorf("skipped = %+v, want Fish Tacos", g.Skipped)
+	}
+	wantJob(t, e.waitTitle(t, g), jobs.StatusFailed, shopping.ReasonTitleFailed)
+	wantUntitled(t, "returned title", g.List.Title)
+	wantUntitled(t, "stored title", e.storedTitle(t))
+	if g.List.Status != shopping.StatusCurrent {
+		t.Errorf("status = %q, want current", g.List.Status)
+	}
+	log := e.log.String()
+	for _, part := range []string{"level=WARN", "Supply run left untitled", "week=2026-10-12", "has an emoji (U+1F32E)"} {
+		if !strings.Contains(log, part) {
+			t.Errorf("log lacks %q:\n%s", part, log)
+		}
+	}
+	if s := e.runStatuses(t); len(s) != 1 || s[0] != string(harness.StatusBadOutput) {
+		t.Errorf("archive_title runs = %q, want one bad_output", s)
+	}
+}
+
+// TestGenerateRetriesTitle: a list left untitled is titled by the week's
+// next generation, Generate or GeneratePushed; once titled, a remake keeps
+// its title and asks for none.
+func TestGenerateRetriesTitle(t *testing.T) {
+	e := titleWeek(t)
+	e.model.QueueGenerate(llm.GenerateResult{Err: fmt.Errorf("%w: model down", llm.ErrProvider)})
+	first := e.generate(t)
+	wantJob(t, e.waitTitle(t, first), jobs.StatusFailed, shopping.ReasonTitleFailed)
+	wantUntitled(t, "first title", e.storedTitle(t))
+	if !strings.Contains(e.log.String(), "model down") {
+		t.Errorf("log lacks the failure:\n%s", e.log.String())
+	}
+
+	e.model.QueueGenerate(titled("Noodles, Tacos and Chili"))
+	plan, err := db.New(e.st.Reader).GetWeekPlan(t.Context(), week.String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	second, err := e.svc.GeneratePushed(t.Context(), week, plan.Revision)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if second.List.ID != first.List.ID {
+		t.Fatalf("second generation made list %s, want list %s again", second.List.ID, first.List.ID)
+	}
+	wantJob(t, e.waitTitle(t, second), jobs.StatusSucceeded, "")
+	wantTitle(t, "retried title", e.storedTitle(t), "Noodles, Tacos and Chili")
+
+	e.swap(t, "2026-10-12", "Beef Chili")
+	third := e.generate(t)
+	wantTitle(t, "title after a remake", third.List.Title, "Noodles, Tacos and Chili")
+	if third.TitleJobID != nil {
+		t.Errorf("a remake of a titled list enqueued title job %s", *third.TitleJobID)
+	}
+	if n := len(e.model.Requests()); n != 2 {
+		t.Errorf("%d model calls, want 2: a titled list is not titled again", n)
+	}
+}
+
+// TestGenerateTitleNotStoredOnFrozenList: a list frozen into the Supply
+// archive while its title is written keeps no title, and the failure is
+// logged.
+func TestGenerateTitleNotStoredOnFrozenList(t *testing.T) {
+	e := titleWeek(t)
+	e.model.QueueGenerate(titled("Noodles, Tacos and Chili"))
+	e.beforeTitle = func() {
+		if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'`); err != nil {
+			t.Error(err)
+		}
+	}
+
+	wantJob(t, e.waitTitle(t, e.generate(t)), jobs.StatusFailed, shopping.ReasonTitleFailed)
+
+	wantUntitled(t, "stored title", e.storedTitle(t))
+	if !strings.Contains(e.log.String(), "the Supply run was frozen or replaced before its title was stored") {
+		t.Errorf("log lacks the failure:\n%s", e.log.String())
+	}
+}
+
+// TestGenerateTitleOverlapAcrossRename: a dinner renamed between two
+// generations of an untitled list changes the names to title but not the
+// plan revision. The two title jobs, running at once, each send the model
+// their own names; neither is given the other's title.
+func TestGenerateTitleOverlapAcrossRename(t *testing.T) {
+	e := titleWeek(t)
+	e.model.QueueGenerate(titled("Noodles, Tacos and Chili"), titled("Drunken Noodles Week"))
+	// Each model call waits for the other, so the runs overlap.
+	var arrived sync.WaitGroup
+	arrived.Add(2)
+	e.beforeModel = func(llm.Request) {
+		arrived.Done()
+		done := make(chan struct{})
+		go func() { arrived.Wait(); close(done) }()
+		select {
+		case <-done:
+		case <-time.After(5 * time.Second):
+			t.Error("the title runs did not overlap: one model call never came")
+		}
+	}
+	revision := func() int64 {
+		p, err := db.New(e.st.Reader).GetWeekPlan(t.Context(), week.String())
+		if err != nil {
+			t.Fatal(err)
+		}
+		return p.Revision
+	}
+
+	before := revision()
+	first := e.generate(t)
+	if _, err := e.st.Writer.Exec(`UPDATE dinners SET name = 'Drunken Noodles', normalized_name = 'drunken noodles' WHERE id = ?`, e.ids["Pad Thai"]); err != nil {
+		t.Fatal(err)
+	}
+	second := e.generate(t)
+	if revision() != before {
+		t.Fatalf("plan revision moved from %d to %d: the rename must leave it", before, revision())
+	}
+
+	wantJob(t, e.waitTitle(t, first), jobs.StatusSucceeded, "")
+	wantJob(t, e.waitTitle(t, second), jobs.StatusSucceeded, "")
+	var users []string
+	for _, r := range e.model.Requests() {
+		users = append(users, r.Messages[0].Content)
+	}
+	slices.Sort(users)
+	want := []string{
+		"Title the week whose dinners are, in day order from Monday:\n- Drunken Noodles\n- Fish Tacos\n- Beef Chili",
+		"Title the week whose dinners are, in day order from Monday:\n- Pad Thai\n- Fish Tacos\n- Beef Chili",
+	}
+	if !slices.Equal(users, want) {
+		t.Errorf("model was sent %q, want each generation's own names %q", users, want)
+	}
+	if s := e.runStatuses(t); len(s) != 2 {
+		t.Errorf("archive_title runs = %q, want two", s)
+	}
+	if got := e.storedTitle(t); got == nil || (*got != "Noodles, Tacos and Chili" && *got != "Drunken Noodles Week") {
+		t.Errorf("stored title = %v, want one of the two titles", deref(got))
+	}
+}

internal/store/migrate_test.go

@@ -176,8 +176,8 @@ func TestMigrateEmbeddedMigrations(t *testing.T) {
 	if err := Migrate(context.Background(), s.Writer, migrations.FS); err != nil {
 		t.Fatal(err)
 	}
-	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required" {
+	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required,0016_shopping_list_untitled" {
-		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required", got)
+		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required,0016_shopping_list_untitled", got)
 	}
 }
 
@@ -197,8 +197,8 @@ func TestMigrateBootstrapThenEmbeddedInitApplies(t *testing.T) {
 	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
 		t.Fatal(err)
 	}
-	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required" {
+	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required,0016_shopping_list_untitled" {
-		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required", got)
+		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai,0006_ai_runs_status,0007_recipe_grounding,0008_dinner_recipe_url,0009_dinner_grounding_error,0010_dinner_grounding_revision,0011_ground_dinner_job_revision,0012_suggestion_name,0013_week_plan_revision,0014_rotation_review_name,0015_google_reconnect_required,0016_shopping_list_untitled", got)
 	}
 	if !tableExists(t, s, "dinners") {
 		t.Error("table from 0001_init was not created")
@@ -761,3 +761,131 @@ func TestMigrateGoogleReconnectKeepsConnection(t *testing.T) {
 		t.Errorf("connection after 0015 = %s, want %s", got, row)
 	}
 }
+
+// migrateBefore applies every migration whose name sorts before prefix.
+func migrateBefore(t *testing.T, s *Store, prefix string) {
+	t.Helper()
+	before := fstest.MapFS{}
+	matches, err := fs.Glob(migrations.FS, "*.sql")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, name := range matches {
+		if name >= prefix {
+			continue
+		}
+		body, err := fs.ReadFile(migrations.FS, name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		before[name] = &fstest.MapFile{Data: body}
+	}
+	if err := Migrate(context.Background(), s.Writer, before); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// seedShopping stores two dinners, a plan with dinner-1 on 2026-10-13
+// and dinner-2 on 2026-10-14, and a titled list with a group of
+// groupDinner holding an item marked "have it".
+func seedShopping(t *testing.T, s *Store, groupDinner string) {
+	t.Helper()
+	for _, stmt := range []string{
+		`INSERT INTO dinners (id, name, normalized_name, status, origin, is_favorite, grounding_status, created_at, updated_at)
+			VALUES ('dinner-1', 'Pho', 'pho', 'regular', 'regular', 0, 'grounded', 'c', 'u'),
+			       ('dinner-2', 'Ramen', 'ramen', 'regular', 'regular', 0, 'grounded', 'c', 'u'),
+			       ('dinner-3', 'Laksa', 'laksa', 'regular', 'regular', 0, 'grounded', 'c', 'u')`,
+		`INSERT INTO week_plans (id, week_start, status, created_at, updated_at)
+			VALUES ('plan-1', '2026-10-12', 'synced', 'c', 'u')`,
+		`INSERT INTO plan_days (id, plan_id, date, dinner_id, is_new, created_at, updated_at)
+			VALUES ('day-1', 'plan-1', '2026-10-13', 'dinner-1', 0, 'c', 'u'),
+			       ('day-2', 'plan-1', '2026-10-14', 'dinner-2', 0, 'c', 'u')`,
+		`INSERT INTO shopping_lists (id, week_start, plan_id, title, status, sent_to_chat_at, frozen_at, created_at, updated_at)
+			VALUES ('list-1', '2026-10-12', 'plan-1', 'Noodle week', 'current', 's', NULL, 'c1', 'u1')`,
+		`INSERT INTO shopping_groups (id, list_id, dinner_id, position, created_at, updated_at)
+			VALUES ('group-1', 'list-1', '` + groupDinner + `', 0, 'c2', 'u2')`,
+		`INSERT INTO shopping_items (id, group_id, name, qty, needed, position, created_at, updated_at)
+			VALUES ('item-1', 'group-1', 'rice noodles', '200 g', 0, 0, 'c3', 'u3')`,
+	} {
+		if _, err := s.Writer.Exec(stmt); err != nil {
+			t.Fatalf("seed: %v", err)
+		}
+	}
+}
+
+// TestMigrateShoppingListUntitled applies 0016, which rebuilds the
+// shopping tables: every row survives, a group takes its dinner's plan
+// day, and a list may then be untitled but never have an empty title.
+func TestMigrateShoppingListUntitled(t *testing.T) {
+	ctx := context.Background()
+	s := openTestStore(t)
+	migrateBefore(t, s, "0016")
+	seedShopping(t, s, "dinner-2")
+
+	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+
+	var got string
+	if err := s.Reader.QueryRowContext(ctx, `SELECT
+		l.id || '|' || l.week_start || '|' || l.plan_id || '|' || l.title || '|' || l.status || '|' ||
+		l.sent_to_chat_at || '|' || COALESCE(l.frozen_at, '') || '|' || l.created_at || '|' || l.updated_at || ' / ' ||
+		g.id || '|' || g.list_id || '|' || g.dinner_id || '|' || g.date || '|' || g.position || '|' || g.created_at || '|' || g.updated_at || ' / ' ||
+		i.id || '|' || i.group_id || '|' || i.name || '|' || i.qty || '|' || i.needed || '|' || i.position || '|' || i.created_at || '|' || i.updated_at
+		FROM shopping_lists l JOIN shopping_groups g ON g.list_id = l.id JOIN shopping_items i ON i.group_id = g.id`).Scan(&got); err != nil {
+		t.Fatal(err)
+	}
+	const want = `list-1|2026-10-12|plan-1|Noodle week|current|s||c1|u1 / ` +
+		`group-1|list-1|dinner-2|2026-10-14|0|c2|u2 / ` +
+		`item-1|group-1|rice noodles|200 g|0|0|c3|u3`
+	if got != want {
+		t.Errorf("shopping rows after 0016 =\n %s\nwant\n %s", got, want)
+	}
+
+	if _, err := s.Writer.Exec(`UPDATE shopping_lists SET title = NULL WHERE id = 'list-1'`); err != nil {
+		t.Errorf("untitled list refused: %v", err)
+	}
+	for _, tc := range []struct{ name, stmt, want string }{
+		{"empty title", `UPDATE shopping_lists SET title = '' WHERE id = 'list-1'`, "CHECK constraint failed"},
+		{"group with no date", `UPDATE shopping_groups SET date = NULL WHERE id = 'group-1'`, "NOT NULL constraint failed"},
+		{"group of an unknown list", `UPDATE shopping_groups SET list_id = 'nope' WHERE id = 'group-1'`, "FOREIGN KEY constraint failed"},
+		{"item of an unknown group", `UPDATE shopping_items SET group_id = 'nope' WHERE id = 'item-1'`, "FOREIGN KEY constraint failed"},
+		{"needed not a boolean", `UPDATE shopping_items SET needed = 2 WHERE id = 'item-1'`, "CHECK constraint failed"},
+		{"second list of a week", `INSERT INTO shopping_lists (id, week_start, plan_id, status, created_at, updated_at)
+			VALUES ('list-2', '2026-10-12', 'plan-1', 'current', 'c', 'u')`, "UNIQUE constraint failed"},
+	} {
+		if _, err := s.Writer.Exec(tc.stmt); err == nil || !strings.Contains(err.Error(), tc.want) {
+			t.Errorf("%s: error %v, want %s", tc.name, err, tc.want)
+		}
+	}
+	for _, table := range []string{"shopping_lists_copy", "shopping_groups_copy", "shopping_items_copy"} {
+		if tableExists(t, s, table) {
+			t.Errorf("%s left behind", table)
+		}
+	}
+}
+
+// TestMigrateShoppingListUntitledRefusesUndatedGroup applies 0016 over a
+// group whose dinner is not on its list's plan: it has no plan day, so the
+// migration fails and leaves the database as it was.
+func TestMigrateShoppingListUntitledRefusesUndatedGroup(t *testing.T) {
+	ctx := context.Background()
+	s := openTestStore(t)
+	migrateBefore(t, s, "0016")
+	seedShopping(t, s, "dinner-3")
+
+	err := Migrate(ctx, s.Writer, migrations.FS)
+	if err == nil || !strings.Contains(err.Error(), "NOT NULL constraint failed: shopping_groups.date") {
+		t.Fatalf("Migrate = %v, want the undated group refused", err)
+	}
+	var n int
+	if err := s.Reader.QueryRowContext(ctx, `SELECT count(*) FROM schema_migrations WHERE version = '0016_shopping_list_untitled'`).Scan(&n); err != nil {
+		t.Fatal(err)
+	}
+	if n != 0 {
+		t.Error("0016 recorded as applied")
+	}
+	if tableExists(t, s, "shopping_groups_copy") {
+		t.Error("shopping_groups_copy left behind")
+	}
+}

internal/store/repository_test.go

@@ -43,7 +43,7 @@ var repoParents = map[string]repoRow{
 	}},
 	"shopping_groups": {"shopping_groups", map[string]any{
 		"id": "group-1", "list_id": "list-1", "dinner_id": "dinner-1",
-		"position": int64(0), "created_at": repoTime, "updated_at": repoTime,
+		"date": "2026-10-05", "position": int64(0), "created_at": repoTime, "updated_at": repoTime,
 	}},
 }
 
@@ -108,12 +108,12 @@ func TestRepositoryInsertReadUpdate(t *testing.T) {
 				"title": "Supply run", "status": "current", "sent_to_chat_at": nil, "frozen_at": nil,
 				"created_at": repoTime, "updated_at": repoTime,
 			}},
-			update: map[string]any{"status": "archived", "frozen_at": "2026-10-12T00:00:00Z"},
+			update: map[string]any{"title": nil, "status": "archived", "frozen_at": "2026-10-12T00:00:00Z"},
 		},
 		{
 			parents: []string{"dinners", "week_plans", "shopping_lists"},
 			row: repoRow{"shopping_groups", map[string]any{
-				"id": "group-2", "list_id": "list-1", "dinner_id": "dinner-1", "position": int64(0),
+				"id": "group-2", "list_id": "list-1", "dinner_id": "dinner-1", "date": "2026-10-06", "position": int64(0),
 				"created_at": repoTime, "updated_at": repoTime,
 			}},
 			update: map[string]any{"position": int64(3)},

internal/store/schema_test.go

@@ -136,6 +136,7 @@ func testRow(table string, i int) map[string]any {
 	case "shopping_groups":
 		r["list_id"] = rowID("shopping_lists", 0)
 		r["dinner_id"] = rowID("dinners", 0)
+		r["date"] = fmt.Sprintf("2026-01-%02d", i+5)
 		r["position"] = i
 	case "shopping_items":
 		r["group_id"] = rowID("shopping_groups", 0)

migrations/0016_shopping_list_untitled.sql

@@ -0,0 +1,81 @@
+-- 0016_shopping_list_untitled: a Supply run is generated from the plan
+-- before it has a title, and stays untitled when the AI cannot write one,
+-- so shopping_lists.title becomes nullable; an untitled list shows its
+-- week label instead. A title is never empty. Each group also keeps the
+-- plan day it shops for, so a list read back, or frozen into the Supply
+-- archive, says which day each dinner was planned on.
+-- SQLite cannot drop a NOT NULL constraint or add a NOT NULL column
+-- without a default, so the three shopping tables are rebuilt as 0012
+-- does: copy the rows aside, drop the tables children first, create them
+-- again, copy the rows back parents first and drop the copies. A group
+-- takes the date its dinner has on its list's plan; a group whose dinner
+-- is not on that plan has no date and fails the migration. Nothing else
+-- references the shopping tables.
+
+CREATE TABLE shopping_items_copy AS SELECT * FROM shopping_items;
+CREATE TABLE shopping_groups_copy AS SELECT * FROM shopping_groups;
+CREATE TABLE shopping_lists_copy AS SELECT * FROM shopping_lists;
+
+DROP TABLE shopping_items;
+DROP TABLE shopping_groups;
+DROP TABLE shopping_lists;
+
+CREATE TABLE shopping_lists (
+	id              TEXT NOT NULL PRIMARY KEY,
+	week_start      TEXT NOT NULL UNIQUE,
+	plan_id         TEXT NOT NULL REFERENCES week_plans (id),
+	title           TEXT CHECK (title <> ''), -- NULL until the AI titles it
+	status          TEXT NOT NULL CHECK (status IN ('current', 'archived')),
+	sent_to_chat_at TEXT,
+	frozen_at       TEXT,
+	created_at      TEXT NOT NULL,
+	updated_at      TEXT NOT NULL
+);
+
+CREATE TABLE shopping_groups (
+	id         TEXT    NOT NULL PRIMARY KEY,
+	list_id    TEXT    NOT NULL REFERENCES shopping_lists (id),
+	dinner_id  TEXT    NOT NULL REFERENCES dinners (id),
+	date       TEXT    NOT NULL, -- the plan day, household-local YYYY-MM-DD
+	position   INTEGER NOT NULL,
+	created_at TEXT    NOT NULL,
+	updated_at TEXT    NOT NULL
+);
+
+CREATE TABLE shopping_items (
+	id         TEXT    NOT NULL PRIMARY KEY,
+	group_id   TEXT    NOT NULL REFERENCES shopping_groups (id),
+	name       TEXT    NOT NULL,
+	qty        TEXT,
+	needed     INTEGER NOT NULL DEFAULT 1 CHECK (needed IN (0, 1)),
+	position   INTEGER NOT NULL,
+	created_at TEXT    NOT NULL,
+	updated_at TEXT    NOT NULL
+);
+
+INSERT INTO shopping_lists (
+	id, week_start, plan_id, title, status, sent_to_chat_at, frozen_at, created_at, updated_at
+)
+SELECT id, week_start, plan_id, title, status, sent_to_chat_at, frozen_at, created_at, updated_at
+FROM shopping_lists_copy;
+
+INSERT INTO shopping_groups (id, list_id, dinner_id, date, position, created_at, updated_at)
+SELECT
+	shopping_groups_copy.id, shopping_groups_copy.list_id, shopping_groups_copy.dinner_id,
+	(
+		SELECT MIN(plan_days.date)
+		FROM plan_days
+		JOIN shopping_lists_copy ON shopping_lists_copy.plan_id = plan_days.plan_id
+		WHERE shopping_lists_copy.id = shopping_groups_copy.list_id
+			AND plan_days.dinner_id = shopping_groups_copy.dinner_id
+	),
+	shopping_groups_copy.position, shopping_groups_copy.created_at, shopping_groups_copy.updated_at
+FROM shopping_groups_copy;
+
+INSERT INTO shopping_items (id, group_id, name, qty, needed, position, created_at, updated_at)
+SELECT id, group_id, name, qty, needed, position, created_at, updated_at
+FROM shopping_items_copy;
+
+DROP TABLE shopping_items_copy;
+DROP TABLE shopping_groups_copy;
+DROP TABLE shopping_lists_copy;

migrations/queries/shopping.sql

@@ -0,0 +1,104 @@
+-- name: GetShoppingList :one
+-- The Supply run of the week starting week_start. Returns sql.ErrNoRows
+-- when there is none.
+SELECT * FROM shopping_lists
+WHERE week_start = ?;
+
+-- name: CreateShoppingList :exec
+-- A new, untitled Supply run: the title is written later, by the AI.
+INSERT INTO shopping_lists (id, week_start, plan_id, status, created_at, updated_at)
+VALUES (?, ?, ?, 'current', ?, ?);
+
+-- name: RegenerateShoppingList :exec
+-- Records a generation of list id from plan plan_id.
+UPDATE shopping_lists
+SET plan_id = ?, updated_at = ?
+WHERE id = ?;
+
+-- name: ListShoppingGroups :many
+-- The groups of list list_id, in list order.
+SELECT * FROM shopping_groups
+WHERE list_id = ?
+ORDER BY position, id;
+
+-- name: ListShoppingItems :many
+-- The items of list list_id with their group's dinner, in list order: by
+-- group, then by item.
+SELECT sqlc.embed(shopping_items), shopping_groups.dinner_id
+FROM shopping_items
+JOIN shopping_groups ON shopping_groups.id = shopping_items.group_id
+WHERE shopping_groups.list_id = ?
+ORDER BY shopping_groups.position, shopping_items.position, shopping_items.id;
+
+-- name: CreateShoppingGroup :exec
+INSERT INTO shopping_groups (id, list_id, dinner_id, date, position, created_at, updated_at)
+VALUES (?, ?, ?, ?, ?, ?, ?);
+
+-- name: MoveShoppingGroup :exec
+UPDATE shopping_groups
+SET position = ?, updated_at = ?
+WHERE id = ?;
+
+-- name: DeleteShoppingGroup :exec
+DELETE FROM shopping_groups
+WHERE id = ?;
+
+-- name: CreateShoppingItem :exec
+-- A new item is needed until the household marks it "have it".
+INSERT INTO shopping_items (id, group_id, name, qty, needed, position, created_at, updated_at)
+VALUES (?, ?, ?, ?, 1, ?, ?, ?);
+
+-- name: MoveShoppingItem :exec
+-- Places item id in group group_id at position with quantity qty; its
+-- name and needed flag are kept.
+UPDATE shopping_items
+SET group_id = ?, qty = ?, position = ?, updated_at = ?
+WHERE id = ?;
+
+-- name: DeleteShoppingItem :exec
+DELETE FROM shopping_items
+WHERE id = ?;
+
+-- name: ListShoppingGroupDinners :many
+-- The groups of list list_id with their dinner's name, in list order.
+SELECT sqlc.embed(shopping_groups), dinners.name AS dinner_name
+FROM shopping_groups
+JOIN dinners ON dinners.id = shopping_groups.dinner_id
+WHERE shopping_groups.list_id = ?
+ORDER BY shopping_groups.position, shopping_groups.id;
+
+-- name: GetShoppingItemList :one
+-- The Supply run holding item id. Returns sql.ErrNoRows when there is no
+-- such item.
+SELECT sqlc.embed(shopping_lists)
+FROM shopping_items
+JOIN shopping_groups ON shopping_groups.id = shopping_items.group_id
+JOIN shopping_lists ON shopping_lists.id = shopping_groups.list_id
+WHERE shopping_items.id = ?;
+
+-- name: SetShoppingItemNeeded :exec
+-- Marks item id needed (1) or "have it" (0).
+UPDATE shopping_items
+SET needed = ?, updated_at = ?
+WHERE id = ?;
+
+-- name: SetShoppingListTitle :execrows
+-- Titles list id, unless it has a title already or is frozen into the
+-- Supply archive.
+UPDATE shopping_lists
+SET title = ?, updated_at = ?
+WHERE id = ? AND title IS NULL AND status = 'current' AND frozen_at IS NULL;
+
+-- name: FreezeShoppingList :execrows
+-- Freezes list id into the Supply archive at frozen_at, unless it is
+-- frozen already.
+UPDATE shopping_lists
+SET status = 'archived', frozen_at = ?, updated_at = ?
+WHERE id = ? AND frozen_at IS NULL;
+
+-- name: ListShoppingListsThrough :many
+-- The Supply runs of the weeks starting on or before week_start, newest
+-- week first.
+SELECT * FROM shopping_lists
+WHERE week_start <= ?
+ORDER BY week_start DESC;

web/src/App.test.tsx

@@ -8,6 +8,7 @@ import App, { routes } from './App.tsx'
 import { AI_SETTINGS, HOUSEHOLD_SETTINGS, RECIPE_SEARCH_SETTINGS, SETTINGS_API } from './test/ApiProviders.tsx'
 import { InDataRouter } from './test/dataRouter.tsx'
 import { dinnerBody } from './test/dinners.ts'
+import { defaultWeek } from './plan/week.ts'
 
 afterEach(() => {
   Reflect.deleteProperty(window, 'matchMedia')
@@ -31,6 +32,8 @@ function renderAppAt(path: string, location = fakeLocation(path)) {
 const SCREENS = {
   '/onboarding': true,
   '/plan': true,
+  '/plan/shopping': true,
+  '/plan/shopping/archive': true,
   '/discover': true,
   '/settings': true,
   '/settings/ai': true,
@@ -105,6 +108,41 @@ describe('App routes', () => {
     expect(await screen.findByText('••••••••3f9a')).toBeInTheDocument()
   })
 
+  it('/plan/shopping renders the Supply run inside the shell', async () => {
+    mockViewport(390)
+    const week = defaultWeek(HOUSEHOLD_SETTINGS, new Date())
+    stubFetchByPath({
+      ...SIGNED_IN,
+      [`/api/v1/shopping/${week}`]: () =>
+        jsonResponse(200, {
+          weekStart: week,
+          label: 'Week 41 · Oct 5 – 11',
+          title: null,
+          status: 'current',
+          sent_to_chat_at: null,
+          needed_count: 1,
+          total_count: 1,
+          groups: [{ dinner: { id: 'd1', name: 'Beef tacos' }, date: week, day: 'Monday', items: [{ id: 'i1', name: 'Ground beef', qty: '1 lb', needed: true }] }],
+        }),
+    })
+    renderAt('/plan/shopping')
+    const heading = await screen.findByRole('heading', { level: 1, name: 'Shopping list' })
+    expect(screen.getByRole('main')).toContainElement(heading)
+    expect(await screen.findByRole('checkbox', { name: 'Ground beef' })).toBeChecked()
+  })
+
+  it('/plan/shopping/archive renders the Supply archive inside the shell', async () => {
+    mockViewport(390)
+    stubFetchByPath({
+      ...SIGNED_IN,
+      '/api/v1/shopping/archive?by=week': () => jsonResponse(200, { by: 'week', periods: [] }),
+    })
+    renderAt('/plan/shopping/archive')
+    const heading = await screen.findByRole('heading', { level: 1, name: 'Supply archive' })
+    expect(screen.getByRole('main')).toContainElement(heading)
+    expect(await screen.findByText('Nothing archived yet')).toBeInTheDocument()
+  })
+
   it('/discover renders the Side quests deck inside the shell', async () => {
     mockViewport(390)
     stubFetchByPath({

web/src/App.tsx

@@ -16,6 +16,9 @@ import { HouseholdSettingsPage } from './settings/HouseholdSettingsPage.tsx'
 import { RegularsSettingsPage } from './settings/RegularsSettingsPage.tsx'
 import { SettingsPage } from './settings/SettingsPage.tsx'
 import { AppShell } from './shell/AppShell.tsx'
+import { SupplyRunSync } from './shopping/api.ts'
+import { SupplyArchivePage } from './shopping/SupplyArchivePage.tsx'
+import { SupplyRunPage } from './shopping/SupplyRunPage.tsx'
 
 // Every route the app serves, with the heading its placeholder page shows.
 export const routes = [
@@ -39,6 +42,8 @@ export const routes = [
 // The screens built so far; every other route shows its placeholder page.
 const screens: Partial<Record<(typeof routes)[number]['path'], ReactNode>> = {
   '/plan': <PlanPage />,
+  '/plan/shopping': <SupplyRunPage />,
+  '/plan/shopping/archive': <SupplyArchivePage />,
   '/discover': <DiscoverPage />,
   '/settings': <SettingsPage />,
   '/settings/ai': <AISettingsPage />,
@@ -86,6 +91,7 @@ export default function App({ api, serviceWorker }: AppProps) {
     <ApiProvider client={api}>
       <QueryClientProvider client={queryClient}>
         <AuthBootstrap>
+          <SupplyRunSync />
           <AppRoutes />
         </AuthBootstrap>
         <OfflinePill />

web/src/AuthBootstrap.tsx

@@ -20,7 +20,7 @@ export const meQueryKey = [ME_PATH] as const
 export function AuthBootstrap({ children }: { children: ReactNode }) {
   const api = useApi()
   const forbidden = useSyncExternalStore(api.subscribe, api.forbidden)
-  const me = useQuery({ queryKey: meQueryKey, queryFn: api.loadMe, staleTime: Infinity, networkMode: 'always' })
+  const me = useQuery({ queryKey: meQueryKey, queryFn: () => api.loadMe(), staleTime: Infinity, networkMode: 'always' })
   // fetch rejects with a TypeError only when the network fails.
   const savedPages = me.isError && me.error instanceof TypeError && api.session.verified()
   const { refetch } = me

web/src/api/client.test.ts

@@ -125,6 +125,66 @@ describe('apiFetch', () => {
     expect(api.forbidden()).toBe(false)
   })
 
+  it('shares a csrf refresh between requests, but one whose signal aborts stops waiting and the next refreshes afresh', async () => {
+    // The first refresh answers only when answerFirst is called; every other
+    // request answers at once.
+    let answerFirst!: (response: Response) => void
+    const mes: (AbortSignal | null | undefined)[] = []
+    const fetchMock = vi.fn<typeof fetch>((input, init) => {
+      if (String(input) === '/api/v1/me') {
+        mes.push(init?.signal)
+        if (mes.length === 2) return new Promise((resolve) => (answerFirst = resolve))
+        return Promise.resolve(jsonResponse(200, { ...ME, csrfToken: `token-${mes.length}` }))
+      }
+      const token = new Headers(init?.headers).get(CSRF_HEADER)
+      return Promise.resolve(token === 'token-1' ? errorResponse(403, 'csrf') : jsonResponse(201, { token }))
+    })
+    vi.stubGlobal('fetch', fetchMock)
+    const api = createApiClient(fakeLocation(), createNetworkStatus(window), createVerifiedSession(localStorage))
+    await api.loadMe()
+
+    const unbounded = api.apiFetch('/api/v1/jobs', { method: 'POST', body: {} })
+    const timedOut = new AbortController()
+    const bounded = api.apiFetch('/api/v1/jobs', { method: 'POST', body: {}, signal: timedOut.signal })
+    await vi.waitFor(() => expect(mes).toHaveLength(2))
+    timedOut.abort(new DOMException('no answer in time', 'TimeoutError'))
+    await expect(bounded).rejects.toMatchObject({ name: 'TimeoutError' })
+    // A request without a signal still waits for it, so it is not aborted.
+    expect(mes[1]!.aborted).toBe(false)
+
+    // A later csrf 403 does not wait on the refresh still in flight.
+    await expect(
+      api.apiFetch('/api/v1/jobs', { method: 'POST', body: {}, signal: new AbortController().signal }),
+    ).resolves.toEqual({ token: 'token-3' })
+    expect(mes).toHaveLength(3)
+
+    answerFirst(jsonResponse(200, { ...ME, csrfToken: 'token-2' }))
+    await expect(unbounded).resolves.toEqual({ token: 'token-2' })
+    expect(mes).toHaveLength(3)
+    expect(fetchMock.mock.calls.filter(([, init]) => init?.method === 'POST')).toHaveLength(5)
+  })
+
+  it('aborts a csrf refresh once the only request waiting for it aborts, without counting it as offline', async () => {
+    const mes: AbortSignal[] = []
+    const fetchMock = vi.fn<typeof fetch>((input, init) => {
+      if (String(input) !== '/api/v1/me') return Promise.resolve(errorResponse(403, 'csrf'))
+      if (mes.push(init!.signal!) === 1) return Promise.resolve(jsonResponse(200, ME))
+      return new Promise((_, reject) => init!.signal!.addEventListener('abort', () => reject(init!.signal!.reason as Error)))
+    })
+    vi.stubGlobal('fetch', fetchMock)
+    const network = createNetworkStatus(window)
+    const api = createApiClient(fakeLocation(), network, createVerifiedSession(localStorage))
+    await api.loadMe()
+
+    const timedOut = new AbortController()
+    const bounded = api.apiFetch('/api/v1/jobs', { method: 'POST', body: {}, signal: timedOut.signal })
+    await vi.waitFor(() => expect(mes).toHaveLength(2))
+    timedOut.abort(new DOMException('no answer in time', 'TimeoutError'))
+    await expect(bounded).rejects.toMatchObject({ name: 'TimeoutError' })
+    expect(mes[1]!.aborted).toBe(true)
+    expect(network.offline()).toBe(false)
+  })
+
   it('marks any other 403 as not in this household and notifies subscribers', async () => {
     const fetchMock = stubFetch(errorResponse(403, 'forbidden'))
     const api = createApiClient(fakeLocation(), createNetworkStatus(window), createVerifiedSession(localStorage))
@@ -153,6 +213,18 @@ describe('apiFetch', () => {
 })
 
 describe('loadMe', () => {
+  it('aborts /me with its signal', async () => {
+    vi.stubGlobal(
+      'fetch',
+      vi.fn<typeof fetch>((_, init) => new Promise((_, reject) => init!.signal!.addEventListener('abort', () => reject(init!.signal!.reason as Error)))),
+    )
+    const api = createApiClient(fakeLocation(), createNetworkStatus(window), createVerifiedSession(localStorage))
+    const timedOut = new AbortController()
+    const me = api.loadMe(timedOut.signal)
+    timedOut.abort(new DOMException('no answer in time', 'TimeoutError'))
+    await expect(me).rejects.toMatchObject({ name: 'TimeoutError' })
+  })
+
   it('rejects a /me response without a CSRF token', async () => {
     stubFetch(jsonResponse(200, { ...ME, csrfToken: '' }))
     const api = createApiClient(fakeLocation(), createNetworkStatus(window), createVerifiedSession(localStorage))

web/src/api/client.ts

@@ -41,6 +41,10 @@ export type ApiRequest = {
   method?: 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE'
   // Sent as JSON. A GET must not have one.
   body?: unknown
+  // Aborts the request, including the /me refresh a csrf 403 makes it wait
+  // for; it then rejects with the signal's reason. No request has a deadline
+  // unless its caller aborts it.
+  signal?: AbortSignal
 }
 
 // ApiRead is a GET's decoded response body, and whether the service worker
@@ -55,8 +59,9 @@ export type ApiClient = {
   // apiRead is apiFetch's GET that also says whether the body is the service
   // worker's cached copy rather than the server's answer.
   apiRead<T>(path: string): Promise<ApiRead<T>>
-  // loadMe fetches GET /api/v1/me and caches its CSRF token.
+  // loadMe fetches GET /api/v1/me and caches its CSRF token; signal aborts
-  loadMe(): Promise<Me>
+  // it, as it does an apiFetch.
+  loadMe(signal?: AbortSignal): Promise<Me>
   // forbidden reports whether a request was refused because the signed-in
   // account is not in this household; subscribe is notified when it changes.
   forbidden(): boolean
@@ -70,15 +75,20 @@ export type ApiClient = {
   session: VerifiedSession
 }
 
+// Refresh is the /me request refreshMe shares: controller aborts it, waiting
+// counts the requests with a signal still waiting for it, and unbounded says
+// whether one without a signal is.
+type Refresh = { me: Promise<Me>; controller: AbortController; waiting: number; unbounded: boolean }
+
 // createApiClient builds the app's API client. location is window.location in
 // the app: a 401 sends it to /auth/login with the current path to return to.
 export function createApiClient(location: ApiLocation, network: NetworkStatus, session: VerifiedSession): ApiClient {
   let csrfToken: string | null = null
-  let refreshing: Promise<Me> | null = null
+  let refreshing: Refresh | null = null
   let forbidden = false
   const listeners = new Set<() => void>()
 
-  async function send(method: string, path: string, body: unknown): Promise<Response> {
+  async function send(method: string, path: string, body: unknown, signal: AbortSignal | undefined): Promise<Response> {
     const headers: Record<string, string> = { Accept: 'application/json' }
     if (body !== undefined) headers['Content-Type'] = 'application/json'
     if (method !== 'GET') {
@@ -97,7 +107,7 @@ export function createApiClient(location: ApiLocation, network: NetworkStatus, s
     }
     let response: Response
     try {
-      response = await fetch(path, { method, headers, credentials: 'same-origin', body: json })
+      response = await fetch(path, { method, headers, credentials: 'same-origin', body: json, signal })
     } catch (error) {
       // fetch rejects with a TypeError when the network fails; an abort is a
       // DOMException and says nothing about the network.
@@ -112,12 +122,46 @@ export function createApiClient(location: ApiLocation, network: NetworkStatus, s
   }
 
   // refreshMe shares one in-flight /me request between every request that
-  // got a csrf 403 at the same time.
+  // got a csrf 403 at the same time. A request whose signal aborts stops
-  function refreshMe(): Promise<Me> {
+  // waiting for it at once, and it is no longer shared: the next csrf 403
-    refreshing ??= loadMe().finally(() => {
+  // starts a fresh /me rather than wait on one that may never answer. Once
-      refreshing = null
+  // every request with a signal waiting for it has stopped, and none without
+  // one waits, it is aborted.
+  function refreshMe(signal: AbortSignal | undefined): Promise<Me> {
+    if (refreshing === null) {
+      const controller = new AbortController()
+      const refresh: Refresh = { me: loadMe(controller.signal), controller, waiting: 0, unbounded: false }
+      const done = () => {
+        if (refreshing === refresh) refreshing = null
+      }
+      refresh.me.then(done, done)
+      refreshing = refresh
+    }
+    const refresh = refreshing
+    if (signal === undefined) {
+      refresh.unbounded = true
+      return refresh.me
+    }
+    refresh.waiting++
+    return new Promise((resolve, reject) => {
+      const stop = () => {
+        if (refreshing === refresh) refreshing = null
+        if (--refresh.waiting === 0 && !refresh.unbounded) refresh.controller.abort(signal.reason)
+        reject(signal.reason as Error)
+      }
+      if (signal.aborted) return stop()
+      signal.addEventListener('abort', stop, { once: true })
+      refresh.me.then(
+        (me) => {
+          signal.removeEventListener('abort', stop)
+          resolve(me)
+        },
+        (error: unknown) => {
+          signal.removeEventListener('abort', stop)
+          reject(error as Error)
+        },
+      )
     })
-    return refreshing
   }
 
   async function apiFetch<T>(path: string, request: ApiRequest = {}): Promise<T> {
@@ -138,14 +182,14 @@ export function createApiClient(location: ApiLocation, network: NetworkStatus, s
     if (method === 'GET' && request.body !== undefined) {
       throw new Error(`GET ${path}: a GET request cannot carry a body`)
     }
-    let response = await send(method, url, request.body)
+    let response = await send(method, url, request.body, request.signal)
     if (response.status === 403) {
       const error = await parseForbidden(method, path, response)
       // Only a non-GET carries the token, so only it can be refused for it.
       if (error.code !== 'csrf' || method === 'GET') throw error
       // The session's token changed: refresh it once and retry once.
-      await refreshMe()
+      await refreshMe(request.signal)
-      response = await send(method, url, request.body)
+      response = await send(method, url, request.body, request.signal)
       if (response.status === 403) throw await parseForbidden(method, path, response)
     }
     return { body: await decode<T>(method, path, response), cached: response.headers.has(cacheFallbackHeader) }
@@ -176,8 +220,8 @@ export function createApiClient(location: ApiLocation, network: NetworkStatus, s
     return (await response.json()) as T
   }
 
-  async function loadMe(): Promise<Me> {
+  async function loadMe(signal?: AbortSignal): Promise<Me> {
-    const me = await apiFetch<unknown>(ME_PATH)
+    const me = await apiFetch<unknown>(ME_PATH, { signal })
     if (
       !isRecord(me) ||
       typeof me.name !== 'string' ||

web/src/plan/PlanPage.module.css

@@ -258,8 +258,8 @@
   color: var(--color-neutral-700);
 }
 
-/* An action with nothing behind it yet (the shopping list until Feature
+/* An action with nothing behind it yet (Send to Google Chat until Feature
-   17): it keeps focus, so hovering, tapping or focusing it shows the
+   19): it keeps focus, so hovering, tapping or focusing it shows the
    tooltip. */
 .unavailable {
   position: relative;
@@ -414,6 +414,31 @@
   text-align: center;
 }
 
+/* What became of the week's Supply run after a push. */
+.pushed {
+  margin: 0;
+  font-family: var(--font-body);
+  font-size: 14px;
+  font-weight: 700;
+  text-align: center;
+  color: var(--color-neutral-700);
+}
+
+/* The way to the week's Supply run under the Draft board on mobile. */
+.shoppingLink {
+  display: inline-flex;
+  align-self: center;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  min-height: 44px;
+  font-family: var(--font-body);
+  font-size: 14px;
+  font-weight: 700;
+  color: var(--color-accent-700);
+  text-decoration: none;
+}
+
 /* A push failure's way to the Google Calendar settings. */
 .settingsLink {
   color: inherit;

web/src/plan/PlanPage.test.tsx

@@ -1,9 +1,10 @@
-import { QueryClientProvider } from '@tanstack/react-query'
+import { QueryClientProvider, type QueryClient } from '@tanstack/react-query'
 import { act, fireEvent, render, screen, waitFor, within } from '@testing-library/react'
-import { MemoryRouter } from 'react-router'
+import { Link, MemoryRouter, Route, Routes, useLocation } from 'react-router'
 import { afterEach, beforeEach, describe, expect, it, vi, type Mock } from 'vitest'
 import { ApiProvider, createApiClient, createQueryClient, createVerifiedSession } from '../api/index.ts'
 import { createNetworkStatus } from '../pwa/networkStatus.ts'
+import { SupplyRunPage } from '../shopping/SupplyRunPage.tsx'
 import { cacheFallbackHeader } from '../sw/routes.ts'
 import { HOUSEHOLD_SETTINGS } from '../test/ApiProviders.tsx'
 import { declaredStyle } from '../test/cssRules.ts'
@@ -52,9 +53,33 @@ function planBody(status: string, names = NAMES) {
 }
 
 // syncedNow is the plan of the week of Oct 5 as a push answers it: synced
-// at the tests' noon.
+// at the tests' noon, with what became of the week's Supply run, made
-function syncedNow() {
+// unless told otherwise.
-  return { ...planBody('synced'), calendar_synced_at: '2026-10-07T16:00:00Z' }
+function syncedNow(supplyRun: { status: string; error: { code: string; message: string; retryable: boolean } | null } = GENERATED) {
+  return { ...planBody('synced'), calendar_synced_at: '2026-10-07T16:00:00Z', supply_run: supplyRun }
+}
+
+// The Supply run outcomes a push answers with, as the server sends them.
+const GENERATED = { status: 'generated', error: null }
+const ARCHIVED = {
+  status: 'archived',
+  error: { code: 'archived', message: 'the Supply run is in the Supply archive', retryable: false },
+}
+const PLAN_CHANGED = {
+  status: 'failed',
+  error: {
+    code: 'plan_changed',
+    message: 'the plan is on Calendar as pushed, but it was edited before its Supply run was made, so no Supply run was made from it; push again',
+    retryable: true,
+  },
+}
+const SUPPLY_RUN_FAILED = {
+  status: 'failed',
+  error: {
+    code: 'supply_run_failed',
+    message: 'the plan is on Calendar, but its Supply run could not be made; make it again from the Supply run',
+    retryable: true,
+  },
 }
 
 // deferred is a response the test sends when it chooses.
@@ -100,8 +125,12 @@ const lists = {
     jsonResponse(200, { dinners: [dinner('d0', 'Beef tacos', 'easy', 30), dinner('r1', 'Fish tacos', 'medium', 35)] }),
 }
 
+// SUPPLY_RUN is the Supply run of a week, as GET /api/v1/shopping/{weekStart}.
+const SUPPLY_RUN = /^GET \/api\/v1\/shopping\/\d{4}-\d{2}-\d{2}$/
+
 // stubServer answers "METHOD path" requests from responders, with /me and
-// the household settings; any other request fails the test.
+// the household settings, and no Supply run (404) for a week given none;
+// any other request fails the test.
 function stubServer(responders: Record<string, Responder>) {
   const all: Record<string, Responder> = {
     'GET /api/v1/me': () => jsonResponse(200, ME),
@@ -110,7 +139,7 @@ function stubServer(responders: Record<string, Responder>) {
   }
   const fetchMock = vi.fn<typeof fetch>((input, init) => {
     const key = `${init?.method ?? 'GET'} ${String(input)}`
-    const respond = Object.hasOwn(all, key) ? all[key] : undefined
+    const respond = Object.hasOwn(all, key) ? all[key] : SUPPLY_RUN.test(key) ? () => errorResponse(404, 'not_found') : undefined
     if (respond === undefined) throw new Error(`unexpected fetch: ${key}`)
     return Promise.resolve(respond(init))
   })
@@ -131,21 +160,67 @@ function planReads(fetchMock: Mock<typeof fetch>) {
 }
 
 // renderPage loads /me (for the CSRF token every write needs) and renders
-// the Plan page.
+// the Plan page, over queryClient, with shopping as the Supply run screen.
-async function renderPage() {
+async function renderPage(queryClient: QueryClient = createQueryClient(), shopping = <Opened />) {
   const api = createApiClient(fakeLocation('/plan'), createNetworkStatus(window), createVerifiedSession(localStorage))
   await api.loadMe()
   return render(
     <ApiProvider client={api}>
-      <QueryClientProvider client={createQueryClient()}>
+      <QueryClientProvider client={queryClient}>
         <MemoryRouter initialEntries={['/plan']}>
-          <PlanPage />
+          <Routes>
+            <Route path="/plan" element={<PlanPage />} />
+            <Route path="/plan/shopping" element={shopping} />
+          </Routes>
         </MemoryRouter>
       </QueryClientProvider>
     </ApiProvider>,
   )
 }
 
+// Opened stands in for the screen a link opened, saying where it is, with
+// a link back to the Plan.
+function Opened() {
+  const { pathname, search } = useLocation()
+  return (
+    <>
+      <p>Opened {pathname + search}</p>
+      <Link to="/plan">Back to the Plan</Link>
+    </>
+  )
+}
+
+// pushesKept counts the pushes of the week of Oct 5 the mutation cache of
+// queryClient keeps.
+function pushesKept(queryClient: QueryClient) {
+  return queryClient.getMutationCache().findAll({ mutationKey: ['plans', '2026-10-05', 'push'] }).length
+}
+
+// SupplyRunScreen is the Supply run screen, with a link back to the Plan.
+function SupplyRunScreen() {
+  return (
+    <>
+      <SupplyRunPage />
+      <Link to="/plan">Back to the Plan</Link>
+    </>
+  )
+}
+
+// supplyRun is the Supply run of the week of Oct 5 with needed of its 32
+// items still to buy.
+function supplyRun(needed: number) {
+  return {
+    weekStart: '2026-10-05',
+    label: 'Week 41 · Oct 5 – 11',
+    title: null,
+    status: 'current',
+    sent_to_chat_at: null,
+    needed_count: needed,
+    total_count: 32,
+    groups: [],
+  }
+}
+
 // Wednesday Oct 7, noon in New York: before Friday's 09:00 plan_draft, so
 // the page opens on this week.
 beforeEach(() => {
@@ -392,6 +467,236 @@ describe('PlanPage', () => {
     expect(planReads(fetchMock)).toBe(2)
   })
 
+  it("reads the week's Supply run again once a push has made it, and says it was made", async () => {
+    let run = () => errorResponse(404, 'not_found')
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`POST ${PUSH}`]: () => {
+        run = () => jsonResponse(200, supplyRun(28))
+        return jsonResponse(200, syncedNow(GENERATED))
+      },
+      'GET /api/v1/shopping/2026-10-05': () => run(),
+    })
+    await renderPage()
+
+    expect(await screen.findByRole('link', { name: 'Shopping list' })).toBeInTheDocument()
+    fireEvent.click(screen.getByRole('button', { name: 'Looks good — push to Calendar' }))
+    expect(await screen.findByText('Synced to Google Calendar just now')).toBeInTheDocument()
+    expect(screen.getByRole('status')).toHaveTextContent("Made this week's Supply run from the plan.")
+    // The list made is read at once, not after the cached 404 goes stale.
+    expect(await screen.findByRole('link', { name: 'Shopping list · 28' })).toBeInTheDocument()
+    expect(fetchMock.mock.calls.filter(([input]) => String(input) === '/api/v1/shopping/2026-10-05')).toHaveLength(2)
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('says a Supply run in the Supply archive was left as it was', async () => {
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`POST ${PUSH}`]: () => jsonResponse(200, syncedNow(ARCHIVED)),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    expect(await screen.findByText('Synced to Google Calendar just now')).toBeInTheDocument()
+    expect(screen.getByRole('status')).toHaveTextContent("This week's Supply run is in the Supply archive, so it was left as it was.")
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('says no Supply run was made when the plan changed after it was pushed, reads the plan again, and pushes again on Retry', async () => {
+    let plan = planBody('draft')
+    let push = () => {
+      plan = planBody('changed', ['Lasagna', ...NAMES.slice(1)])
+      return jsonResponse(200, syncedNow(PLAN_CHANGED))
+    }
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, plan),
+      [`POST ${PUSH}`]: () => push(),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent(
+      'Pushed to Calendar, but the plan changed before its Supply run was made, so no shopping list was made from it; push it again.',
+    )
+    expect(screen.queryByRole('status')).not.toBeInTheDocument()
+    // The plan edited meanwhile is the one shown, not the one pushed.
+    expect(await screen.findByText('Lasagna')).toBeInTheDocument()
+    expect(screen.getByText('Changes not pushed to Google Calendar')).toBeInTheDocument()
+    expect(planReads(fetchMock)).toBe(2)
+
+    push = () => jsonResponse(200, syncedNow(GENERATED))
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    expect(await screen.findByRole('status')).toHaveTextContent("Made this week's Supply run from the plan.")
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    expect(posts(fetchMock)).toEqual([`${PUSH} undefined`, `${PUSH} undefined`])
+  })
+
+  it('says the Supply run could not be made after the push, and makes the shopping list again', async () => {
+    let generate = () => errorResponse(500, 'internal')
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`POST ${PUSH}`]: () => jsonResponse(200, syncedNow(SUPPLY_RUN_FAILED)),
+      'POST /api/v1/shopping/2026-10-05/generate': () => generate(),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    // Calendar has the plan, but the push is not reported a quiet success.
+    expect(await screen.findByText('Synced to Google Calendar just now')).toBeInTheDocument()
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Pushed to Calendar, but this week's Supply run couldn't be made.")
+    expect(screen.queryByRole('status')).not.toBeInTheDocument()
+
+    fireEvent.click(within(alert).getByRole('button', { name: 'Make the shopping list' }))
+    expect(
+      await screen.findByText("Pushed to Calendar, but this week's Supply run couldn't be made. Couldn't make the shopping list. internal message"),
+    ).toBeInTheDocument()
+
+    generate = () => jsonResponse(200, { ...supplyRun(28), skipped: [] })
+    fireEvent.click(within(screen.getByRole('alert')).getByRole('button', { name: 'Make the shopping list' }))
+    expect(await screen.findByRole('status')).toHaveTextContent("Made this week's Supply run from the plan.")
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    expect(screen.getByRole('link', { name: 'Shopping list · 28' })).toBeInTheDocument()
+    expect(posts(fetchMock)).toEqual([
+      `${PUSH} undefined`,
+      '/api/v1/shopping/2026-10-05/generate undefined',
+      '/api/v1/shopping/2026-10-05/generate undefined',
+    ])
+  })
+
+  it('no longer says the Supply run could not be made once the shopping list is made, after leaving the Plan and coming back', async () => {
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`POST ${PUSH}`]: () => jsonResponse(200, syncedNow(SUPPLY_RUN_FAILED)),
+      'POST /api/v1/shopping/2026-10-05/generate': () => jsonResponse(200, { ...supplyRun(28), skipped: [] }),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Pushed to Calendar, but this week's Supply run couldn't be made.")
+
+    // A Supply run never made is still said after leaving the Plan and
+    // coming back.
+    fireEvent.click(screen.getByRole('link', { name: 'Shopping list' }))
+    fireEvent.click(await screen.findByRole('link', { name: 'Back to the Plan' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent("Pushed to Calendar, but this week's Supply run couldn't be made.")
+
+    fireEvent.click(within(screen.getByRole('alert')).getByRole('button', { name: 'Make the shopping list' }))
+    expect(await screen.findByRole('status')).toHaveTextContent("Made this week's Supply run from the plan.")
+
+    // Once made, it is not said again to be unmade.
+    fireEvent.click(screen.getByRole('link', { name: 'Shopping list · 28' }))
+    fireEvent.click(await screen.findByRole('link', { name: 'Back to the Plan' }))
+    expect(await screen.findByRole('link', { name: 'Shopping list · 28' })).toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    expect(screen.queryByRole('button', { name: 'Make the shopping list' })).not.toBeInTheDocument()
+  })
+
+  it('still says the Supply run could not be made when making the shopping list fails after leaving the week', async () => {
+    const made = deferred()
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`GET ${NEXT_WEEK}`]: () => errorResponse(404, 'not_found'),
+      [`POST ${PUSH}`]: () => jsonResponse(200, syncedNow(SUPPLY_RUN_FAILED)),
+      'POST /api/v1/shopping/2026-10-05/generate': () => made.response,
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    fireEvent.click(within(await screen.findByRole('alert')).getByRole('button', { name: 'Make the shopping list' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent('Making the shopping list…')
+
+    // The week is left while the shopping list is being made, which fails.
+    fireEvent.click(screen.getByRole('button', { name: 'Next week' }))
+    expect(await screen.findByRole('button', { name: 'Draft this week' })).toBeInTheDocument()
+    await act(async () => made.send(errorResponse(500, 'internal')))
+
+    // Coming back, the Supply run is still said to be unmade, and can be
+    // made again.
+    fireEvent.click(screen.getByRole('button', { name: 'Previous week' }))
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Pushed to Calendar, but this week's Supply run couldn't be made.")
+    expect(within(alert).getByRole('button', { name: 'Make the shopping list' })).toBeEnabled()
+  })
+
+  it('no longer says the Supply run could not be made once the shopping list is made after leaving the week', async () => {
+    const made = deferred()
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`GET ${NEXT_WEEK}`]: () => errorResponse(404, 'not_found'),
+      [`POST ${PUSH}`]: () => jsonResponse(200, syncedNow(SUPPLY_RUN_FAILED)),
+      'POST /api/v1/shopping/2026-10-05/generate': () => made.response,
+    })
+    const queryClient = createQueryClient()
+    await renderPage(queryClient)
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    fireEvent.click(within(await screen.findByRole('alert')).getByRole('button', { name: 'Make the shopping list' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent('Making the shopping list…')
+
+    // The push is kept while the week is left, until the list is made: it
+    // is then settled, not merely swept with the week.
+    fireEvent.click(screen.getByRole('button', { name: 'Next week' }))
+    expect(await screen.findByRole('button', { name: 'Draft this week' })).toBeInTheDocument()
+    expect(pushesKept(queryClient)).toBe(1)
+    await act(async () => made.send(jsonResponse(200, { ...supplyRun(28), skipped: [] })))
+    expect(pushesKept(queryClient)).toBe(0)
+
+    fireEvent.click(screen.getByRole('button', { name: 'Previous week' }))
+    expect(await screen.findByText('Beef tacos')).toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    expect(screen.queryByRole('button', { name: 'Make the shopping list' })).not.toBeInTheDocument()
+  })
+
+  it('no longer says the Supply run could not be made once the shopping list is made on the Supply run screen', async () => {
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`POST ${PUSH}`]: () => jsonResponse(200, syncedNow(SUPPLY_RUN_FAILED)),
+      'POST /api/v1/shopping/2026-10-05/generate': () => jsonResponse(200, { ...supplyRun(28), skipped: [] }),
+    })
+    const queryClient = createQueryClient()
+    await renderPage(queryClient, <SupplyRunScreen />)
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent("Pushed to Calendar, but this week's Supply run couldn't be made.")
+
+    // The list is made on the Supply run screen, not from the Plan's alert.
+    fireEvent.click(screen.getByRole('link', { name: 'Shopping list' }))
+    fireEvent.click(await screen.findByRole('button', { name: 'Make the shopping list' }))
+    await waitFor(() => expect(screen.queryByRole('button', { name: 'Make the shopping list' })).not.toBeInTheDocument())
+    expect(pushesKept(queryClient)).toBe(0)
+
+    fireEvent.click(screen.getByRole('link', { name: 'Back to the Plan' }))
+    expect(await screen.findByRole('link', { name: 'Shopping list · 28' })).toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    expect(screen.queryByRole('button', { name: 'Make the shopping list' })).not.toBeInTheDocument()
+  })
+
+  it('still says the Supply run could not be made when making it on the Supply run screen fails', async () => {
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`POST ${PUSH}`]: () => jsonResponse(200, syncedNow(SUPPLY_RUN_FAILED)),
+      'POST /api/v1/shopping/2026-10-05/generate': () => errorResponse(500, 'internal'),
+    })
+    const queryClient = createQueryClient()
+    await renderPage(queryClient, <SupplyRunScreen />)
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Looks good — push to Calendar' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent("Pushed to Calendar, but this week's Supply run couldn't be made.")
+
+    fireEvent.click(screen.getByRole('link', { name: 'Shopping list' }))
+    fireEvent.click(await screen.findByRole('button', { name: 'Make the shopping list' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent("Couldn't make the shopping list.")
+    expect(pushesKept(queryClient)).toBe(1)
+
+    fireEvent.click(screen.getByRole('link', { name: 'Back to the Plan' }))
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Pushed to Calendar, but this week's Supply run couldn't be made.")
+    expect(within(alert).getByRole('button', { name: 'Make the shopping list' })).toBeEnabled()
+  })
+
   it('pushes nothing again until the changed plan is read and shown', async () => {
     let read: () => Response | Promise<Response> = () => jsonResponse(200, planBody('draft'))
     let push = () => errorResponse(409, 'plan_changed')
@@ -729,6 +1034,85 @@ describe('PlanPage', () => {
     expect(screen.queryByTestId('skeleton-tile')).not.toBeInTheDocument()
   })
 
+  it("links to the week's Supply run under the Draft board, saying how many items are still to buy", async () => {
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      'GET /api/v1/shopping/2026-10-05': () => jsonResponse(200, supplyRun(19)),
+    })
+    await renderPage()
+
+    const shopping = await screen.findByRole('link', { name: 'Shopping list · 19' })
+    expect(shopping).toHaveAttribute('href', '/plan/shopping?week=2026-10-05')
+    expect(declaredStyle(shopping).color).toBe('var(--color-accent-700)')
+    // It follows the push button and the sync status.
+    const push = screen.getByRole('button', { name: 'Looks good — push to Calendar' })
+    expect(push.compareDocumentPosition(shopping) & Node.DOCUMENT_POSITION_FOLLOWING).toBeTruthy()
+    fireEvent.click(shopping)
+    expect(await screen.findByText('Opened /plan/shopping?week=2026-10-05')).toBeInTheDocument()
+  })
+
+  it("shows a failed read of the week's shopping list with Retry, the link still opening the Supply run", async () => {
+    let failing = true
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      'GET /api/v1/shopping/2026-10-05': () => (failing ? errorResponse(500, 'internal') : jsonResponse(200, supplyRun(19))),
+    })
+    await renderPage()
+
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't load this week's shopping list. internal message")
+    expect(screen.getByRole('link', { name: 'Shopping list' })).toHaveAttribute('href', '/plan/shopping?week=2026-10-05')
+    // Retry reads it again.
+    failing = false
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    const shopping = await screen.findByRole('link', { name: 'Shopping list · 19' })
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    expect(fetchMock.mock.calls.filter(([input]) => String(input) === '/api/v1/shopping/2026-10-05')).toHaveLength(2)
+    fireEvent.click(shopping)
+    expect(await screen.findByText('Opened /plan/shopping?week=2026-10-05')).toBeInTheDocument()
+  })
+
+  it("drops the count when reading the week's shopping list again fails, showing the failure with Retry", async () => {
+    let failing = false
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      'GET /api/v1/shopping/2026-10-05': () => (failing ? errorResponse(500, 'internal') : jsonResponse(200, supplyRun(19))),
+    })
+    await renderPage()
+    expect(await screen.findByRole('link', { name: 'Shopping list · 19' })).toBeInTheDocument()
+
+    // Coming back to the page once the Supply run is stale reads it again,
+    // and that read fails.
+    failing = true
+    vi.setSystemTime(new Date('2026-10-07T16:01:00Z'))
+    act(() => {
+      window.dispatchEvent(new Event('visibilitychange'))
+    })
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't load this week's shopping list. internal message")
+    expect(screen.getByRole('link', { name: 'Shopping list' })).toHaveAttribute('href', '/plan/shopping?week=2026-10-05')
+    expect(screen.queryByRole('link', { name: 'Shopping list · 19' })).not.toBeInTheDocument()
+    // Retry reads it again, and the count is back.
+    failing = false
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    expect(await screen.findByRole('link', { name: 'Shopping list · 19' })).toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('links to the Supply run with no count while the week has no shopping list', async () => {
+    const fetchMock = stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')) })
+    await renderPage()
+
+    expect(await screen.findByText('Beef tacos')).toBeInTheDocument()
+    await waitFor(() => expect(fetchMock.mock.calls.map(([input]) => String(input))).toContain('/api/v1/shopping/2026-10-05'))
+    const shopping = screen.getByRole('link', { name: 'Shopping list' })
+    expect(shopping).toHaveAttribute('href', '/plan/shopping?week=2026-10-05')
+    // No list is not a failure.
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    fireEvent.click(shopping)
+    expect(await screen.findByText('Opened /plan/shopping?week=2026-10-05')).toBeInTheDocument()
+  })
+
   it('moves between weeks with the previous and next week buttons', async () => {
     stubServer({
       [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
@@ -1026,11 +1410,11 @@ describe.each([
     expect(screen.getByRole('button', { name: 'Next week' })).toBeInTheDocument()
     expect(screen.queryByRole('button', { name: 'This week' }) !== null).toBe(layout === 'desktop')
 
-    // Actions: the shopping list unavailable, saying why; Rebuild week
+    // Actions: the shopping list, with no count while the week has no
-    // outlined and Push to Calendar primary, both working.
+    // Supply run, and Rebuild week outlined; Push to Calendar primary.
-    const shopping = screen.getByRole('button', { name: 'Shopping list' })
+    const shopping = await screen.findByRole('link', { name: 'Shopping list' })
-    expect(shopping).toHaveAttribute('aria-disabled', 'true')
+    expect(shopping).not.toHaveAttribute('aria-disabled')
-    expect(shopping).toHaveAccessibleDescription('The shopping list arrives once the Supply run is built.')
+    expect(shopping).not.toHaveAccessibleDescription()
     const push = screen.getByRole('button', { name: 'Push to Calendar' })
     expect(push).toBeEnabled()
     expect(push).not.toHaveAttribute('aria-disabled')
@@ -1038,7 +1422,6 @@ describe.each([
     const rebuild = screen.getByRole('button', { name: 'Rebuild week' })
     expect(rebuild).toBeEnabled()
     expect(declaredStyle(rebuild).borderColor).toBe('var(--color-neutral-300)')
-    fireEvent.click(shopping)
     expect(posts(fetchMock)).toEqual([])
     // Mobile's own pieces are not shown.
     expect(screen.queryByRole('button', { name: 'Looks good — push to Calendar' })).not.toBeInTheDocument()
@@ -1098,6 +1481,48 @@ describe.each([
     expect(status).toHaveTextContent('Synced to Google Calendar 1 hr ago')
   })
 
+  it("shows a failed read of the week's shopping list with Retry, the action still opening the Supply run", async () => {
+    let failing = true
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      'GET /api/v1/shopping/2026-10-05': () => (failing ? errorResponse(500, 'internal') : jsonResponse(200, supplyRun(28))),
+      ...lists,
+    })
+    await renderPage()
+
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't load this week's shopping list. internal message")
+    expect(screen.getByText('Spaghetti bolognese')).toBeInTheDocument()
+    expect(screen.getByRole('link', { name: 'Shopping list' })).toHaveAttribute('href', '/plan/shopping?week=2026-10-05')
+    failing = false
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    const shopping = await screen.findByRole('link', { name: 'Shopping list · 28' })
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    fireEvent.click(shopping)
+    expect(await screen.findByText('Opened /plan/shopping?week=2026-10-05')).toBeInTheDocument()
+  })
+
+  it("opens the week's Supply run from the Shopping list action, saying how many items are still to buy", async () => {
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
+      [`GET ${NEXT_WEEK}`]: () => errorResponse(404, 'not_found'),
+      'GET /api/v1/shopping/2026-10-05': () => jsonResponse(200, supplyRun(28)),
+      ...lists,
+    })
+    await renderPage()
+
+    const shopping = await screen.findByRole('link', { name: 'Shopping list · 28' })
+    expect(shopping).toHaveAttribute('href', '/plan/shopping?week=2026-10-05')
+    expect(declaredStyle(shopping).borderColor).toBe('var(--color-neutral-300)')
+    // Another week's action opens that week's, which has no list yet.
+    fireEvent.click(screen.getByRole('button', { name: 'Next week' }))
+    expect(await screen.findByRole('heading', { level: 1, name: 'Oct 12 – 18' })).toBeInTheDocument()
+    expect(screen.getByRole('link', { name: 'Shopping list' })).toHaveAttribute('href', '/plan/shopping?week=2026-10-12')
+    fireEvent.click(screen.getByRole('button', { name: 'Previous week' }))
+    fireEvent.click(await screen.findByRole('link', { name: 'Shopping list · 28' }))
+    expect(await screen.findByText('Opened /plan/shopping?week=2026-10-05')).toBeInTheDocument()
+  })
+
   it('says changes to a pushed plan are not on Google Calendar', async () => {
     stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('changed')), ...lists })
     await renderPage()

web/src/plan/PlanPage.tsx

@@ -7,8 +7,10 @@ import { QUEST_LOG_KEY } from '../discover/api.ts'
 import { Confirm } from '../settings/LeaveGuard.tsx'
 import { methodLabels } from '../settings/RegularsSettingsPage.tsx'
 import { formatClockTime, useHouseholdSettings } from '../settings/api.ts'
+import { supplyRunScreen, useGenerateSupplyRun, useSupplyRun } from '../shopping/api.ts'
 import { useBreakpoint, type Breakpoint } from '../shell/useBreakpoint.ts'
 import { Button, type ButtonVariant } from '../ui/Button.tsx'
+import buttonStyles from '../ui/Button.module.css'
 import { EmptyState } from '../ui/EmptyState.tsx'
 import { ErrorBanner } from '../ui/ErrorBanner.tsx'
 import { Icon } from '../ui/Icon.tsx'
@@ -29,6 +31,7 @@ import {
   type PlanDay,
   type PlanDinner,
   type PlanStatus,
+  type PushedSupplyRun,
   type Swap,
 } from './api.ts'
 import { DragAnnouncer, DROP_DATE, DropBoard, PlanDragProvider, useDropTarget } from './drag.tsx'
@@ -79,10 +82,6 @@ const settingsFailures: Record<string, { reason: string; fix: string }> = {
   },
 }
 
-// SHOPPING_HINT is why the shopping list is unavailable.
-// TODO(Feature 17): open the Supply run, with its count, once it is built.
-const SHOPPING_HINT = 'The shopping list arrives once the Supply run is built.'
-
 // syncStatuses is the plan manager's line on whether the plan is on Calendar.
 const syncStatuses: Record<PlanStatus, string> = {
   draft: 'Not pushed to Google Calendar yet',
@@ -90,6 +89,13 @@ const syncStatuses: Record<PlanStatus, string> = {
   changed: 'Changes not pushed to Google Calendar',
 }
 
+// supplyRunOutcomes says what became of the week's Supply run after a push
+// that made it or left it as it was.
+const supplyRunOutcomes: Record<Exclude<PushedSupplyRun['status'], 'failed'>, string> = {
+  generated: "Made this week's Supply run from the plan.",
+  archived: "This week's Supply run is in the Supply archive, so it was left as it was.",
+}
+
 // duration is minutes as the plan manager's cards say it: "45 min", "6 hr",
 // "1 hr 30 min", with no-break spaces so a narrow card wraps the line
 // between the method and the duration, never inside the duration.
@@ -195,6 +201,22 @@ function DayColumn({ day, timezone, swapping, onSwap }: { day: PlanDay; timezone
   )
 }
 
+// ShoppingList opens the week's Supply run: an outline action in the plan
+// manager's header, a grape link under the Draft board on mobile. Once the
+// week has a Supply run it says how many items are still to buy, "Shopping
+// list · 28"; until then, while that is read, or when reading it failed, it
+// says no count, and the Supply run screen offers to make the list or shows
+// the failure.
+function ShoppingList({ weekStart, neededCount, layout }: { weekStart: string; neededCount: number | undefined; layout: Breakpoint }) {
+  const className = layout === 'mobile' ? styles.shoppingLink : [buttonStyles.button, buttonStyles.outline, styles.action].join(' ')
+  return (
+    <Link to={supplyRunScreen(weekStart)} className={className}>
+      <Icon icon={ShoppingCart} size="inline" />
+      {neededCount !== undefined ? `Shopping list · ${neededCount}` : 'Shopping list'}
+    </Link>
+  )
+}
+
 // SkeletonTiles stands in for the seven days while the plan loads or the AI
 // drafts it, as two columns of tiles on mobile and seven columns wider.
 function SkeletonTiles({ label, layout, children }: { label: string; layout: Breakpoint; children?: string }) {
@@ -217,13 +239,16 @@ function SkeletonTiles({ label, layout, children }: { label: string; layout: Bre
 // the plan is read again. Rebuilding a plan pushed to Calendar asks first,
 // and sends confirm. A failed draft is shown with Retry; no plan is made up.
 //
-// From tablet up it is the plan manager (mocks 2c, 2d): Rebuild week, Push to
+// From tablet up it is the plan manager (mocks 2c, 2d): Shopping list,
-// Calendar and the unavailable Shopping list are actions in the header,
+// Rebuild week and Push to Calendar are actions in the header, over the
-// over the plan's sync status and the 7-column grid.
+// plan's sync status and the 7-column grid. On mobile the Shopping list
+// link sits under the push button.
 //
 // Push to Calendar, on either layout, sends the plan shown and shows it as
 // synced once the server answers; a failure says why, linking to the Google
-// Calendar settings when only they can fix it.
+// Calendar settings when only they can fix it. What became of the week's
+// Supply run is said too: made, left as it was in the Supply archive, or
+// not made, with the way to make it.
 function WeekBoard({
   weekStart,
   timezone,
@@ -243,6 +268,9 @@ function WeekBoard({
   const [confirming, setConfirming] = useState(false)
   const swap = useSwapDay(weekStart)
   const push = usePushToCalendar(weekStart)
+  const run = useSupplyRun(weekStart)
+  // Makes the week's Supply run again after a push could not make it.
+  const generate = useGenerateSupplyRun(weekStart)
   const pushing = push.pending
   // The date of the day being swapped, while the swap sheet is open.
   const [swappingDate, setSwappingDate] = useState<string | null>(null)
@@ -312,6 +340,7 @@ function WeekBoard({
     if (!canPush) return
     swap.dismiss()
     push.reset()
+    generate.reset()
     push.mutate()
   }
 
@@ -323,6 +352,7 @@ function WeekBoard({
     setJobId(null)
     swap.dismiss()
     push.reset()
+    generate.reset()
     mutate(
       { weekStart, confirm },
       {
@@ -341,8 +371,33 @@ function WeekBoard({
     else start(false)
   }
 
+  const retryPush = cached ? () => void plan.refetch() : pushToCalendar
+  // makeShoppingList makes the week's Supply run again after a push could
+  // not make it. Once made, here or on the Supply run screen, the push is
+  // settled (useGenerateSupplyRun). A failure is the mutation's state, which
+  // generate.error reports.
+  function makeShoppingList() {
+    generate.mutate()
+  }
+  // A push's Supply run made again on the Plan stands for the push's, which
+  // is settled.
+  const supplyRun: PushedSupplyRun | null = generate.isSuccess ? { status: 'generated', error: null } : push.supplyRun
   const failure = push.error !== null ? (
-    <PushFailure error={push.error} cached={cached} onRetry={cached ? () => void plan.refetch() : pushToCalendar} />
+    <PushFailure error={push.error} cached={cached} onRetry={retryPush} />
+  ) : supplyRun?.status === 'failed' ? (
+    supplyRun.error.code === 'plan_changed' ? (
+      <ErrorBanner onRetry={retryPush}>
+        Pushed to Calendar, but the plan changed before its Supply run was made, so no shopping list was made from it; push
+        it again.
+      </ErrorBanner>
+    ) : (
+      <ErrorBanner onRetry={generate.isPending ? undefined : makeShoppingList} retryLabel="Make the shopping list">
+        Pushed to Calendar, but this week's Supply run couldn't be made.
+        {generate.isPending
+          ? ' Making the shopping list…'
+          : generate.isError && ` Couldn't make the shopping list. ${generate.error.message}`}
+      </ErrorBanner>
+    )
   ) : swap.failed !== null ? (
     <ErrorBanner onRetry={() => swapIn(swap.failed!.swap)}>
       Couldn't swap {weekdayName(swap.failed.swap.date)}'s dinner. {swap.failed.error.message}
@@ -360,11 +415,27 @@ function WeekBoard({
   ) : (
     <ErrorBanner onRetry={job.poll}>Couldn't check on the draft. {job.error.message}</ErrorBanner>
   )
+  const pushed = supplyRun !== null && supplyRun.status !== 'failed' && (
+    <p role="status" className={styles.pushed}>
+      {supplyRunOutcomes[supplyRun.status]}
+    </p>
+  )
+  // A failed read of the week's Supply run is shown, with Retry, after the
+  // Draft board's Shopping list link or under the plan manager's board; the
+  // Shopping list action still opens the Supply run. The count is that of a
+  // successful read only: a failed refetch keeps the earlier Supply run in
+  // run.data, and its count is then no longer current.
+  const neededCount = run.isSuccess ? run.data?.needed_count : undefined
+  const shoppingList = <ShoppingList weekStart={weekStart} neededCount={neededCount} layout={layout} />
+  const supplyRunFailure = run.isError && (
+    <ErrorBanner onRetry={() => void run.refetch()}>Couldn't load this week's shopping list. {run.error.message}</ErrorBanner>
+  )
 
   // swapIn sends the swap chosen in the sheet and closes it.
   function swapIn(chosen: Swap) {
     setSwappingDate(null)
     push.reset()
+    generate.reset()
     swap.mutate(chosen)
   }
   // dropIn swaps in a dinner dragged onto a day. A drag is not picked up,
@@ -462,6 +533,8 @@ function WeekBoard({
             {pushing ? 'Pushing to Calendar…' : 'Looks good — push to Calendar'}
           </Button>
           <SyncStatus plan={plan.data} className={styles.mobileStatus} />
+          {shoppingList}
+          {supplyRunFailure}
           {sheet}
         </>
       )
@@ -493,10 +566,7 @@ function WeekBoard({
         <div className={styles.actionBar}>
           {plan.data ? <SyncStatus plan={plan.data} /> : <span className={styles.status} />}
           <div className={styles.actions}>
-            <Unavailable hint={SHOPPING_HINT} variant="outline" below className={styles.action}>
+            {shoppingList}
-              <Icon icon={ShoppingCart} size="inline" />
-              Shopping list
-            </Unavailable>
             <Button
               variant="outline"
               className={styles.action}
@@ -537,6 +607,8 @@ function WeekBoard({
       {header}
       {body}
       {failure}
+      {pushed}
+      {layout !== 'mobile' && supplyRunFailure}
       <Confirm
         open={confirming}
         title="Rebuild this week?"
@@ -600,10 +672,10 @@ function PushFailure({ error, cached, onRetry }: { error: Error; cached: boolean
   )
 }
 
-// Unavailable is an action with nothing behind it yet (the shopping list):
+// Unavailable is an action with nothing behind it yet (Send to Google
-// it stays focusable, so a tap or focus shows the tooltip saying why, above
+// Chat): it stays focusable, so a tap or focus shows the tooltip saying
-// it or, at the top of the page, below.
+// why, above it or, at the top of the page, below.
-function Unavailable({
+export function Unavailable({
   hint,
   variant = 'primary',
   below = false,

web/src/plan/api.test.tsx

@@ -10,6 +10,21 @@ import { planKey, usePlan, usePushToCalendar, useSwapDay, type Plan, type PushTo
 
 const WEEK = '2026-10-05'
 const PLAN = `/api/v1/plans/${WEEK}`
+
+// GENERATED is a push answer's Supply run when the push made it.
+const GENERATED = { supply_run: { status: 'generated', error: null } }
+
+// SUPPLY_RUN_FAILED is a push answer's Supply run when it could not be made.
+const SUPPLY_RUN_FAILED = {
+  supply_run: {
+    status: 'failed',
+    error: {
+      code: 'supply_run_failed',
+      message: 'the plan is on Calendar, but its Supply run could not be made; make it again from the Supply run',
+      retryable: true,
+    },
+  },
+}
 const MONDAY = `${PLAN}/days/2026-10-05`
 const FRIDAY = `${PLAN}/days/2026-10-09`
 const DAYS = ['2026-10-05', '2026-10-06', '2026-10-07', '2026-10-08', '2026-10-09', '2026-10-10', '2026-10-11']
@@ -318,7 +333,7 @@ describe('week mutations', () => {
 
     // The push succeeds while the third week is shown: it is left behind,
     // and the week's pending swap is not.
-    await act(async () => nextPush.send(jsonResponse(200, { ...planBody(), week_start: NEXT })))
+    await act(async () => nextPush.send(jsonResponse(200, { ...planBody(), week_start: NEXT, ...GENERATED })))
     await waitFor(() => expect(weekMutations(queryClient, NEXT)).toEqual([]))
     expect(weekMutations(queryClient, WEEK)).toEqual(['swap pending', 'swap success'])
 
@@ -338,6 +353,43 @@ describe('week mutations', () => {
     expect(weekMutations(queryClient, LATER)).toEqual([])
   })
 
+  it('keeps a push whose Supply run was not made, settled in a week no longer shown, to be shown on coming back', async () => {
+    const nextPush = deferred()
+    stubServer({
+      [`GET ${PLAN}`]: () => jsonResponse(200, planBody()),
+      [`GET /api/v1/plans/${NEXT}`]: () => jsonResponse(200, { ...planBody(), week_start: NEXT }),
+      [`POST /api/v1/plans/${NEXT}/push-calendar`]: () => nextPush.reply,
+    })
+    const api = createApiClient(fakeLocation('/plan'), createNetworkStatus(window), createVerifiedSession(localStorage))
+    await api.loadMe()
+    const queryClient = createQueryClient()
+    const wrapper = ({ children }: { children: ReactNode }) => (
+      <ApiProvider client={api}>
+        <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
+      </ApiProvider>
+    )
+    const hook = renderHook(({ week }) => ({ plan: usePlan(week), push: usePushToCalendar(week) }), {
+      wrapper,
+      initialProps: { week: NEXT },
+    })
+    await waitFor(() => expect(hook.result.current.plan.isSuccess).toBe(true))
+
+    // The push is pushed to Calendar while another week is shown, but its
+    // Supply run is not made: it stays, though it succeeded.
+    act(() => hook.result.current.push.mutate())
+    hook.rerender({ week: WEEK })
+    await waitFor(() => expect(hook.result.current.plan.isSuccess).toBe(true))
+    const synced = { ...planBody(), week_start: NEXT, status: 'synced', calendar_synced_at: '2026-10-08T06:00:00Z' }
+    await act(async () => nextPush.send(jsonResponse(200, { ...synced, ...SUPPLY_RUN_FAILED })))
+    await waitFor(() => expect(weekMutations(queryClient, NEXT)).toEqual(['push success']))
+
+    // Coming back mounts the week's board again, as the Plan's does.
+    hook.unmount()
+    const back = renderHook(() => usePushToCalendar(NEXT), { wrapper })
+    expect(back.result.current.error).toBeNull()
+    expect(back.result.current.supplyRun).toEqual(SUPPLY_RUN_FAILED.supply_run)
+  })
+
   it('leaves behind what settles once Plan is left for another route, and keeps what is pending', async () => {
     const friday = deferred()
     const monday = deferred()
@@ -394,7 +446,7 @@ describe('week mutations', () => {
     // The push succeeds: the plan as synced is recorded, and the push is
     // left behind.
     const synced = { ...planBody(), status: 'synced', calendar_synced_at: '2026-10-08T06:00:00Z' }
-    await act(async () => push.send(jsonResponse(200, synced)))
+    await act(async () => push.send(jsonResponse(200, { ...synced, ...GENERATED })))
     await waitFor(() => expect(weekMutations(queryClient, WEEK)).toEqual([]))
     expect(queryClient.getQueryData<Plan>(planKey(WEEK))).toMatchObject({ status: 'synced', calendar_synced_at: new Date('2026-10-08T06:00:00Z') })
   })

web/src/plan/api.ts

@@ -5,6 +5,7 @@ import { isRecord } from '../api/errors.ts'
 import { METHODS, oneOf, photoId, type Method } from '../dinners/api.ts'
 import { QUEST_LOG_KEY } from '../discover/api.ts'
 import { noteGoogleFailure } from '../settings/calendarApi.ts'
+import { supplyRunKey } from '../shopping/api.ts'
 
 export const PLANS_PATH = '/api/v1/plans'
 
@@ -114,6 +115,56 @@ function parsePlan(where: string, weekStart: string, body: unknown, cached: bool
   }
 }
 
+// SupplyRunError is the API error a Push to Calendar's Supply run carries
+// when it was not generated.
+export type SupplyRunError<C extends string> = { code: C; message: string; retryable: boolean }
+
+// PushedSupplyRun says whether a Push to Calendar made the week's Supply
+// run: generated when it did; archived when the week's Supply run is in the
+// Supply archive and was left as it was; or failed when it was not made.
+// A failed one's error is plan_changed when the plan was edited after it
+// was pushed, and pushing again makes it, or supply_run_failed when it
+// could not be made, and making the shopping list again does.
+export type PushedSupplyRun =
+  | { status: 'generated'; error: null }
+  | { status: 'archived'; error: SupplyRunError<'archived'> }
+  | { status: 'failed'; error: SupplyRunError<'plan_changed' | 'supply_run_failed'> }
+
+// PushedPlan is the POST /api/v1/plans/{weekStart}/push-calendar answer:
+// the plan as synced, and what became of the week's Supply run.
+export type PushedPlan = { plan: Plan; supply_run: PushedSupplyRun }
+
+const PUSHED_SUPPLY_RUN_STATUSES = ['generated', 'archived', 'failed'] as const
+const FAILED_SUPPLY_RUN_CODES = ['plan_changed', 'supply_run_failed'] as const
+
+function parseSupplyRunError<C extends string>(where: string, codes: readonly C[], body: unknown): SupplyRunError<C> {
+  if (!isRecord(body) || typeof body.message !== 'string' || typeof body.retryable !== 'boolean') {
+    throw new Error(`${where}: supply_run has an error that is not an API error`)
+  }
+  return { code: oneOf(where, 'supply_run.error.code', codes, body.code), message: body.message, retryable: body.retryable }
+}
+
+function parsePushedSupplyRun(where: string, body: unknown): PushedSupplyRun {
+  if (!isRecord(body)) throw new Error(`${where}: response has no supply_run`)
+  const status = oneOf(where, 'supply_run.status', PUSHED_SUPPLY_RUN_STATUSES, body.status)
+  switch (status) {
+    case 'generated':
+      if (body.error !== null) throw new Error(`${where}: a generated supply_run has an error`)
+      return { status, error: null }
+    case 'archived':
+      return { status, error: parseSupplyRunError(where, ['archived'] as const, body.error) }
+    case 'failed':
+      return { status, error: parseSupplyRunError(where, FAILED_SUPPLY_RUN_CODES, body.error) }
+  }
+}
+
+function parsePushedPlan(where: string, weekStart: string, body: unknown): PushedPlan {
+  return {
+    plan: parsePlan(where, weekStart, body, false),
+    supply_run: parsePushedSupplyRun(where, isRecord(body) ? body.supply_run : undefined),
+  }
+}
+
 // parseDraftResult checks a draft_week job's result, which useJob passes on
 // unread, is the draft of the week starting on weekStart.
 export function parseDraftResult(where: string, weekStart: string, body: unknown): DraftResult {
@@ -178,6 +229,19 @@ function sameDay(a: PlanDay, b: PlanDay): boolean {
   )
 }
 
+// failed says whether a swap or push failed: a push whose Supply run was
+// not made failed too, though Calendar has the plan.
+function failed(mutation: Mutation): boolean {
+  return mutation.state.status === 'error' || unmade(mutation)
+}
+
+// unmade says whether a push succeeded but its Supply run was not made: the
+// week is on Calendar with no shopping list until one is made.
+function unmade(mutation: Mutation): boolean {
+  const data = mutation.state.data as PushedPlan | undefined
+  return mutation.state.status === 'success' && weekMutation(mutation)?.kind === 'push' && data?.supply_run.status === 'failed'
+}
+
 // weekMutation is the kind and week of a swap or push of a week the mutation
 // cache keeps for it, or null for any other mutation.
 function weekMutation(mutation: Mutation): { kind: 'swap' | 'push'; week: string } | null {
@@ -203,9 +267,13 @@ const weeksShown = new WeakMap<QueryClient, WeeksShown>()
 // earlier pending one must see, stay across leaving its week and coming
 // back. When one settles, the same is done, except that a week's latest,
 // when it failed, stays until a week is next shown, so that coming straight
-// back to it shows the failure. The cache holds at most the weeks shown's,
+// back to it shows the failure. A week's latest push whose Supply run was
-// those of weeks left pending, and one failure of each week whose last
+// not made stays whatever is shown: the week has no shopping list until one
-// pending one settled since a week was last shown.
+// is made, which settles the push, or a push sent since replaces it, and
+// making it may still be under way when the week is left. The cache holds
+// at most the weeks shown's, those of weeks left pending, one push of each
+// week whose Supply run was not made, and one failure of each week whose
+// last pending one settled since a week was last shown.
 function keepWeekMutations(queryClient: QueryClient): WeeksShown {
   const kept = weeksShown.get(queryClient)
   if (kept !== undefined) return kept
@@ -225,7 +293,7 @@ function keepWeekMutations(queryClient: QueryClient): WeeksShown {
       if (week.some((mutation) => mutation.state.status === 'pending')) continue
       const latest = week.at(-1)
       for (const mutation of week) {
-        if (settled && mutation === latest && mutation.state.status === 'error') continue
+        if (mutation === latest && (unmade(mutation) || (settled && failed(mutation)))) continue
         mutations.remove(mutation)
       }
     }
@@ -363,10 +431,12 @@ function pushKey(weekStart: string) {
 }
 
 // PushToCalendar is the push of one week, as the mutation cache holds it:
-// whether it is pending, and why the latest failed, if it failed.
+// whether it is pending, why the latest failed, if it failed, and what
+// became of the week's Supply run, if it succeeded.
 export type PushToCalendar = {
   pending: boolean
   error: Error | null
+  supplyRun: PushedSupplyRun | null
   mutate: () => void
   reset: () => void
 }
@@ -380,10 +450,19 @@ export type PushToCalendar = {
 // the one shown. One Google refused the grant for reads the Google Calendar
 // connection again, which is now reconnect required.
 //
+// Once pushed, the server makes the week's Supply run from the plan pushed
+// and answers with its outcome, which supplyRun reports: a failed one is
+// never a quiet success. The week's Supply run is read again, whatever the
+// outcome, so the list shown is the server's. A Supply run not made because
+// the plan was edited after it was pushed reads the plan again too, as a
+// push refused for that does.
+//
 // The week's pushes live in the mutation cache, not in the component, as its
 // swaps do, so leaving the week and coming back keeps one pending. reset
-// leaves settled pushes behind; it is refused while one is pending. Settled
+// leaves settled pushes behind; it is refused while one is pending. A push
-// pushes of a week no longer shown are left behind too
+// whose Supply run was not made is left behind once the list is made
+// (settleUnmadePushes). Settled pushes of a week no longer shown are left
+// behind too, but for the latest when its Supply run was not made
 // (keepWeekMutations).
 export function usePushToCalendar(weekStart: string): PushToCalendar {
   const { apiFetch } = useApi()
@@ -395,12 +474,17 @@ export function usePushToCalendar(weekStart: string): PushToCalendar {
   // The week's pushes, in the order sent.
   const pushes = useMutationState({
     filters: { mutationKey },
-    select: (mutation) => ({ status: mutation.state.status, error: mutation.state.error }),
+    select: (mutation) => ({
+      mutationId: mutation.mutationId,
+      status: mutation.state.status,
+      error: mutation.state.error,
+      data: mutation.state.data as PushedPlan | undefined,
+    }),
   })
   const latest = pushes.at(-1)
 
   function mutate() {
-    const mutation = mutations.build<Plan, Error, void, unknown>(queryClient, {
+    const mutation = mutations.build<PushedPlan, Error, void, unknown>(queryClient, {
       mutationKey,
       // Kept until reset or settled in a week not shown (keepWeekMutations):
       // a push pending in a week left must still be found when it is shown
@@ -408,9 +492,15 @@ export function usePushToCalendar(weekStart: string): PushToCalendar {
       gcTime: Infinity,
       mutationFn: async () => {
         const path = `${planPath(weekStart)}/push-calendar`
-        return parsePlan(`POST ${path}`, weekStart, await apiFetch<unknown>(path, { method: 'POST' }), false)
+        return parsePushedPlan(`POST ${path}`, weekStart, await apiFetch<unknown>(path, { method: 'POST' }))
+      },
+      onSuccess: async ({ plan, supply_run }) => {
+        queryClient.setQueryData<Plan>(key, plan)
+        void queryClient.invalidateQueries({ queryKey: supplyRunKey(weekStart) })
+        if (supply_run.error?.code === 'plan_changed') {
+          await queryClient.invalidateQueries({ queryKey: key, refetchType: 'all' })
+        }
       },
-      onSuccess: (plan) => queryClient.setQueryData<Plan>(key, plan),
       onError: async (error) => {
         noteGoogleFailure(queryClient, error)
         if (error instanceof ApiError && error.code === 'plan_changed') {
@@ -433,7 +523,26 @@ export function usePushToCalendar(weekStart: string): PushToCalendar {
   return {
     pending: pushes.some((push) => push.status === 'pending'),
     error: latest?.status === 'error' ? latest.error! : null,
+    supplyRun: latest?.status === 'success' ? latest.data!.supply_run : null,
     mutate,
     reset,
   }
 }
+
+// settleUnmadePushes is called as the Supply run of the week starting on
+// weekStart starts being made, from the Plan or the Supply run screen
+// (useGenerateSupplyRun). The function it answers with is called once the
+// list is made: it leaves behind the week's pushes sent before whose Supply
+// run was not made, so the Plan does not say again that it is unmade, even
+// if the Plan was left meanwhile. A push sent since is kept, and a list not
+// made leaves them as they are.
+export function settleUnmadePushes(queryClient: QueryClient, weekStart: string): () => void {
+  const mutations = queryClient.getMutationCache()
+  const mutationKey = pushKey(weekStart)
+  const sent = new Set(mutations.findAll({ mutationKey }))
+  return () => {
+    for (const mutation of mutations.findAll({ mutationKey })) {
+      if (sent.has(mutation) && unmade(mutation)) mutations.remove(mutation)
+    }
+  }
+}

web/src/shopping/SupplyArchivePage.module.css

@@ -0,0 +1,144 @@
+/* Supply archive · weekly posts (mock 1m, and the right panel of 2f). */
+.archive {
+  box-sizing: border-box;
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+  max-width: 560px;
+  padding-top: 8px;
+}
+
+.header {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.title {
+  margin: 0;
+  font-family: var(--font-heading);
+  font-size: 24px;
+  font-weight: 400;
+  line-height: 1.1;
+}
+
+.periods {
+  align-self: flex-start;
+}
+
+.period {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  margin-top: 6px;
+}
+
+.heading {
+  margin: 0;
+  font-family: var(--font-heading);
+  font-size: 18px;
+  font-weight: 400;
+  line-height: 1.2;
+}
+
+.posts {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.post {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  padding: 16px;
+  border-radius: 24px;
+  background: var(--color-surface);
+  color: var(--color-text);
+  text-decoration: none;
+}
+
+.post:focus-visible {
+  outline: 3px solid var(--color-accent);
+  outline-offset: 2px;
+}
+
+/* The current week's post: grape-100 with a grape-300 ring. */
+.current {
+  background: var(--color-accent-100);
+  box-shadow: inset 0 0 0 2px var(--color-accent-300);
+}
+
+/* The week label as the API writes it, capitalised here. */
+.kicker {
+  font-family: var(--font-body);
+  font-size: 11px;
+  font-weight: 700;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  color: var(--color-neutral-700);
+}
+
+.current .kicker {
+  color: var(--color-accent-700);
+}
+
+.postTitle {
+  font-family: var(--font-heading);
+  font-size: 18px;
+  line-height: 1.15;
+}
+
+.meta {
+  font-family: var(--font-body);
+  font-size: 13px;
+  color: var(--color-neutral-800);
+}
+
+.chips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+}
+
+.chip {
+  padding: 3px 10px;
+  border-radius: var(--radius-pill);
+  background: var(--color-bg);
+  font-family: var(--font-body);
+  font-size: 11px;
+  font-weight: 700;
+}
+
+.older {
+  align-self: center;
+}
+
+.skeletonPost {
+  height: 112px;
+  border-radius: 24px;
+}
+
+/* Desktop (mock 2f): the week's list at the left, the archive in a 340 px
+   panel at the right. */
+.split {
+  display: flex;
+  gap: 24px;
+  align-items: flex-start;
+}
+
+.list {
+  flex: 1;
+  min-width: 0;
+}
+
+.panel {
+  flex: none;
+  box-sizing: border-box;
+  width: 340px;
+  padding-left: 24px;
+  border-left: 1px solid var(--color-divider);
+}

web/src/shopping/SupplyArchivePage.test.tsx

@@ -0,0 +1,422 @@
+import { QueryClientProvider } from '@tanstack/react-query'
+import { fireEvent, render, screen, waitFor, within } from '@testing-library/react'
+import { MemoryRouter, Route, Routes } from 'react-router'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { ApiProvider, createApiClient, createQueryClient, createVerifiedSession } from '../api/index.ts'
+import { createNetworkStatus } from '../pwa/networkStatus.ts'
+import { HOUSEHOLD_SETTINGS } from '../test/ApiProviders.tsx'
+import { errorResponse, fakeLocation, jsonResponse, ME } from '../test/fetchStub.ts'
+import { mockViewport } from '../test/matchMedia.ts'
+import type { ArchivePost } from './api.ts'
+import { PAGE, SupplyArchivePage } from './SupplyArchivePage.tsx'
+import styles from './SupplyArchivePage.module.css'
+
+const ARCHIVE = (by: string) => `/api/v1/shopping/archive?by=${by}`
+
+// post is one Supply archive post as GET /api/v1/shopping/archive sends it.
+function post(weekStart: string, label: string, overrides: Partial<ArchivePost> = {}): ArchivePost {
+  return {
+    weekStart,
+    label,
+    title: null,
+    dinnerCount: 7,
+    itemCount: 23,
+    onHandCount: 4,
+    dinners: ['Beef tacos', 'Tikka masala', 'Pizza', 'Pot roast', 'Orzo', 'Chili', 'Salmon'],
+    current: false,
+    ...overrides,
+  }
+}
+
+// The posts of mock 1m: this week's titled post, then the weeks across the
+// September–October boundary and the 2025–2026 one, the last untitled.
+const WEEK_41 = post('2026-10-05', 'Week 41 · Oct 5 – 11', { title: 'Tacos, tikka & a salmon finale', current: true })
+const WEEK_40 = post('2026-09-28', 'Week 40 · Sep 28 – Oct 4', { title: 'Pizza, pot roast & the great orzo trial', itemCount: 26 })
+const WEEK_39 = post('2026-09-21', 'Week 39 · Sep 21 – 27', { title: 'Chili season opens', dinnerCount: 1, itemCount: 1, onHandCount: 0, dinners: ['Chili'] })
+const WEEK_1 = post('2025-12-29', 'Week 1 · Dec 29 – Jan 4')
+
+// The archive as the server groups it: by week each period is one ISO week
+// headed by its label; by month and year a week belongs to the period of its
+// Monday, so week 40 is September's and week 1 is 2025's.
+const BY = {
+  week: (
+    [
+      ['2026-W41', WEEK_41],
+      ['2026-W40', WEEK_40],
+      ['2026-W39', WEEK_39],
+      ['2026-W01', WEEK_1],
+    ] as const
+  ).map(([key, p]) => ({ key, heading: p.label, posts: [p] })),
+  month: [
+    { key: '2026-10', heading: 'October 2026', posts: [WEEK_41] },
+    { key: '2026-09', heading: 'September 2026', posts: [WEEK_40, WEEK_39] },
+    { key: '2025-12', heading: 'December 2025', posts: [WEEK_1] },
+  ],
+  year: [
+    { key: '2026', heading: '2026', posts: [WEEK_41, WEEK_40, WEEK_39] },
+    { key: '2025', heading: '2025', posts: [WEEK_1] },
+  ],
+}
+
+function archive(by: keyof typeof BY) {
+  return () => jsonResponse(200, { by, periods: BY[by] })
+}
+
+type Responder = (init: RequestInit | undefined) => Response | Promise<Response>
+
+// stubServer answers "METHOD path" requests from responders, with /me and
+// the household settings; any other request fails the test.
+function stubServer(responders: Record<string, Responder>) {
+  const all: Record<string, Responder> = {
+    'GET /api/v1/me': () => jsonResponse(200, ME),
+    'GET /api/v1/settings/household': () => jsonResponse(200, HOUSEHOLD_SETTINGS),
+    ...responders,
+  }
+  const fetchMock = vi.fn<typeof fetch>((input, init) => {
+    const key = `${init?.method ?? 'GET'} ${String(input)}`
+    const respond = Object.hasOwn(all, key) ? all[key] : undefined
+    if (respond === undefined) throw new Error(`unexpected fetch: ${key}`)
+    return Promise.resolve(respond(init))
+  })
+  vi.stubGlobal('fetch', fetchMock)
+  return fetchMock
+}
+
+// renderPage loads /me (for the CSRF token any write would need, so a
+// missing PATCH is not for want of it) and renders the Supply archive at path.
+async function renderPage(path = '/plan/shopping/archive') {
+  const api = createApiClient(fakeLocation(path), createNetworkStatus(window), createVerifiedSession(localStorage))
+  await api.loadMe()
+  return render(
+    <ApiProvider client={api}>
+      <QueryClientProvider client={createQueryClient()}>
+        <MemoryRouter initialEntries={[path]}>
+          <Routes>
+            <Route path="/plan/shopping/archive" element={<SupplyArchivePage />} />
+            <Route path="/plan/shopping" element={<p>Supply run screen</p>} />
+          </Routes>
+        </MemoryRouter>
+      </QueryClientProvider>
+    </ApiProvider>,
+  )
+}
+
+// postCard is the post titled title, a link.
+function postCard(title: string) {
+  return screen.getByText(title).closest('a')!
+}
+
+beforeEach(() => {
+  mockViewport(390)
+  vi.useFakeTimers({ toFake: ['Date'] })
+  vi.setSystemTime(new Date('2026-10-07T16:00:00Z'))
+})
+
+afterEach(() => {
+  vi.useRealTimers()
+  vi.unstubAllGlobals()
+  Reflect.deleteProperty(window, 'matchMedia')
+})
+
+describe('SupplyArchivePage', () => {
+  it('renders mock 1m by week: one post per week with its kicker, title, counts and dinner chips', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week') })
+    await renderPage()
+
+    expect(screen.getByRole('heading', { level: 1, name: 'Supply archive' })).toBeInTheDocument()
+    expect(screen.getByRole('radio', { name: 'Week' })).toBeChecked()
+    const card = await screen.findByText('Pizza, pot roast & the great orzo trial')
+    const post40 = card.closest('a')!
+    expect(within(post40).getByText('Week 40 · Sep 28 – Oct 4')).toHaveClass(styles.kicker!)
+    expect(post40).toHaveTextContent('7 dinners · 26 items · 4 already on hand')
+    expect(within(post40).getByText('Beef tacos')).toHaveClass(styles.chip!)
+    expect(within(post40).getByText('Tikka masala')).toHaveClass(styles.chip!)
+    expect(within(post40).getByText('+5')).toHaveClass(styles.chip!)
+    expect(within(post40).queryByText('Pizza')).not.toBeInTheDocument()
+    expect(postCard('Chili season opens')).toHaveTextContent('1 dinner · 1 item · 0 already on hand')
+    expect(within(postCard('Chili season opens')).queryByText(/^\+/)).not.toBeInTheDocument()
+
+    expect(screen.getAllByRole('link').map((link) => link.getAttribute('href'))).toEqual([
+      '/plan/shopping/archive?week=2026-10-05',
+      '/plan/shopping/archive?week=2026-09-28',
+      '/plan/shopping/archive?week=2026-09-21',
+      '/plan/shopping/archive?week=2025-12-29',
+    ])
+  })
+
+  it('renders by week the periods and headings the server sends, as sent', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week') })
+    await renderPage()
+    await screen.findByText('Chili season opens')
+
+    expect(screen.getAllByRole('heading', { level: 2 }).map((h) => h.textContent)).toEqual(BY.week.map((period) => period.heading))
+    expect(screen.getByRole('heading', { level: 2, name: WEEK_40.label })).toHaveClass(styles.heading!)
+    for (const period of BY.week) {
+      const section = screen.getByRole('region', { name: period.heading })
+      expect(within(section).getAllByRole('link').map((link) => link.getAttribute('href'))).toEqual(
+        period.posts.map((p) => `/plan/shopping/archive?week=${p.weekStart}`),
+      )
+    }
+  })
+
+  it('capitalises the week label kicker in CSS from the label as the API writes it', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week') })
+    await renderPage()
+    await screen.findByText('Chili season opens')
+    expect(within(postCard('Chili season opens')).getByText('Week 39 · Sep 21 – 27')).toHaveClass(styles.kicker!)
+  })
+
+  it.each([
+    ['Month', 'month', ['October 2026', 'September 2026', 'December 2025']],
+    ['Year', 'year', ['2026', '2025']],
+  ] as const)('groups by %s under the headings the server sends, across the month and year boundaries', async (label, by, headings) => {
+    const fetchMock = stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week'), [`GET ${ARCHIVE(by)}`]: archive(by) })
+    await renderPage()
+    await screen.findByText('Chili season opens')
+
+    fireEvent.click(screen.getByRole('radio', { name: label }))
+
+    await waitFor(() => expect(screen.getAllByRole('heading', { level: 2 }).map((h) => h.textContent)).toEqual(headings))
+    expect(screen.getByRole('heading', { level: 2, name: headings[0] })).toHaveClass(styles.heading!)
+    expect(fetchMock.mock.calls.map(([input]) => String(input))).toContain(ARCHIVE(by))
+    for (const period of BY[by]) {
+      const section = screen.getByRole('region', { name: period.heading })
+      expect(within(section).getAllByRole('link').map((link) => link.getAttribute('href'))).toEqual(
+        period.posts.map((p) => `/plan/shopping/archive?week=${p.weekStart}`),
+      )
+    }
+  })
+
+  it('highlights the current week’s post, by the API’s current, and no other', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week') })
+    await renderPage()
+
+    const current = (await screen.findByText('Tacos, tikka & a salmon finale')).closest('a')!
+    expect(current).toHaveClass(styles.current!)
+    expect(within(current).getByText('Week 41 · Oct 5 – 11 · Current')).toBeInTheDocument()
+    for (const title of ['Pizza, pot roast & the great orzo trial', 'Chili season opens']) {
+      expect(postCard(title)).not.toHaveClass(styles.current!)
+      expect(postCard(title)).not.toHaveTextContent('Current')
+    }
+  })
+
+  it('follows current from the API, not today’s date', async () => {
+    const past = { ...WEEK_40, current: true }
+    stubServer({ [`GET ${ARCHIVE('week')}`]: () => jsonResponse(200, { by: 'week', periods: [{ key: 'w', heading: past.label, posts: [{ ...WEEK_41, current: false }, past] }] }) })
+    await renderPage()
+
+    expect(await screen.findByText('Week 40 · Sep 28 – Oct 4 · Current')).toBeInTheDocument()
+    expect(postCard('Tacos, tikka & a salmon finale')).not.toHaveClass(styles.current!)
+  })
+
+  it('titles an untitled post with its week label', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week') })
+    await renderPage()
+
+    await screen.findByText('Chili season opens')
+    const untitled = screen.getByRole('link', { name: /Week 1 · Dec 29 – Jan 4/ })
+    const label = within(untitled).getAllByText('Week 1 · Dec 29 – Jan 4')
+    expect(label.map((el) => el.className)).toEqual([styles.kicker, styles.postTitle])
+  })
+
+  it(`shows ${PAGE} posts and "Load older" shows the next ${PAGE}, none twice and none skipped`, async () => {
+    const weeks = Array.from({ length: 2 * PAGE + 3 }, (_, i) => {
+      const monday = new Date(Date.UTC(2026, 9, 5 - 7 * i)).toISOString().slice(0, 10)
+      return post(monday, `Week of ${monday}`, { title: `Post ${i}` })
+    })
+    // By month, so the cut falls inside a period and its heading is shown once.
+    const periods = [
+      { key: 'a', heading: 'Newer', posts: weeks.slice(0, PAGE + 2) },
+      { key: 'b', heading: 'Older', posts: weeks.slice(PAGE + 2) },
+    ]
+    stubServer({
+      [`GET ${ARCHIVE('week')}`]: archive('week'),
+      [`GET ${ARCHIVE('month')}`]: () => jsonResponse(200, { by: 'month', periods }),
+    })
+    await renderPage()
+    await screen.findByText('Chili season opens')
+    fireEvent.click(screen.getByRole('radio', { name: 'Month' }))
+
+    const titles = () => screen.getAllByRole('link').map((link) => within(link).getByText(/^Post /).textContent)
+    await screen.findByText('Post 0')
+    expect(titles()).toEqual(weeks.slice(0, PAGE).map((p) => p.title))
+    expect(screen.getAllByRole('heading', { level: 2 }).map((h) => h.textContent)).toEqual(['Newer'])
+
+    fireEvent.click(screen.getByRole('button', { name: 'Load older' }))
+    expect(titles()).toEqual(weeks.slice(0, 2 * PAGE).map((p) => p.title))
+    expect(screen.getAllByRole('heading', { level: 2 }).map((h) => h.textContent)).toEqual(['Newer', 'Older'])
+
+    fireEvent.click(screen.getByRole('button', { name: 'Load older' }))
+    expect(titles()).toEqual(weeks.map((p) => p.title))
+    expect(screen.queryByRole('button', { name: 'Load older' })).not.toBeInTheDocument()
+  })
+
+  it('offers no "Load older" when every post is shown', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week') })
+    await renderPage()
+    await screen.findByText('Chili season opens')
+    expect(screen.queryByRole('button', { name: 'Load older' })).not.toBeInTheDocument()
+  })
+
+  it('shows skeleton posts while the archive loads', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: () => new Promise<Response>(() => {}) })
+    await renderPage()
+    expect(screen.getByLabelText('Supply archive loading')).toHaveAttribute('aria-busy', 'true')
+    expect(screen.getAllByTestId('skeleton-post')).toHaveLength(3)
+  })
+
+  it('says so when nothing is archived yet', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: () => jsonResponse(200, { by: 'week', periods: [] }) })
+    await renderPage()
+    expect(await screen.findByText('Nothing archived yet')).toBeInTheDocument()
+    expect(screen.queryByRole('button', { name: 'Load older' })).not.toBeInTheDocument()
+  })
+
+  it('reports a failed load and retries it', async () => {
+    let reads = 0
+    stubServer({
+      [`GET ${ARCHIVE('week')}`]: () => (++reads === 1 ? errorResponse(500, 'internal') : archive('week')()),
+    })
+    await renderPage()
+
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't load the Supply archive.")
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    expect(await screen.findByText('Chili season opens')).toBeInTheDocument()
+    expect(reads).toBe(2)
+  })
+
+  it('reports a response that is not the archive by the period asked for', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: () => jsonResponse(200, { by: 'month', periods: [] }) })
+    await renderPage()
+    expect(await screen.findByRole('alert')).toHaveTextContent(`GET ${ARCHIVE('week')}: response is not the Supply archive by week`)
+  })
+
+  it('goes back to the Supply run', async () => {
+    stubServer({ [`GET ${ARCHIVE('week')}`]: archive('week') })
+    await renderPage()
+    fireEvent.click(screen.getByRole('button', { name: 'Back to the Supply run' }))
+    expect(await screen.findByText('Supply run screen')).toBeInTheDocument()
+  })
+})
+
+// The frozen Supply run of week 40, as GET /api/v1/shopping/{weekStart}
+// sends it.
+const FROZEN = {
+  weekStart: '2026-09-28',
+  label: 'Week 40 · Sep 28 – Oct 4',
+  title: 'Pizza, pot roast & the great orzo trial',
+  status: 'archived',
+  sent_to_chat_at: null,
+  needed_count: 1,
+  total_count: 2,
+  groups: [
+    {
+      dinner: { id: 'd1', name: 'Friday pizza' },
+      date: '2026-10-02',
+      items: [
+        { id: 'i1', name: 'Pizza dough', qty: '2 balls', needed: true },
+        { id: 'i2', name: 'Mozzarella', qty: '1 lb', needed: false },
+      ],
+    },
+  ],
+}
+
+// The current week's Supply run, week 41, still current: the API's archive
+// includes it, highlighted.
+const CURRENT = {
+  ...FROZEN,
+  weekStart: '2026-10-05',
+  label: 'Week 41 · Oct 5 – 11',
+  title: 'Tacos, tikka & a salmon finale',
+  status: 'current',
+  groups: [
+    {
+      dinner: { id: 'd2', name: 'Beef tacos' },
+      date: '2026-10-05',
+      items: [
+        { id: 'i3', name: 'Corn tortillas', qty: '12', needed: true },
+        { id: 'i4', name: 'Limes', qty: '3', needed: false },
+      ],
+    },
+  ],
+}
+
+describe('SupplyArchivePage frozen post', () => {
+  it('opens a tapped post’s frozen list read-only, tagged Archived, sending no PATCH', async () => {
+    const fetchMock = stubServer({
+      [`GET ${ARCHIVE('week')}`]: archive('week'),
+      'GET /api/v1/shopping/2026-09-28': () => jsonResponse(200, FROZEN),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByText('Pizza, pot roast & the great orzo trial'))
+
+    expect(await screen.findByText('Archived')).toBeInTheDocument()
+    expect(screen.getByRole('heading', { level: 1, name: /Shopping list/ })).toBeInTheDocument()
+    expect(screen.getByText('Pizza dough')).toBeInTheDocument()
+    expect(screen.queryAllByRole('checkbox')).toEqual([])
+    fireEvent.click(screen.getByText('Pizza dough'))
+    fireEvent.click(screen.getByText('Mozzarella'))
+    expect(fetchMock.mock.calls.filter(([, init]) => init?.method !== undefined && init.method !== 'GET')).toEqual([])
+
+    // The list links back to the archive.
+    fireEvent.click(screen.getByRole('link', { name: 'Supply archive' }))
+    expect(await screen.findByRole('heading', { level: 1, name: 'Supply archive' })).toBeInTheDocument()
+  })
+
+  it('opens the current week’s post read-only too, tagged Archived, with no checkbox, nothing to send and no PATCH', async () => {
+    const fetchMock = stubServer({
+      [`GET ${ARCHIVE('week')}`]: archive('week'),
+      'GET /api/v1/shopping/2026-10-05': () => jsonResponse(200, CURRENT),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByText('Tacos, tikka & a salmon finale'))
+
+    expect(await screen.findByText('Archived')).toBeInTheDocument()
+    expect(screen.getByText("This week's list as it stands, read-only in the Supply archive.")).toBeInTheDocument()
+    expect(screen.getByText('Corn tortillas')).toBeInTheDocument()
+    expect(screen.queryAllByRole('checkbox')).toEqual([])
+    fireEvent.click(screen.getByText('Corn tortillas'))
+    fireEvent.click(screen.getByText('Limes'))
+    expect(fetchMock.mock.calls.filter(([, init]) => init?.method !== undefined && init.method !== 'GET')).toEqual([])
+  })
+
+  it('on desktop opens the current week’s post read-only, and with no post open shows this week’s Supply run to change', async () => {
+    mockViewport(1440)
+    const fetchMock = stubServer({
+      [`GET ${ARCHIVE('week')}`]: archive('week'),
+      'GET /api/v1/shopping/2026-10-05': () => jsonResponse(200, CURRENT),
+    })
+    const view = await renderPage('/plan/shopping/archive?week=2026-10-05')
+
+    expect(await screen.findByText('Archived')).toBeInTheDocument()
+    expect(screen.getByText('Corn tortillas')).toBeInTheDocument()
+    expect(screen.queryAllByRole('checkbox')).toEqual([])
+    expect(screen.queryByText('Send to Google Chat')).not.toBeInTheDocument()
+    fireEvent.click(screen.getByText('Corn tortillas'))
+    expect(fetchMock.mock.calls.filter(([, init]) => init?.method !== undefined && init.method !== 'GET')).toEqual([])
+    view.unmount()
+
+    await renderPage()
+    expect(await screen.findByRole('checkbox', { name: 'Corn tortillas' })).toBeInTheDocument()
+    expect(screen.queryByText('Archived')).not.toBeInTheDocument()
+  })
+
+  it('on desktop (mock 2f) shows the archive as a panel beside the open post’s list', async () => {
+    mockViewport(1440)
+    stubServer({
+      [`GET ${ARCHIVE('week')}`]: archive('week'),
+      'GET /api/v1/shopping/2026-09-28': () => jsonResponse(200, FROZEN),
+    })
+    await renderPage('/plan/shopping/archive?week=2026-09-28')
+
+    const panel = screen.getByRole('complementary', { name: 'Supply archive' })
+    expect(await within(panel).findByText('Chili season opens')).toBeInTheDocument()
+    expect(within(panel).queryByRole('button', { name: 'Back to the Supply run' })).not.toBeInTheDocument()
+    expect(await screen.findByText('Archived')).toBeInTheDocument()
+    expect(panel).not.toContainElement(screen.getByText('Pizza dough'))
+    expect(screen.queryAllByRole('checkbox')).toEqual([])
+  })
+})

web/src/shopping/SupplyArchivePage.tsx

@@ -0,0 +1,183 @@
+import { ChevronLeft } from 'lucide-react'
+import { useState } from 'react'
+import { Link, useNavigate, useSearchParams } from 'react-router'
+import { useBreakpoint } from '../shell/useBreakpoint.ts'
+import { Button } from '../ui/Button.tsx'
+import { EmptyState } from '../ui/EmptyState.tsx'
+import { ErrorBanner } from '../ui/ErrorBanner.tsx'
+import { Icon } from '../ui/Icon.tsx'
+import { IconButton } from '../ui/IconButton.tsx'
+import { Segmented } from '../ui/Segmented.tsx'
+import { Skeleton } from '../ui/Skeleton.tsx'
+import { useSupplyArchive, WEEK_PARAM, type ArchiveGroup, type ArchivePeriod, type ArchivePost } from './api.ts'
+import styles from './SupplyArchivePage.module.css'
+import { SUPPLY_ARCHIVE, SupplyRunPage } from './SupplyRunPage.tsx'
+
+// PAGE is how many posts the Supply archive shows at first, and how many
+// more each "Load older" shows.
+export const PAGE = 8
+
+// CHIPS is how many of a post's dinners it names; a "+N" chip counts the rest.
+const CHIPS = 2
+
+const PERIODS = [
+  { value: 'week', label: 'Week' },
+  { value: 'month', label: 'Month' },
+  { value: 'year', label: 'Year' },
+] as const satisfies readonly { value: ArchivePeriod; label: string }[]
+
+// archivePost is the Supply archive screen opened on the post of the week
+// starting on Monday weekStart.
+export function archivePost(weekStart: string): string {
+  return `${SUPPLY_ARCHIVE}?${new URLSearchParams({ [WEEK_PARAM]: weekStart })}`
+}
+
+function plural(n: number, one: string, many: string): string {
+  return `${n} ${n === 1 ? one : many}`
+}
+
+// PostCard is one week's Supply run (mock 1m): the week label as its kicker,
+// the AI's title — the week label while it has none — the counts and its
+// first dinners as chips. The current week's post is ringed in grape. It
+// opens the week's list, read-only.
+function PostCard({ post }: { post: ArchivePost }) {
+  const rest = post.dinners.length - CHIPS
+  return (
+    <Link to={archivePost(post.weekStart)} className={[styles.post, post.current && styles.current].filter(Boolean).join(' ')}>
+      <span className={styles.kicker}>
+        {post.label}
+        {post.current && ' · Current'}
+      </span>
+      <span className={styles.postTitle}>{post.title ?? post.label}</span>
+      <span className={styles.meta}>
+        {plural(post.dinnerCount, 'dinner', 'dinners')} · {plural(post.itemCount, 'item', 'items')} · {post.onHandCount} already on
+        hand
+      </span>
+      {post.dinners.length > 0 && (
+        <span className={styles.chips}>
+          {post.dinners.slice(0, CHIPS).map((name, i) => (
+            <span key={i} className={styles.chip}>
+              {name}
+            </span>
+          ))}
+          {rest > 0 && <span className={styles.chip}>+{rest}</span>}
+        </span>
+      )}
+    </Link>
+  )
+}
+
+function Posts({ posts }: { posts: ArchivePost[] }) {
+  return (
+    <ul className={styles.posts}>
+      {posts.map((post) => (
+        <li key={post.weekStart}>
+          <PostCard post={post} />
+        </li>
+      ))}
+    </ul>
+  )
+}
+
+// shownGroups is groups cut to their first shown posts, newest first, without
+// the periods left with none.
+function shownGroups(groups: ArchiveGroup[], shown: number): ArchiveGroup[] {
+  const out: ArchiveGroup[] = []
+  let left = shown
+  for (const group of groups) {
+    if (left === 0) break
+    const posts = group.posts.slice(0, left)
+    out.push({ ...group, posts })
+    left -= posts.length
+  }
+  return out
+}
+
+// ArchivePosts is the Supply archive as the server groups it by by: one post
+// per week, under the Bagel heading of each period the server sends — by
+// week, the week's label. It shows PAGE posts and "Load older" shows PAGE
+// more.
+function ArchivePosts({ by }: { by: ArchivePeriod }) {
+  const archive = useSupplyArchive(by)
+  const [shown, setShown] = useState(PAGE)
+
+  if (archive.isError) {
+    return <ErrorBanner onRetry={() => void archive.refetch()}>Couldn't load the Supply archive. {archive.error.message}</ErrorBanner>
+  }
+  if (archive.isPending) {
+    return (
+      <div aria-busy="true" aria-label="Supply archive loading" className={styles.posts}>
+        {Array.from({ length: 3 }, (_, i) => (
+          <Skeleton key={i} data-testid="skeleton-post" className={styles.skeletonPost} />
+        ))}
+      </div>
+    )
+  }
+  const total = archive.data.reduce((n, group) => n + group.posts.length, 0)
+  if (total === 0) {
+    return <EmptyState title="Nothing archived yet">Each week's Supply run becomes a post here once it's made.</EmptyState>
+  }
+  const groups = shownGroups(archive.data, shown)
+  return (
+    <>
+      {groups.map((group) => (
+        <section key={group.key} aria-label={group.heading} className={styles.period}>
+          <h2 className={styles.heading}>{group.heading}</h2>
+          <Posts posts={group.posts} />
+        </section>
+      ))}
+      {shown < total && (
+        <Button variant="outline" className={styles.older} onClick={() => setShown(shown + PAGE)}>
+          Load older
+        </Button>
+      )}
+    </>
+  )
+}
+
+// SupplyArchive is the Supply archive (mock 1m, and the right panel of 2f):
+// the Week | Month | Year control over the posts. On mobile and tablet a
+// back button returns to the Supply run.
+function SupplyArchive({ panel }: { panel: boolean }) {
+  const navigate = useNavigate()
+  const [by, setBy] = useState<ArchivePeriod>('week')
+  return (
+    <div className={styles.archive}>
+      <header className={styles.header}>
+        {!panel && (
+          <IconButton label="Back to the Supply run" onClick={() => void navigate('/plan/shopping')}>
+            <Icon icon={ChevronLeft} size="nav" />
+          </IconButton>
+        )}
+        <h1 className={styles.title}>Supply archive</h1>
+      </header>
+      <Segmented label="Group the Supply archive by" options={PERIODS} value={by} onValueChange={setBy} className={styles.periods} />
+      <ArchivePosts key={by} by={by} />
+    </div>
+  )
+}
+
+// SupplyArchivePage is /plan/shopping/archive. A post opens it on its week
+// (?week=), whose list the Supply run screen shows read-only and tagged
+// Archived, whatever its status: even the current week's post is only
+// viewed here, never changed. On desktop (mock 2f) the archive is a panel at
+// the right of that list, this week's editable Supply run when no post is
+// open; on mobile and tablet it is the archive or, with a post open, the
+// post's list.
+export function SupplyArchivePage() {
+  const layout = useBreakpoint()
+  const [params] = useSearchParams()
+  if (layout === 'desktop') {
+    return (
+      <div className={styles.split}>
+        <div className={styles.list}>
+          <SupplyRunPage readOnly={params.has(WEEK_PARAM)} />
+        </div>
+        <aside className={styles.panel} aria-label="Supply archive">
+          <SupplyArchive panel />
+        </aside>
+      </div>
+    )
+  }
+  return params.has(WEEK_PARAM) ? <SupplyRunPage readOnly /> : <SupplyArchive panel={false} />
+}

web/src/shopping/SupplyRunPage.module.css

@@ -0,0 +1,274 @@
+/* Supply run · shopping list (mocks 1l, 2b, 2f). */
+.page {
+  box-sizing: border-box;
+  display: flex;
+  flex-direction: column;
+  gap: 18px;
+}
+
+.mobile {
+  max-width: 440px;
+  padding-top: 8px;
+}
+
+.header {
+  display: flex;
+  align-items: flex-end;
+  justify-content: space-between;
+  gap: 16px;
+}
+
+.heading {
+  flex: 1;
+  min-width: 0;
+}
+
+.kicker {
+  margin: 0;
+  font-family: var(--font-body);
+  font-size: 11px;
+  font-weight: 700;
+  letter-spacing: 0.1em;
+  text-transform: uppercase;
+  color: var(--color-accent-700);
+}
+
+.titleRow {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 10px;
+}
+
+.title {
+  margin: 0;
+  font-family: var(--font-heading);
+  font-size: 30px;
+  font-weight: 400;
+  line-height: 1.1;
+}
+
+/* Still to buy / all items: at the right of the title on mobile, beside it
+   from tablet up, where the actions take the right. */
+.count {
+  margin: 0 0 0 auto;
+  font-family: var(--font-body);
+  font-size: 16px;
+  font-weight: 700;
+  color: var(--color-neutral-700);
+  white-space: nowrap;
+}
+
+.tablet .count,
+.desktop .count {
+  margin-left: 0;
+}
+
+.helper {
+  margin: 6px 0 0;
+  font-family: var(--font-body);
+  font-size: 14px;
+  line-height: 1.45;
+  color: var(--color-text);
+}
+
+.actions {
+  flex: none;
+  display: flex;
+  gap: 12px;
+}
+
+.action {
+  min-height: 44px;
+  text-decoration: none;
+}
+
+/* One card per dinner: stacked on mobile, three masonry columns from
+   tablet up. */
+.groups {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.tablet .groups,
+.desktop .groups {
+  display: block;
+  column-count: 3;
+  column-gap: 16px;
+}
+
+.group {
+  box-sizing: border-box;
+  padding: 16px 18px 10px;
+  border-radius: 24px;
+  background: var(--color-surface);
+  color: var(--color-text);
+  break-inside: avoid;
+}
+
+.tablet .group,
+.desktop .group {
+  margin-bottom: 16px;
+}
+
+.groupHeader {
+  display: flex;
+  align-items: baseline;
+  justify-content: space-between;
+  gap: 10px;
+}
+
+.dinner {
+  margin: 0;
+  font-family: var(--font-heading);
+  font-size: 16px;
+  font-weight: 400;
+  line-height: 1.2;
+}
+
+.day {
+  flex: none;
+  font-family: var(--font-body);
+  font-size: 11px;
+  font-weight: 700;
+  letter-spacing: 0.04em;
+  color: var(--color-neutral-700);
+}
+
+.items {
+  margin: 4px 0 0;
+  padding: 0;
+  list-style: none;
+}
+
+.item {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+}
+
+/* The checkbox's label fills the row, so the whole row up to the quantity
+   is the hit area. */
+.check {
+  flex: 1;
+  min-width: 0;
+}
+
+.readOnly {
+  flex: 1;
+  min-width: 0;
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-3);
+  min-height: 44px;
+}
+
+/* An archived item's mark: the checkbox's look, not interactive. */
+.box {
+  box-sizing: border-box;
+  display: grid;
+  place-content: center;
+  flex: none;
+  width: 22px;
+  height: 22px;
+  border: 2px solid var(--color-neutral-400);
+  border-radius: var(--radius-sm);
+}
+
+.item:not(.have) .box {
+  border-color: var(--color-accent);
+  background: var(--color-accent);
+  color: var(--on-accent);
+}
+
+.mark {
+  width: 14px;
+  height: 14px;
+}
+
+.name {
+  font-family: var(--font-body);
+  font-size: 15px;
+  font-weight: 500;
+  color: var(--color-text);
+}
+
+.have .name {
+  text-decoration: line-through;
+  color: var(--color-neutral-700);
+}
+
+/* Toggled while the server cannot be reached: the change is saved here and
+   sent once it can be. */
+.willSync {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  margin-left: 8px;
+  font-family: var(--font-body);
+  font-size: 12px;
+  font-weight: 700;
+  color: var(--color-neutral-700);
+  text-decoration: none;
+  vertical-align: middle;
+}
+
+.qty {
+  flex: none;
+  font-family: var(--font-body);
+  font-size: 13px;
+  color: var(--color-neutral-700);
+  text-align: right;
+}
+
+.have .qty {
+  font-weight: 700;
+}
+
+.sent {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin: 0;
+  font-family: var(--font-body);
+  font-size: 14px;
+  font-weight: 700;
+  color: var(--color-accent-2-800);
+}
+
+.footer {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 14px;
+}
+
+.archiveLink {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  min-height: 44px;
+  font-family: var(--font-body);
+  font-size: 14px;
+  font-weight: 700;
+  color: var(--color-accent-700);
+  text-decoration: none;
+}
+
+.skeletonTitle {
+  width: 220px;
+  height: 34px;
+}
+
+.skeletonGroup {
+  height: 160px;
+  border-radius: 24px;
+}
+
+.tablet .skeletonGroup,
+.desktop .skeletonGroup {
+  margin-bottom: 16px;
+  break-inside: avoid;
+}

web/src/shopping/SupplyRunPage.test.tsx

@@ -0,0 +1,491 @@
+import { QueryClientProvider } from '@tanstack/react-query'
+import { fireEvent, render, screen, waitFor, within } from '@testing-library/react'
+import { MemoryRouter } from 'react-router'
+import { afterEach, beforeEach, describe, expect, it, vi, type Mock } from 'vitest'
+import { ApiProvider, createApiClient, createQueryClient, createVerifiedSession } from '../api/index.ts'
+import { createNetworkStatus } from '../pwa/networkStatus.ts'
+import { HOUSEHOLD_SETTINGS } from '../test/ApiProviders.tsx'
+import { declaredStyle } from '../test/cssRules.ts'
+import { errorResponse, fakeLocation, jsonResponse, ME } from '../test/fetchStub.ts'
+import { mockViewport } from '../test/matchMedia.ts'
+import buttonStyles from '../ui/Button.module.css'
+import { sentAt, SupplyRunPage } from './SupplyRunPage.tsx'
+
+const THIS_WEEK = '/api/v1/shopping/2026-10-05'
+const GENERATE = `${THIS_WEEK}/generate`
+const ITEM = (id: string) => `/api/v1/shopping/items/${id}`
+
+type Item = { id: string; name: string; qty: string | null; needed: boolean }
+
+// The week of Oct 5's Supply run, as mock 1l starts it: Monday's tacos and
+// Wednesday's tikka masala, each with one item the household has.
+const GROUPS: { dinner: { id: string; name: string }; date: string; day: string; items: Item[] }[] = [
+  {
+    dinner: { id: 'd0', name: 'Beef tacos' },
+    date: '2026-10-05',
+    day: 'Monday',
+    items: [
+      { id: 'i1', name: 'Ground beef', qty: '1 lb', needed: true },
+      { id: 'i2', name: 'Corn tortillas', qty: '12', needed: true },
+      { id: 'i3', name: 'Taco seasoning', qty: '1 packet', needed: false },
+    ],
+  },
+  {
+    dinner: { id: 'd2', name: 'Crock pot tikka masala' },
+    date: '2026-10-07',
+    day: 'Wednesday',
+    items: [
+      { id: 'i4', name: 'Chicken thighs', qty: '2 lb', needed: true },
+      { id: 'i5', name: 'Tikka masala paste', qty: '1 jar', needed: true },
+      { id: 'i6', name: 'Basmati rice', qty: null, needed: false },
+    ],
+  },
+]
+
+// supplyRun is the week's Supply run as GET /api/v1/shopping/{weekStart}
+// sends it, counted from its items.
+function supplyRun(overrides: Record<string, unknown> = {}, weekStart = '2026-10-05', label = 'Week 41 · Oct 5 – 11') {
+  const items = GROUPS.flatMap((group) => group.items)
+  return {
+    weekStart,
+    label,
+    title: null,
+    status: 'current',
+    sent_to_chat_at: null,
+    needed_count: items.filter((item) => item.needed).length,
+    total_count: items.length,
+    groups: GROUPS,
+    ...overrides,
+  }
+}
+
+// deferred is a response the test sends when it chooses.
+function deferred() {
+  let send!: (response: Response) => void
+  const response = new Promise<Response>((resolve) => {
+    send = resolve
+  })
+  return { response, send }
+}
+
+type Responder = (init: RequestInit | undefined) => Response | Promise<Response>
+
+// stubServer answers "METHOD path" requests from responders, with /me and
+// the household settings; any other request fails the test.
+function stubServer(responders: Record<string, Responder>) {
+  const all: Record<string, Responder> = {
+    'GET /api/v1/me': () => jsonResponse(200, ME),
+    'GET /api/v1/settings/household': () => jsonResponse(200, HOUSEHOLD_SETTINGS),
+    ...responders,
+  }
+  const fetchMock = vi.fn<typeof fetch>((input, init) => {
+    const key = `${init?.method ?? 'GET'} ${String(input)}`
+    const respond = Object.hasOwn(all, key) ? all[key] : undefined
+    if (respond === undefined) throw new Error(`unexpected fetch: ${key}`)
+    return Promise.resolve(respond(init))
+  })
+  vi.stubGlobal('fetch', fetchMock)
+  return fetchMock
+}
+
+// writes lists the PATCHes and POSTs sent, as "METHOD path body".
+function writes(fetchMock: Mock<typeof fetch>) {
+  return fetchMock.mock.calls
+    .filter(([, init]) => init?.method === 'PATCH' || init?.method === 'POST')
+    .map(([input, init]) => `${init!.method} ${String(input)} ${String(init?.body)}`)
+}
+
+// renderPage loads /me (for the CSRF token every write needs) and renders
+// the Supply run at path.
+async function renderPage(path = '/plan/shopping') {
+  const api = createApiClient(fakeLocation('/plan/shopping'), createNetworkStatus(window), createVerifiedSession(localStorage))
+  await api.loadMe()
+  return render(
+    <ApiProvider client={api}>
+      <QueryClientProvider client={createQueryClient()}>
+        <MemoryRouter initialEntries={[path]}>
+          <SupplyRunPage />
+        </MemoryRouter>
+      </QueryClientProvider>
+    </ApiProvider>,
+  )
+}
+
+// Wednesday Oct 7, noon in New York: before Friday's 09:00 plan_draft, so
+// the page opens on this week.
+beforeEach(() => {
+  mockViewport(390)
+  vi.useFakeTimers({ toFake: ['Date'] })
+  vi.setSystemTime(new Date('2026-10-07T16:00:00Z'))
+})
+
+afterEach(() => {
+  vi.useRealTimers()
+  vi.unstubAllGlobals()
+  Reflect.deleteProperty(window, 'matchMedia')
+})
+
+function checkbox(name: string) {
+  return screen.getByRole('checkbox', { name })
+}
+
+function row(name: string) {
+  return screen.getByText(name).closest('li')!
+}
+
+describe('SupplyRunPage', () => {
+  it('renders mock 1l: kicker, title, the count to buy of all items and the helper', async () => {
+    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()) })
+    await renderPage()
+
+    const title = await screen.findByRole('heading', { level: 1, name: 'Shopping list' })
+    expect(declaredStyle(title).fontFamily).toBe('var(--font-heading)')
+    // The kicker is the week's dates, set in capitals by the stylesheet.
+    const kicker = screen.getByText('Supply run · Oct 5 – 11')
+    expect(declaredStyle(kicker).textTransform).toBe('uppercase')
+    expect(declaredStyle(kicker).color).toBe('var(--color-accent-700)')
+    expect(screen.getByText('4 / 6')).toBeInTheDocument()
+    expect(screen.getByText("Uncheck anything you already have — it won't be counted.")).toBeInTheDocument()
+    expect(screen.queryByText('Archived')).not.toBeInTheDocument()
+  })
+
+  it('shows one surface card per dinner with its Bagel name and day', async () => {
+    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()) })
+    await renderPage()
+
+    const tacos = await screen.findByRole('region', { name: 'Beef tacos' })
+    expect(screen.getAllByRole('region')).toHaveLength(2)
+    expect(declaredStyle(tacos).borderRadius).toBe('24px')
+    expect(declaredStyle(tacos).background).toBe('var(--color-surface)')
+    const name = within(tacos).getByRole('heading', { level: 2, name: 'Beef tacos' })
+    expect(declaredStyle(name).fontFamily).toBe('var(--font-heading)')
+    expect(declaredStyle(name).fontSize).toBe('16px')
+    expect(declaredStyle(within(tacos).getByText('MON')).fontSize).toBe('11px')
+    expect(within(screen.getByRole('region', { name: 'Crock pot tikka masala' })).getByText('WED')).toBeInTheDocument()
+  })
+
+  it('checks the items to buy; one the household has is unchecked, struck through and "have it"', async () => {
+    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()) })
+    await renderPage()
+
+    expect(await screen.findByRole('checkbox', { name: 'Ground beef' })).toBeChecked()
+    expect(within(row('Ground beef')).getByText('1 lb')).toBeInTheDocument()
+    expect(declaredStyle(screen.getByText('Ground beef')).textDecoration).toBe('')
+
+    expect(checkbox('Taco seasoning')).not.toBeChecked()
+    expect(within(row('Taco seasoning')).getByText('have it')).toBeInTheDocument()
+    expect(within(row('Taco seasoning')).queryByText('1 packet')).not.toBeInTheDocument()
+    expect(declaredStyle(screen.getByText('Taco seasoning')).textDecoration).toBe('line-through')
+    expect(screen.getAllByText('have it')).toHaveLength(2)
+  })
+
+  it('toggles an item at once, then shows the counts the server answers with', async () => {
+    const answer = deferred()
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()),
+      [`PATCH ${ITEM('i3')}`]: () => answer.response,
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Taco seasoning' }))
+    // At once, before the server answers: checked, no longer "have it", and counted.
+    expect(checkbox('Taco seasoning')).toBeChecked()
+    expect(within(row('Taco seasoning')).getByText('1 packet')).toBeInTheDocument()
+    expect(screen.getByText('5 / 6')).toBeInTheDocument()
+    await waitFor(() => expect(writes(fetchMock)).toEqual([`PATCH ${ITEM('i3')} {"needed":true}`]))
+    const call = fetchMock.mock.calls.find(([, init]) => init?.method === 'PATCH')!
+    expect(new Headers(call[1]?.headers).get('X-MealQuest-CSRF')).toBe(ME.csrfToken)
+
+    // The server's counts are the ones shown.
+    answer.send(jsonResponse(200, { id: 'i3', needed: true, needed_count: 5, total_count: 7 }))
+    expect(await screen.findByText('5 / 7')).toBeInTheDocument()
+    expect(checkbox('Taco seasoning')).toBeChecked()
+  })
+
+  it('marks an item "have it" by unchecking it', async () => {
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()),
+      [`PATCH ${ITEM('i1')}`]: () => jsonResponse(200, { id: 'i1', needed: false, needed_count: 3, total_count: 6 }),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Ground beef' }))
+    expect(checkbox('Ground beef')).not.toBeChecked()
+    expect(within(row('Ground beef')).getByText('have it')).toBeInTheDocument()
+    expect(screen.getByText('3 / 6')).toBeInTheDocument()
+    await waitFor(() => expect(writes(fetchMock)).toEqual([`PATCH ${ITEM('i1')} {"needed":false}`]))
+  })
+
+  it('puts a refused toggle back, item and count, and says why with Retry', async () => {
+    const answer = deferred()
+    let patches = 0
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()),
+      [`PATCH ${ITEM('i3')}`]: () => {
+        patches++
+        return patches === 1 ? answer.response : jsonResponse(200, { id: 'i3', needed: true, needed_count: 5, total_count: 6 })
+      },
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Taco seasoning' }))
+    expect(checkbox('Taco seasoning')).toBeChecked()
+    expect(screen.getByText('5 / 6')).toBeInTheDocument()
+
+    answer.send(errorResponse(500, 'internal'))
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent('Couldn\'t mark Taco seasoning to buy. internal message')
+    expect(checkbox('Taco seasoning')).not.toBeChecked()
+    expect(within(row('Taco seasoning')).getByText('have it')).toBeInTheDocument()
+    expect(screen.getByText('4 / 6')).toBeInTheDocument()
+
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    expect(checkbox('Taco seasoning')).toBeChecked()
+    await waitFor(() => expect(screen.queryByRole('alert')).not.toBeInTheDocument())
+    expect(screen.getByText('5 / 6')).toBeInTheDocument()
+    expect(writes(fetchMock)).toEqual([`PATCH ${ITEM('i3')} {"needed":true}`, `PATCH ${ITEM('i3')} {"needed":true}`])
+  })
+
+  it('sends toggles one at a time and keeps the count true when one between them fails', async () => {
+    const first = deferred()
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()),
+      [`PATCH ${ITEM('i3')}`]: () => first.response,
+      [`PATCH ${ITEM('i6')}`]: () => jsonResponse(200, { id: 'i6', needed: true, needed_count: 5, total_count: 6 }),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Taco seasoning' }))
+    fireEvent.click(checkbox('Basmati rice'))
+    expect(screen.getByText('6 / 6')).toBeInTheDocument()
+    // The second waits for the first.
+    await waitFor(() => expect(writes(fetchMock)).toEqual([`PATCH ${ITEM('i3')} {"needed":true}`]))
+
+    first.send(errorResponse(500, 'internal'))
+    await waitFor(() => expect(writes(fetchMock)).toHaveLength(2))
+    await waitFor(() => expect(screen.getByText('5 / 6')).toBeInTheDocument())
+    expect(checkbox('Taco seasoning')).not.toBeChecked()
+    expect(checkbox('Basmati rice')).toBeChecked()
+  })
+
+  it('keeps a refused toggle shown when a later toggle of another item succeeds, until it is retried', async () => {
+    let patches = 0
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()),
+      [`PATCH ${ITEM('i3')}`]: () => {
+        patches++
+        return patches === 1 ? errorResponse(500, 'internal') : jsonResponse(200, { id: 'i3', needed: true, needed_count: 6, total_count: 6 })
+      },
+      [`PATCH ${ITEM('i6')}`]: () => jsonResponse(200, { id: 'i6', needed: true, needed_count: 5, total_count: 6 }),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Taco seasoning' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent("Couldn't mark Taco seasoning to buy. internal message")
+    expect(checkbox('Taco seasoning')).not.toBeChecked()
+
+    fireEvent.click(checkbox('Basmati rice'))
+    await waitFor(() => expect(screen.getByText('5 / 6')).toBeInTheDocument())
+    expect(checkbox('Basmati rice')).toBeChecked()
+    // The refusal is still shown: nothing has superseded it.
+    const alert = screen.getByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't mark Taco seasoning to buy. internal message")
+    expect(checkbox('Taco seasoning')).not.toBeChecked()
+
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    await waitFor(() => expect(screen.getByText('6 / 6')).toBeInTheDocument())
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+    expect(checkbox('Taco seasoning')).toBeChecked()
+  })
+
+  it('reads the list again when a toggle is refused because the week was archived, and shows it read-only', async () => {
+    let reads = 0
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => {
+        reads++
+        return jsonResponse(200, supplyRun(reads === 1 ? {} : { status: 'archived' }))
+      },
+      [`PATCH ${ITEM('i3')}`]: () => errorResponse(409, 'archived'),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Taco seasoning' }))
+    expect(await screen.findByText('Archived')).toBeInTheDocument()
+    expect(reads).toBe(2)
+    expect(screen.queryAllByRole('checkbox')).toEqual([])
+    expect(within(row('Taco seasoning')).getByText('have it')).toBeInTheDocument()
+    expect(screen.getByText('4 / 6')).toBeInTheDocument()
+    expect(screen.getByText('This list is in the Supply archive, as it was when the week ended.')).toBeInTheDocument()
+    // It says why, with nothing to retry.
+    const alert = screen.getByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't mark Taco seasoning to buy. archived message")
+    expect(within(alert).queryByRole('button')).not.toBeInTheDocument()
+
+    fireEvent.click(screen.getByText('Taco seasoning'))
+    expect(writes(fetchMock)).toEqual([`PATCH ${ITEM('i3')} {"needed":true}`])
+  })
+
+  it('shows the status line once the list was sent to Google Chat', async () => {
+    // Saturday Oct 10, 8:00 am in New York.
+    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun({ sent_to_chat_at: '2026-10-10T12:00:00Z' })) })
+    await renderPage()
+
+    const status = await screen.findByText('Sent to Google Chat · Sat 8:00 am')
+    expect(declaredStyle(status).color).toBe('var(--color-accent-2-800)')
+  })
+
+  it('has no status line until the list is sent', async () => {
+    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()) })
+    await renderPage()
+
+    await screen.findByText('4 / 6')
+    expect(screen.queryByText(/Sent to Google Chat/)).not.toBeInTheDocument()
+  })
+
+  it('stacks the cards on mobile, with a link to the Supply archive and no header actions', async () => {
+    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun()) })
+    await renderPage()
+
+    await screen.findByText('4 / 6')
+    const groups = screen.getByTestId('supply-run-groups')
+    expect(declaredStyle(groups).flexDirection).toBe('column')
+    expect(declaredStyle(groups).columnCount).toBe('')
+    expect(screen.getByRole('link', { name: 'Supply archive' })).toHaveAttribute('href', '/plan/shopping/archive')
+    expect(screen.queryByRole('button', { name: 'Send to Google Chat' })).not.toBeInTheDocument()
+    expect(screen.queryByRole('link', { name: 'Archive' })).not.toBeInTheDocument()
+  })
+
+  it.each([
+    ['tablet (mock 2b)', 1180],
+    ['desktop (mock 2f)', 1440],
+  ])('lays the cards out in 3 masonry columns on %s, with Archive and Send to Google Chat', async (_layout, width) => {
+    mockViewport(width)
+    const fetchMock = stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, supplyRun({ sent_to_chat_at: '2026-10-10T12:00:00Z' })) })
+    await renderPage()
+
+    await screen.findByText('4 / 6')
+    const groups = screen.getByTestId('supply-run-groups')
+    expect(declaredStyle(groups).columnCount).toBe('3')
+    expect(declaredStyle(screen.getByRole('region', { name: 'Beef tacos' })).breakInside).toBe('avoid')
+
+    const archive = screen.getByRole('link', { name: 'Archive' })
+    expect(archive).toHaveAttribute('href', '/plan/shopping/archive')
+    expect(archive).toHaveClass(buttonStyles.outline!)
+
+    // Send to Google Chat waits for Feature 19: primary, unavailable, and
+    // its tooltip says so. Pressing it sends nothing.
+    const send = screen.getByRole('button', { name: 'Send to Google Chat' })
+    expect(send).toHaveClass(buttonStyles.primary!)
+    expect(send).toHaveAttribute('aria-disabled', 'true')
+    expect(send).toHaveAccessibleDescription('Sending the shopping list to Google Chat arrives in a later update.')
+    fireEvent.click(send)
+    expect(writes(fetchMock)).toEqual([])
+
+    expect(screen.getByText('Sent to Google Chat · Sat 8:00 am')).toBeInTheDocument()
+    expect(screen.queryByRole('link', { name: 'Supply archive' })).not.toBeInTheDocument()
+  })
+
+  it('renders an archived list read-only, tagged Archived', async () => {
+    const fetchMock = stubServer({
+      'GET /api/v1/shopping/2026-09-28': () =>
+        jsonResponse(200, supplyRun({ status: 'archived' }, '2026-09-28', 'Week 40 · Sep 28 – Oct 4')),
+    })
+    await renderPage('/plan/shopping?week=2026-09-28')
+
+    expect(await screen.findByText('Supply run · Sep 28 – Oct 4')).toBeInTheDocument()
+    expect(screen.getByText('Archived')).toBeInTheDocument()
+    expect(screen.getByText('This list is in the Supply archive, as it was when the week ended.')).toBeInTheDocument()
+    expect(screen.queryAllByRole('checkbox')).toEqual([])
+    // The marks still show what was bought and what was on hand.
+    expect(within(row('Ground beef')).getByText('1 lb')).toBeInTheDocument()
+    expect(within(row('Taco seasoning')).getByText('have it')).toBeInTheDocument()
+    expect(declaredStyle(screen.getByText('Taco seasoning')).textDecoration).toBe('line-through')
+    expect(screen.getByText('4 / 6')).toBeInTheDocument()
+
+    fireEvent.click(screen.getByText('Taco seasoning'))
+    expect(screen.getByText('4 / 6')).toBeInTheDocument()
+    expect(writes(fetchMock)).toEqual([])
+  })
+
+  it('offers no Send to Google Chat for an archived list on tablet', async () => {
+    mockViewport(1180)
+    stubServer({
+      'GET /api/v1/shopping/2026-09-28': () =>
+        jsonResponse(200, supplyRun({ status: 'archived' }, '2026-09-28', 'Week 40 · Sep 28 – Oct 4')),
+    })
+    await renderPage('/plan/shopping?week=2026-09-28')
+
+    await screen.findByText('Archived')
+    expect(screen.queryAllByRole('checkbox')).toEqual([])
+    expect(screen.queryByRole('button', { name: 'Send to Google Chat' })).not.toBeInTheDocument()
+    expect(screen.getByRole('link', { name: 'Archive' })).toBeInTheDocument()
+  })
+
+  it('refuses a week that is not a Monday', async () => {
+    const fetchMock = stubServer({})
+    await renderPage('/plan/shopping?week=2026-09-29')
+
+    expect(await screen.findByRole('alert')).toHaveTextContent('“2026-09-29” is not the Monday of a week, as YYYY-MM-DD.')
+    expect(fetchMock.mock.calls.filter(([input]) => String(input).startsWith('/api/v1/shopping'))).toEqual([])
+  })
+
+  it('shows skeleton cards while the list loads', async () => {
+    const answer = deferred()
+    stubServer({ [`GET ${THIS_WEEK}`]: () => answer.response })
+    await renderPage()
+
+    expect(await screen.findByRole('region', { name: 'Shopping list loading' })).toHaveAttribute('aria-busy', 'true')
+    await waitFor(() => expect(screen.getAllByTestId('skeleton-group')).toHaveLength(3))
+    answer.send(jsonResponse(200, supplyRun()))
+    expect(await screen.findByText('4 / 6')).toBeInTheDocument()
+    expect(screen.queryByTestId('skeleton-group')).not.toBeInTheDocument()
+  })
+
+  it('says when the list cannot load, and Retry reads it again', async () => {
+    let reads = 0
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => {
+        reads++
+        return reads === 1 ? errorResponse(500, 'internal') : jsonResponse(200, supplyRun())
+      },
+    })
+    await renderPage()
+
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't load the shopping list. internal message")
+    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
+    expect(await screen.findByText('4 / 6')).toBeInTheDocument()
+  })
+
+  it('offers to make the list when the week has none, and shows the list made', async () => {
+    const fetchMock = stubServer({
+      [`GET ${THIS_WEEK}`]: () => errorResponse(404, 'not_found'),
+      [`POST ${GENERATE}`]: () => jsonResponse(200, { ...supplyRun(), skipped: [] }),
+    })
+    await renderPage()
+
+    expect(await screen.findByRole('heading', { name: 'No shopping list yet' })).toBeInTheDocument()
+    fireEvent.click(screen.getByRole('button', { name: 'Make the shopping list' }))
+    expect(await screen.findByText('4 / 6')).toBeInTheDocument()
+    expect(writes(fetchMock)).toEqual([`POST ${GENERATE} undefined`])
+  })
+
+  it('says why the list could not be made', async () => {
+    stubServer({
+      [`GET ${THIS_WEEK}`]: () => errorResponse(404, 'not_found'),
+      [`POST ${GENERATE}`]: () => errorResponse(404, 'not_found'),
+    })
+    await renderPage()
+
+    fireEvent.click(await screen.findByRole('button', { name: 'Make the shopping list' }))
+    expect(await screen.findByRole('alert')).toHaveTextContent("Couldn't make the shopping list. not_found message")
+    expect(screen.getByRole('heading', { name: 'No shopping list yet' })).toBeInTheDocument()
+  })
+})
+
+describe('sentAt', () => {
+  it('says the day and time in the household zone', () => {
+    expect(sentAt(new Date('2026-10-10T12:00:00Z'), 'America/New_York')).toBe('Sat 8:00 am')
+    expect(sentAt(new Date('2026-10-11T03:30:00Z'), 'America/New_York')).toBe('Sat 11:30 pm')
+  })
+})

web/src/shopping/SupplyRunPage.tsx

@@ -0,0 +1,289 @@
+import { Archive, Check, CloudUpload, MessageSquare } from 'lucide-react'
+import { useState } from 'react'
+import { Link, useSearchParams } from 'react-router'
+import { Unavailable } from '../plan/PlanPage.tsx'
+import { defaultWeek, localNow, weekdayKicker, weekLabel, weekStart as weekOf } from '../plan/week.ts'
+import { formatClockTime, useHouseholdSettings } from '../settings/api.ts'
+import { useBreakpoint, type Breakpoint } from '../shell/useBreakpoint.ts'
+import buttonStyles from '../ui/Button.module.css'
+import { Checkbox } from '../ui/Checkbox.tsx'
+import { EmptyState } from '../ui/EmptyState.tsx'
+import { ErrorBanner } from '../ui/ErrorBanner.tsx'
+import { Icon } from '../ui/Icon.tsx'
+import { Skeleton } from '../ui/Skeleton.tsx'
+import { Tag } from '../ui/Tag.tsx'
+import {
+  useGenerateSupplyRun,
+  useSupplyRun,
+  useToggles,
+  WEEK_PARAM,
+  type SupplyRunGroup,
+  type SupplyRunItem,
+  type Toggles,
+} from './api.ts'
+import { keep, savedSchedule, useSavedProblem } from './offline.ts'
+import styles from './SupplyRunPage.module.css'
+
+// SUPPLY_ARCHIVE is the Supply archive screen.
+export const SUPPLY_ARCHIVE = '/plan/shopping/archive'
+
+// CHAT_HINT is why Send to Google Chat is unavailable.
+// TODO(Feature 19): send the Supply run to Google Chat once it is built.
+const CHAT_HINT = 'Sending the shopping list to Google Chat arrives in a later update.'
+
+// sentAt is when the Supply run was sent to Google Chat as its status line
+// says it, in the household's zone: "Sat 8:00 am".
+export function sentAt(at: Date, timezone: string): string {
+  const day = new Intl.DateTimeFormat('en-US', { weekday: 'short', timeZone: timezone }).format(at)
+  return `${day} ${formatClockTime(localNow(timezone, at).time)}`
+}
+
+// ItemRow is one ingredient: on a current Supply run a checkbox, checked
+// (grape) while it is to buy; unchecked, the name is struck through and
+// "have it" stands in for the quantity. A read-only Supply run shows the
+// same marks. An item toggled while the server cannot be reached
+// says it will sync.
+function ItemRow({ item, toggles }: { item: SupplyRunItem; toggles: Toggles | null }) {
+  const name = (
+    <>
+      <span className={styles.name}>{item.name}</span>
+      {toggles?.willSync.has(item.id) && (
+        <span className={styles.willSync}>
+          <Icon icon={CloudUpload} size="inline" />
+          will sync
+        </span>
+      )}
+    </>
+  )
+  return (
+    <li className={[styles.item, !item.needed && styles.have].filter(Boolean).join(' ')}>
+      {toggles === null ? (
+        <span className={styles.readOnly}>
+          <span className={styles.box} aria-hidden="true">
+            {item.needed && <Icon icon={Check} size="inline" className={styles.mark} />}
+          </span>
+          {name}
+        </span>
+      ) : (
+        <Checkbox
+          className={styles.check}
+          label={name}
+          checked={item.needed}
+          onChange={() => toggles.toggle({ id: item.id, needed: !item.needed })}
+        />
+      )}
+      <span className={styles.qty}>{item.needed ? item.qty : 'have it'}</span>
+    </li>
+  )
+}
+
+// GroupCard is one dinner's items: its name in Bagel over its day.
+function GroupCard({ group, toggles }: { group: SupplyRunGroup; toggles: Toggles | null }) {
+  return (
+    <section className={styles.group} aria-label={group.dinner.name}>
+      <header className={styles.groupHeader}>
+        <h2 className={styles.dinner}>{group.dinner.name}</h2>
+        <span className={styles.day}>{weekdayKicker(group.date)}</span>
+      </header>
+      <ul className={styles.items}>
+        {group.items.map((item) => (
+          <ItemRow key={item.id} item={item} toggles={toggles} />
+        ))}
+      </ul>
+    </section>
+  )
+}
+
+// SentStatus is the status line once the Supply run was sent to Google Chat.
+function SentStatus({ at, timezone }: { at: Date; timezone: string }) {
+  return (
+    <p className={styles.sent}>
+      <Icon icon={MessageSquare} size="inline" />
+      Sent to Google Chat · {sentAt(at, timezone)}
+    </p>
+  )
+}
+
+// ArchiveLink opens the Supply archive: an outline action from tablet up, a
+// grape link on mobile.
+function ArchiveLink({ layout }: { layout: Breakpoint }) {
+  const className = layout === 'mobile' ? styles.archiveLink : [buttonStyles.button, buttonStyles.outline, styles.action].join(' ')
+  return (
+    <Link to={SUPPLY_ARCHIVE} className={className}>
+      <Icon icon={Archive} size="inline" />
+      {layout === 'mobile' ? 'Supply archive' : 'Archive'}
+    </Link>
+  )
+}
+
+// SupplyRunList is a week's Supply run (mocks 1l, 2b, 2f): the kicker with
+// the week's dates, the title with the count still to buy of all items, and
+// one card per dinner, stacked on mobile and in three masonry columns from
+// tablet up, where Archive and Send to Google Chat are actions in the
+// header. On a current Supply run each item toggles at once (useToggles); a
+// toggle refused puts the item back and says why. An archived one, or any
+// opened from the Supply archive (readOnly), is read-only and tagged
+// Archived, and a toggle it refused is not offered again.
+function SupplyRunList({ weekStart, timezone, layout, readOnly }: WeekProps) {
+  const toggles = useToggles(weekStart)
+  const run = toggles.shown
+  const viewOnly = readOnly || run.status === 'archived'
+  const wide = layout !== 'mobile'
+  const failed = toggles.failed
+  const failedItem = failed && run.groups.flatMap((group) => group.items).find((item) => item.id === failed.toggle.id)
+
+  return (
+    <div className={`${styles.page} ${styles[layout]}`}>
+      <header className={styles.header}>
+        <div className={styles.heading}>
+          <p className={styles.kicker}>Supply run · {weekLabel(weekStart).dates}</p>
+          <div className={styles.titleRow}>
+            <h1 className={styles.title}>Shopping list</h1>
+            {viewOnly && <Tag tone="grape">Archived</Tag>}
+            <p className={styles.count}>
+              {run.needed_count} / {run.total_count}
+            </p>
+          </div>
+          <p className={styles.helper}>
+            {run.status === 'archived'
+              ? 'This list is in the Supply archive, as it was when the week ended.'
+              : viewOnly
+                ? "This week's list as it stands, read-only in the Supply archive."
+                : "Uncheck anything you already have — it won't be counted."}
+          </p>
+        </div>
+        {wide && (
+          <div className={styles.actions}>
+            <ArchiveLink layout={layout} />
+            {!viewOnly && (
+              <Unavailable hint={CHAT_HINT} below className={styles.action}>
+                <Icon icon={MessageSquare} size="inline" />
+                Send to Google Chat
+              </Unavailable>
+            )}
+          </div>
+        )}
+      </header>
+      {failed !== null && (
+        <ErrorBanner onRetry={viewOnly ? undefined : () => toggles.toggle(failed.toggle)}>
+          Couldn't mark {failedItem ? failedItem.name : 'an item'} {failed.toggle.needed ? 'to buy' : '“have it”'}.{' '}
+          {failed.error.message}
+        </ErrorBanner>
+      )}
+      {wide && run.sent_to_chat_at !== null && <SentStatus at={run.sent_to_chat_at} timezone={timezone} />}
+      {run.groups.length === 0 ? (
+        <EmptyState title="Nothing to buy">None of this week's dinners has a recipe with ingredients yet.</EmptyState>
+      ) : (
+        <div className={styles.groups} data-testid="supply-run-groups">
+          {run.groups.map((group) => (
+            <GroupCard key={`${group.date} ${group.dinner.id}`} group={group} toggles={viewOnly ? null : toggles} />
+          ))}
+        </div>
+      )}
+      {!wide && (
+        <footer className={styles.footer}>
+          {run.sent_to_chat_at !== null && <SentStatus at={run.sent_to_chat_at} timezone={timezone} />}
+          <ArchiveLink layout={layout} />
+        </footer>
+      )}
+    </div>
+  )
+}
+
+// SkeletonGroups stands in for the dinner cards while the Supply run loads.
+function SkeletonGroups({ layout }: { layout: Breakpoint }) {
+  return (
+    <section aria-busy="true" aria-label="Shopping list loading" className={`${styles.page} ${styles[layout]}`}>
+      <Skeleton className={styles.skeletonTitle} />
+      <div className={styles.groups}>
+        {Array.from({ length: 3 }, (_, i) => (
+          <Skeleton key={i} data-testid="skeleton-group" className={styles.skeletonGroup} />
+        ))}
+      </div>
+    </section>
+  )
+}
+
+type WeekProps = { weekStart: string; timezone: string; layout: Breakpoint; readOnly: boolean }
+
+// WeekSupplyRun is the Supply run of the week starting on weekStart, or,
+// when the week has none yet, the offer to make it from the week's plan —
+// not offered read-only.
+function WeekSupplyRun({ weekStart, timezone, layout, readOnly }: WeekProps) {
+  const run = useSupplyRun(weekStart)
+  const generate = useGenerateSupplyRun(weekStart)
+
+  // Offline, the Supply run saved on this device stays shown; the offline
+  // pill says it is saved data.
+  if (run.isError && !(run.data !== undefined && run.error instanceof TypeError)) {
+    return <ErrorBanner onRetry={() => void run.refetch()}>Couldn't load the shopping list. {run.error.message}</ErrorBanner>
+  }
+  if (run.isPending || generate.isPending) return <SkeletonGroups layout={layout} />
+  if (run.data === null) {
+    return (
+      <div className={`${styles.page} ${styles[layout]}`}>
+        {readOnly ? (
+          <EmptyState title="No shopping list">This week has no Supply run in the Supply archive.</EmptyState>
+        ) : (
+          <EmptyState title="No shopping list yet" action={{ label: 'Make the shopping list', onClick: () => generate.mutate() }}>
+            I'll gather the ingredients of this week's planned dinners into a Supply run.
+          </EmptyState>
+        )}
+        {generate.isError && (
+          <ErrorBanner onRetry={() => generate.mutate()}>Couldn't make the shopping list. {generate.error.message}</ErrorBanner>
+        )}
+      </div>
+    )
+  }
+  return <SupplyRunList weekStart={weekStart} timezone={timezone} layout={layout} readOnly={readOnly} />
+}
+
+// SupplyRunPage is the Supply run (mock 1l on mobile, 2b on tablet, 2f on
+// desktop) of the week the Plan opens on — next week once this week's
+// plan_draft time has come, otherwise this week — or of the week chosen by
+// ?week=. Opened from the Supply archive it is readOnly: tagged Archived,
+// with no checkbox and nothing to make or send, whatever the week. Offline,
+// where the settings cannot be read, it chooses the week by the schedule
+// saved on this device.
+export function SupplyRunPage({ readOnly = false }: { readOnly?: boolean }) {
+  const problem = useSavedProblem()
+  return (
+    <>
+      {problem !== null && (
+        <ErrorBanner>Changes to the shopping list can't be kept on this device while offline. {problem.message}</ErrorBanner>
+      )}
+      <ChosenSupplyRun readOnly={readOnly} />
+    </>
+  )
+}
+
+function ChosenSupplyRun({ readOnly }: { readOnly: boolean }) {
+  const layout = useBreakpoint()
+  const settings = useHouseholdSettings()
+  const [params] = useSearchParams()
+  const chosen = params.get(WEEK_PARAM)
+  // Read once, not on every render: a failed read reports a problem, which
+  // renders this again.
+  const [saved] = useState(() => keep(savedSchedule))
+
+  if (chosen !== null && !isMonday(chosen)) {
+    return <ErrorBanner>{`“${chosen}” is not the Monday of a week, as YYYY-MM-DD.`}</ErrorBanner>
+  }
+  // fetch rejects with a TypeError only when the network fails.
+  const schedule = settings.data ?? (settings.error instanceof TypeError ? saved : null)
+  if (settings.isError && !schedule) {
+    return <ErrorBanner onRetry={() => void settings.refetch()}>Couldn't load the household settings. {settings.error.message}</ErrorBanner>
+  }
+  if (!schedule) return <SkeletonGroups layout={layout} />
+  const week = chosen ?? defaultWeek(schedule, new Date())
+  return <WeekSupplyRun key={week} weekStart={week} timezone={schedule.timezone} layout={layout} readOnly={readOnly} />
+}
+
+// isMonday says whether date is a real YYYY-MM-DD Monday.
+function isMonday(date: string): boolean {
+  try {
+    return weekOf(date) === date
+  } catch {
+    return false
+  }
+}

web/src/shopping/api.ts

@@ -0,0 +1,579 @@
+import {
+  MutationObserver,
+  useMutation,
+  useMutationState,
+  useQuery,
+  useQueryClient,
+  type MutationObserverOptions,
+  type QueryClient,
+} from '@tanstack/react-query'
+import { useEffect, useReducer, useSyncExternalStore } from 'react'
+import { ApiError, useApi, type ApiClient } from '../api/index.ts'
+import { isRecord } from '../api/errors.ts'
+import { meQueryKey } from '../AuthBootstrap.tsx'
+import { oneOf } from '../dinners/api.ts'
+import { settleUnmadePushes } from '../plan/api.ts'
+import type { NetworkStatus } from '../pwa/networkStatus.ts'
+import { HOUSEHOLD_SETTINGS_KEY, type HouseholdSettings } from '../settings/api.ts'
+import {
+  dequeue,
+  enqueue,
+  keep,
+  markWillSync,
+  queued,
+  SAVED_KEY,
+  saveRun,
+  savedRun,
+  saveSchedule,
+  synced,
+  willSync,
+} from './offline.ts'
+
+export const SHOPPING_PATH = '/api/v1/shopping'
+
+// WEEK_PARAM names the search parameter choosing the week the Supply run
+// screen shows, its Monday as YYYY-MM-DD: /plan/shopping?week=2026-09-28.
+export const WEEK_PARAM = 'week'
+
+// supplyRunScreen is the Supply run screen on the week starting on Monday
+// weekStart.
+export function supplyRunScreen(weekStart: string): string {
+  return `/plan/shopping?${new URLSearchParams({ [WEEK_PARAM]: weekStart })}`
+}
+
+// supplyRunPath is the Supply run of the week starting on Monday weekStart.
+export function supplyRunPath(weekStart: string): string {
+  return `${SHOPPING_PATH}/${encodeURIComponent(weekStart)}`
+}
+
+// supplyRunKey is the query of the Supply run of the week starting on
+// weekStart.
+export function supplyRunKey(weekStart: string) {
+  return ['shopping', weekStart] as const
+}
+
+export const SUPPLY_RUN_STATUSES = ['current', 'archived'] as const
+
+// SupplyRunStatus is current until the week ends and the Supply run is
+// frozen into the Supply archive: archived, after which nothing on it
+// changes.
+export type SupplyRunStatus = (typeof SUPPLY_RUN_STATUSES)[number]
+
+// SupplyRunItem is one ingredient: qty is null when the recipe gives none,
+// and needed is false once it is marked "have it".
+export type SupplyRunItem = { id: string; name: string; qty: string | null; needed: boolean }
+
+// SupplyRunGroup is the items of one plan day's dinner: date is the plan
+// day, household-local YYYY-MM-DD.
+export type SupplyRunGroup = { dinner: { id: string; name: string }; date: string; items: SupplyRunItem[] }
+
+// Counts is how many of a Supply run's items are still to buy (needed) of
+// all of them (total).
+export type Counts = { needed_count: number; total_count: number }
+
+// SupplyRun is GET /api/v1/shopping/{weekStart}: label is the week label,
+// "Week 41 · Oct 5 – 11", title the AI's title once written, and
+// sent_to_chat_at when it was sent to Google Chat, if it was.
+export type SupplyRun = Counts & {
+  weekStart: string
+  label: string
+  title: string | null
+  status: SupplyRunStatus
+  sent_to_chat_at: Date | null
+  groups: SupplyRunGroup[]
+}
+
+function count(where: string, field: string, value: unknown): number {
+  if (!Number.isInteger(value) || (value as number) < 0) throw new Error(`${where}: ${field} ${JSON.stringify(value)} is not a count`)
+  return value as number
+}
+
+function parseCounts(where: string, body: Record<string, unknown>): Counts {
+  const counts = { needed_count: count(where, 'needed_count', body.needed_count), total_count: count(where, 'total_count', body.total_count) }
+  if (counts.needed_count > counts.total_count) throw new Error(`${where}: needed_count is more than total_count`)
+  return counts
+}
+
+function parseItem(where: string, body: unknown): SupplyRunItem {
+  if (
+    !isRecord(body) ||
+    typeof body.id !== 'string' ||
+    typeof body.name !== 'string' ||
+    (body.qty !== null && typeof body.qty !== 'string') ||
+    typeof body.needed !== 'boolean'
+  ) {
+    throw new Error(`${where}: response has an item that is not a Supply run item`)
+  }
+  return { id: body.id, name: body.name, qty: body.qty, needed: body.needed }
+}
+
+function parseGroup(where: string, body: unknown): SupplyRunGroup {
+  if (
+    !isRecord(body) ||
+    !isRecord(body.dinner) ||
+    typeof body.dinner.id !== 'string' ||
+    typeof body.dinner.name !== 'string' ||
+    typeof body.date !== 'string' ||
+    !Array.isArray(body.items)
+  ) {
+    throw new Error(`${where}: response has a group that is not a dinner's items`)
+  }
+  return {
+    dinner: { id: body.dinner.id, name: body.dinner.name },
+    date: body.date,
+    items: body.items.map((item) => parseItem(where, item)),
+  }
+}
+
+// sentAt reads sent_to_chat_at, an RFC 3339 instant or null.
+function sentAt(where: string, value: unknown): Date | null {
+  if (value === null) return null
+  const at = typeof value === 'string' ? new Date(value) : null
+  if (at === null || Number.isNaN(at.getTime())) {
+    throw new Error(`${where}: sent_to_chat_at ${JSON.stringify(value)} is not an instant`)
+  }
+  return at
+}
+
+export function parseSupplyRun(where: string, weekStart: string, body: unknown): SupplyRun {
+  if (
+    !isRecord(body) ||
+    body.weekStart !== weekStart ||
+    typeof body.label !== 'string' ||
+    (body.title !== null && typeof body.title !== 'string') ||
+    !Array.isArray(body.groups)
+  ) {
+    throw new Error(`${where}: response is not the Supply run of the week of ${weekStart}`)
+  }
+  return {
+    weekStart,
+    label: body.label,
+    title: body.title,
+    status: oneOf(where, 'status', SUPPLY_RUN_STATUSES, body.status),
+    sent_to_chat_at: sentAt(where, body.sent_to_chat_at),
+    ...parseCounts(where, body),
+    groups: body.groups.map((group) => parseGroup(where, group)),
+  }
+}
+
+// savedSupplyRun is the week's Supply run saved on this device, or undefined.
+function savedSupplyRun(weekStart: string): SupplyRun | undefined {
+  const saved = savedRun(weekStart)
+  return saved === undefined ? undefined : parseSupplyRun(`Saved ${SAVED_KEY}`, weekStart, saved)
+}
+
+// useSupplyRun is the Supply run of the week starting on Monday weekStart
+// (GET /api/v1/shopping/{weekStart}), or null when the week has none (404).
+// It starts from the Supply run saved on this device, if there is one, so
+// the list opens offline; the saved one is always read again.
+export function useSupplyRun(weekStart: string) {
+  const { apiRead } = useApi()
+  return useQuery({
+    queryKey: supplyRunKey(weekStart),
+    initialData: () => keep(() => savedSupplyRun(weekStart)),
+    initialDataUpdatedAt: 0,
+    queryFn: async (): Promise<SupplyRun | null> => {
+      const path = supplyRunPath(weekStart)
+      let body: unknown
+      try {
+        body = (await apiRead<unknown>(path)).body
+      } catch (error) {
+        if (error instanceof ApiError && error.status === 404) return null
+        throw error
+      }
+      return parseSupplyRun(`GET ${path}`, weekStart, body)
+    },
+  })
+}
+
+// useGenerateSupplyRun makes the week's Supply run from its plan (POST
+// /api/v1/shopping/{weekStart}/generate); the Supply run it answers with is
+// the one shown. Once made, from whichever screen, a push of the week whose
+// Supply run was not made is settled (settleUnmadePushes).
+export function useGenerateSupplyRun(weekStart: string) {
+  const { apiFetch } = useApi()
+  const queryClient = useQueryClient()
+  return useMutation({
+    onMutate: () => settleUnmadePushes(queryClient, weekStart),
+    mutationFn: async (): Promise<SupplyRun> => {
+      const path = `${supplyRunPath(weekStart)}/generate`
+      return parseSupplyRun(`POST ${path}`, weekStart, await apiFetch<unknown>(path, { method: 'POST' }))
+    },
+    onSuccess: (run, _, settle) => {
+      queryClient.setQueryData<SupplyRun | null>(supplyRunKey(weekStart), run)
+      settle()
+    },
+  })
+}
+
+// Toggle is one item marked to buy (needed) or "have it" (not needed).
+export type Toggle = { id: string; needed: boolean }
+
+// KeyedToggle is a toggle as sent: key tells it apart from any other toggle
+// of the same item, here and in the queue saved on this device.
+type KeyedToggle = Toggle & { key: string }
+
+// toggleKey keys the toggles of the week starting on weekStart.
+function toggleKey(weekStart: string) {
+  return ['shopping', weekStart, 'toggle'] as const
+}
+
+// TOGGLE_SCOPE is the one mutation scope of every toggle of every week, made
+// here or replayed from the queue saved on this device.
+const TOGGLE_SCOPE = 'shopping toggle'
+
+// Toggles is the toggles of one week's Supply run: shown, the Supply run
+// with those still pending laid over it, the items whose toggles will sync
+// once the server can be reached, the latest failed toggle no later toggle
+// of its item has superseded, and toggle to make another.
+export type Toggles = {
+  shown: SupplyRun
+  willSync: ReadonlySet<string>
+  failed: { toggle: Toggle; error: Error } | null
+  toggle: (toggle: Toggle) => void
+}
+
+// TOGGLE_DEADLINE is how long, in milliseconds, one try of a toggle — its
+// GET /api/v1/me, its PATCH and the /me refresh a csrf 403 to it makes — may
+// take before it counts as the server not answering. Only toggles have a
+// deadline: the API client sets none.
+export const TOGGLE_DEADLINE = 10_000
+
+// RETRY_FIRST and RETRY_CEILING bound, in milliseconds, how long a toggle
+// waits while the server cannot be reached before it is tried again anyway:
+// the first wait, doubled after each failed try up to the ceiling.
+export const RETRY_FIRST = 1_000
+export const RETRY_CEILING = 30_000
+
+// reachable resolves once network says the server can be reached — at once
+// when it says so now — or after delay milliseconds, whichever is first. The
+// server coming back says nothing by itself, and the browser sends no online
+// event when it never thought it was offline, so the toggle is tried again
+// after delay whatever network says.
+function reachable(network: NetworkStatus, delay: number): Promise<void> {
+  if (!network.offline()) return Promise.resolve()
+  return new Promise((resolve) => {
+    const done = () => {
+      clearTimeout(timer)
+      stop()
+      resolve()
+    }
+    const timer = setTimeout(done, delay)
+    const stop = network.subscribe(() => {
+      if (!network.offline()) done()
+    })
+  })
+}
+
+// toggleOptions is the mutation every toggle of the week's Supply run is,
+// made on the Supply run screen (useToggles) or replayed from the queue saved
+// on this device (useSupplyRunSync).
+//
+// Toggles are sent one at a time, in the order made, whatever their week
+// (one mutation scope, TOGGLE_SCOPE), so the counts each is answered with
+// include every toggle before it and none after, and a replayed toggle never
+// overlaps another replayed or made here. While the server cannot be
+// reached — the device is offline, or the toggle's PATCH failed with a
+// network error (fetch rejected with a TypeError), or a try ran past its
+// deadline (TOGGLE_DEADLINE) — a toggle waits, pending, and is tried again
+// once network says the server can be reached, or after a wait that doubles
+// from RETRY_FIRST up to RETRY_CEILING, whichever is first: those after it
+// wait behind it, in order. A try past its deadline is aborted and marks the
+// network failed, as a network error does, so the item says it will sync; the
+// server may have applied the aborted PATCH, and sending it again is safe for
+// the reason a replay is (see useSupplyRunSync). Any answer from the server
+// settles it: a refusal (a 400, 404, 409 or any other error response) or a
+// response that is not the item as toggled fails it, and it is not sent again. Before
+// a toggle is sent, GET /api/v1/me has answered, so it carries the session's
+// CSRF token even when the app opened offline.
+//
+// Every toggle is in the queue saved on this device (enqueue, by useToggles)
+// until it settles, so a reload replays those the server never answered.
+function toggleOptions(
+  weekStart: string,
+  api: ApiClient,
+  queryClient: QueryClient,
+): MutationObserverOptions<Counts, Error, KeyedToggle> {
+  const key = supplyRunKey(weekStart)
+  const mutationKey = toggleKey(weekStart)
+  return {
+    mutationKey,
+    scope: { id: TOGGLE_SCOPE },
+    networkMode: 'always',
+    retry: false,
+    gcTime: Infinity,
+    mutationFn: async ({ key, id, needed }: KeyedToggle): Promise<Counts> => {
+      const path = `${SHOPPING_PATH}/items/${encodeURIComponent(id)}`
+      const where = `PATCH ${path}`
+      let body: unknown
+      for (let failures = 0; ; failures++) {
+        if (api.network.offline()) markWillSync(key)
+        await reachable(api.network, Math.min(RETRY_FIRST * 2 ** failures, RETRY_CEILING))
+        const deadline = new AbortController()
+        const timer = setTimeout(() => deadline.abort(new DOMException(`${where}: no answer in time`, 'TimeoutError')), TOGGLE_DEADLINE)
+        try {
+          // Each try loads /me itself, under its deadline, rather than share
+          // a /me already in flight that may never answer.
+          if (queryClient.getQueryData(meQueryKey) === undefined) {
+            queryClient.setQueryData(meQueryKey, await api.loadMe(deadline.signal))
+          }
+          body = await api.apiFetch<unknown>(path, { method: 'PATCH', body: { needed }, signal: deadline.signal })
+          break
+        } catch (error) {
+          if (deadline.signal.aborted) {
+            api.network.requestFailed()
+            continue
+          }
+          // The API client marks the network offline as fetch rejects; a
+          // TypeError it did not mark is not a network failure.
+          if (!(error instanceof TypeError) || !api.network.offline()) throw error
+        } finally {
+          clearTimeout(timer)
+        }
+      }
+      if (!isRecord(body) || body.id !== id || body.needed !== needed) throw new Error(`${where}: response is not item ${id} as toggled`)
+      return parseCounts(where, body)
+    },
+    // A read of the Supply run sent before the toggle must not land after
+    // its answer, over it.
+    onMutate: () => queryClient.cancelQueries({ queryKey: key }),
+    onSuccess: (counts, { id, needed }) => {
+      queryClient.setQueryData<SupplyRun | null>(
+        key,
+        (run) =>
+          run && {
+            ...run,
+            ...counts,
+            groups: run.groups.map((group) => ({
+              ...group,
+              items: group.items.map((item) => (item.id === id ? { ...item, needed } : item)),
+            })),
+          },
+      )
+    },
+    onError: (error) => {
+      if (error instanceof ApiError && error.code === 'archived') void queryClient.invalidateQueries({ queryKey: key })
+    },
+    // This toggle is still pending as it settles, and those after it wait
+    // for it: the settled toggles of its item are the earlier ones. Settled,
+    // it leaves the saved queue.
+    onSettled: (_counts, _error, { key: settled, id }) => {
+      const cache = queryClient.getMutationCache()
+      for (const earlier of cache.findAll({ mutationKey, predicate: (m) => m.state.status !== 'pending' })) {
+        if ((earlier.state.variables as KeyedToggle).id === id) cache.remove(earlier)
+      }
+      keep(() => dequeue(settled))
+      synced(settled)
+    },
+  }
+}
+
+// useToggles marks items of the week's Supply run, already read, to buy or
+// "have it" (PATCH /api/v1/shopping/items/{id}; see toggleOptions). The
+// Supply run cached is the server's: a toggle's answer writes the item and
+// the counts it answers with there. Until then the toggle is pending and is
+// laid over the Supply run shown, so the item and the needed count change at
+// once; a refused toggle just stops being pending, which puts both back.
+// An item whose pending toggle was made, or waited, while the server could
+// not be reached will sync: it says so until that toggle settles, even once
+// the server can be reached again, and even when the screen is left and
+// opened again meanwhile (markWillSync keeps it with the page, not here).
+//
+// The Supply run and the toggles are read straight from the query and
+// mutation caches as each render begins, never from the caches' batched
+// notices, which can arrive apart: a toggle is in the mutation cache as
+// pending as soon as it is made, and its answer is in the query cache
+// before it stops being pending. Making a toggle renders again at once, so
+// the checkbox clicked never shows its old state; useSupplyRun and
+// useMutationState render again on every later change.
+//
+// A failed toggle stays failed, and shown, until a later toggle of its item
+// supersedes it, such as its Retry: a toggle of another item succeeding
+// does not hide it. So that a failure is never collected unseen, toggles are
+// kept (gcTime Infinity), and a settled toggle removes the earlier toggles
+// of its item it supersedes. A toggle refused because the week was frozen
+// into the Supply archive (409 archived), even one replayed after the device
+// was offline, reads the Supply run again, which then renders read-only.
+export function useToggles(weekStart: string): Toggles {
+  const api = useApi()
+  const queryClient = useQueryClient()
+  const key = supplyRunKey(weekStart)
+  const mutationKey = toggleKey(weekStart)
+  useSupplyRun(weekStart)
+  useMutationState({ filters: { mutationKey } })
+  const offline = useSyncExternalStore(api.network.subscribe, api.network.offline)
+  const [, renderAgain] = useReducer((n: number) => n + 1, 0)
+  const run = queryClient.getQueryData<SupplyRun | null>(key)
+  if (!run) throw new Error(`The week of ${weekStart} has no Supply run read to toggle items of.`)
+  const toggles = queryClient
+    .getMutationCache()
+    .findAll({ mutationKey })
+    .map((mutation) => ({ status: mutation.state.status, toggle: mutation.state.variables as KeyedToggle, error: mutation.state.error }))
+  const pending = toggles.filter((t) => t.status === 'pending').map((t) => t.toggle)
+  // Every change of the network status renders again, so each pending
+  // toggle seen while the server cannot be reached is marked.
+  if (offline) pending.forEach((t) => markWillSync(t.key))
+  const failed = toggles
+    .filter((t, i) => t.status === 'error' && !toggles.slice(i + 1).some((later) => later.toggle.id === t.toggle.id))
+    .at(-1)
+  const { mutate } = useMutation(toggleOptions(weekStart, api, queryClient))
+  return {
+    shown: shown(run, pending),
+    willSync: new Set(pending.filter((t) => willSync(t.key)).map((t) => t.id)),
+    failed: failed === undefined ? null : { toggle: { id: failed.toggle.id, needed: failed.toggle.needed }, error: failed.error! },
+    toggle: ({ id, needed }) => {
+      const queuedToggle = { key: crypto.randomUUID(), weekStart, id, needed }
+      keep(() => enqueue(queuedToggle))
+      mutate({ key: queuedToggle.key, id, needed })
+      renderAgain()
+    },
+  }
+}
+
+// useSupplyRunSync keeps, on this device, what the Supply run screen needs
+// to open offline — the household's schedule and each Supply run the server
+// sends (saveRun) — and replays, in the order made, the toggles saved in the
+// queue that are not already pending here: those of a page reloaded before
+// the server answered them.
+//
+// Replay is at-least-once, not exactly-once: a toggle leaves the saved queue
+// only once its answer settles here, so one the server applied just before a
+// reload is sent again. That duplicate is safe because a toggle sets needed
+// to a fixed value — the same PATCH applied twice leaves the item and the
+// counts as applying it once does — so no key is sent for the server to
+// deduplicate by.
+//
+// A replayed toggle's answer is written over the Supply run saved, so the
+// week's Supply run is cached from it first; it is still read again
+// (updatedAt 0) when the Supply run screen opens.
+export function useSupplyRunSync() {
+  const api = useApi()
+  const queryClient = useQueryClient()
+  useEffect(() => {
+    const stop = queryClient.getQueryCache().subscribe((event) => {
+      if (event.type !== 'updated' || event.action.type !== 'success') return
+      const [scope, week] = event.query.queryKey
+      const data: unknown = event.query.state.data
+      if (scope === 'shopping' && typeof week === 'string' && event.query.queryKey.length === 2) {
+        keep(() => saveRun(week, data as SupplyRun | null))
+      } else if (scope === HOUSEHOLD_SETTINGS_KEY[0] && week === HOUSEHOLD_SETTINGS_KEY[1]) {
+        keep(() => saveSchedule(data as HouseholdSettings))
+      }
+    })
+    const pending = new Set(
+      queryClient
+        .getMutationCache()
+        .findAll({ mutationKey: ['shopping'], predicate: (m) => m.state.status === 'pending' })
+        .map((m) => (m.state.variables as KeyedToggle).key),
+    )
+    for (const { key, weekStart, id, needed } of keep(queued) ?? []) {
+      if (pending.has(key)) continue
+      const runKey = supplyRunKey(weekStart)
+      if (queryClient.getQueryData(runKey) === undefined) {
+        const saved = keep(() => savedSupplyRun(weekStart))
+        if (saved !== undefined) queryClient.setQueryData(runKey, saved, { updatedAt: 0 })
+      }
+      // A refusal is the mutation's state, which the Supply run screen shows.
+      new MutationObserver(queryClient, toggleOptions(weekStart, api, queryClient)).mutate({ key, id, needed }).catch(() => {})
+    }
+    return stop
+  }, [api, queryClient])
+}
+
+// SupplyRunSync runs useSupplyRunSync for the whole app.
+export function SupplyRunSync(): null {
+  useSupplyRunSync()
+  return null
+}
+
+// shown is run as the household sees it with the pending toggles laid over
+// it: each item as its latest pending toggle marks it, and the needed count
+// moved to match.
+function shown(run: SupplyRun, pending: Toggle[]): SupplyRun {
+  const marked = new Map(pending.map((toggle) => [toggle.id, toggle.needed]))
+  let needed = run.needed_count
+  const groups = run.groups.map((group) => ({
+    ...group,
+    items: group.items.map((item) => {
+      const mark = marked.get(item.id)
+      if (mark === undefined || mark === item.needed) return item
+      needed += mark ? 1 : -1
+      return { ...item, needed: mark }
+    }),
+  }))
+  return { ...run, needed_count: needed, groups }
+}
+
+export const ARCHIVE_PERIODS = ['week', 'month', 'year'] as const
+
+// ArchivePeriod is what the Supply archive is grouped by.
+export type ArchivePeriod = (typeof ARCHIVE_PERIODS)[number]
+
+// ArchivePost is one week's Supply run in the Supply archive: label is the
+// week label, "Week 41 · Oct 5 – 11", which stands in for title while it is
+// null; onHandCount counts the items marked "have it", and dinners names the
+// dinners in day order. current is true for the household's current week.
+export type ArchivePost = {
+  weekStart: string
+  label: string
+  title: string | null
+  dinnerCount: number
+  itemCount: number
+  onHandCount: number
+  dinners: string[]
+  current: boolean
+}
+
+// ArchiveGroup is one period of the Supply archive — a week, a month
+// ("October 2026") or a year ("2026") — and its posts, newest first.
+export type ArchiveGroup = { key: string; heading: string; posts: ArchivePost[] }
+
+function parsePost(where: string, body: unknown): ArchivePost {
+  if (
+    !isRecord(body) ||
+    typeof body.weekStart !== 'string' ||
+    typeof body.label !== 'string' ||
+    (body.title !== null && typeof body.title !== 'string') ||
+    !Array.isArray(body.dinners) ||
+    !body.dinners.every((name) => typeof name === 'string') ||
+    typeof body.current !== 'boolean'
+  ) {
+    throw new Error(`${where}: response has a post that is not a Supply archive post`)
+  }
+  return {
+    weekStart: body.weekStart,
+    label: body.label,
+    title: body.title,
+    dinnerCount: count(where, 'dinnerCount', body.dinnerCount),
+    itemCount: count(where, 'itemCount', body.itemCount),
+    onHandCount: count(where, 'onHandCount', body.onHandCount),
+    dinners: body.dinners as string[],
+    current: body.current,
+  }
+}
+
+function parseArchiveGroup(where: string, body: unknown): ArchiveGroup {
+  if (!isRecord(body) || typeof body.key !== 'string' || typeof body.heading !== 'string' || !Array.isArray(body.posts)) {
+    throw new Error(`${where}: response has a period that is not a Supply archive period`)
+  }
+  return { key: body.key, heading: body.heading, posts: body.posts.map((post) => parsePost(where, post)) }
+}
+
+// useSupplyArchive is the Supply archive grouped by by, newest first (GET
+// /api/v1/shopping/archive?by=week|month|year): the server groups it in the
+// household's zone, so it is shown as answered, never grouped again here.
+export function useSupplyArchive(by: ArchivePeriod) {
+  const { apiRead } = useApi()
+  return useQuery({
+    queryKey: ['supply archive', by] as const,
+    queryFn: async (): Promise<ArchiveGroup[]> => {
+      const path = `${SHOPPING_PATH}/archive?${new URLSearchParams({ by })}`
+      const where = `GET ${path}`
+      const { body } = await apiRead<unknown>(path)
+      if (!isRecord(body) || body.by !== by || !Array.isArray(body.periods)) {
+        throw new Error(`${where}: response is not the Supply archive by ${by}`)
+      }
+      return body.periods.map((period) => parseArchiveGroup(where, period))
+    },
+  })
+}

web/src/shopping/offline.ts

@@ -0,0 +1,155 @@
+import { useSyncExternalStore } from 'react'
+import { isRecord } from '../api/errors.ts'
+
+// SAVED_KEY is the localStorage key holding, on this device, what the Supply
+// run screen needs to open offline — the household's schedule and the
+// Supply runs last read — and the toggles made that the server has not
+// answered yet, in the order they were made.
+export const SAVED_KEY = 'mealquest.supply-run'
+
+// SAVED_WEEKS is how many weeks' Supply runs are kept: this week's and next
+// week's are the only ones still current.
+const SAVED_WEEKS = 2
+
+// Schedule is the part of the household settings the Supply run screen
+// needs to choose the week and say times. The service worker never caches
+// the settings, so it is kept here for the screen to open offline.
+export type Schedule = { timezone: string; plan_draft_dow: number; plan_draft_time: string }
+
+// QueuedToggle is a toggle the server has not answered yet: key tells it
+// apart from any other toggle of the same item.
+export type QueuedToggle = { key: string; weekStart: string; id: string; needed: boolean }
+
+// Saved is the stored value: runs holds each week's Supply run as the server
+// last sent it, by its Monday.
+type Saved = { schedule: Schedule | null; runs: Record<string, unknown>; queue: QueuedToggle[] }
+
+function isSchedule(value: unknown): value is Schedule {
+  return (
+    isRecord(value) &&
+    typeof value.timezone === 'string' &&
+    Number.isInteger(value.plan_draft_dow) &&
+    typeof value.plan_draft_time === 'string'
+  )
+}
+
+function isQueuedToggle(value: unknown): value is QueuedToggle {
+  return (
+    isRecord(value) &&
+    typeof value.key === 'string' &&
+    typeof value.weekStart === 'string' &&
+    typeof value.id === 'string' &&
+    typeof value.needed === 'boolean'
+  )
+}
+
+// read is the stored value, empty when nothing is stored. A value that is not
+// one MealQuest stored is an error.
+function read(): Saved {
+  const text = window.localStorage.getItem(SAVED_KEY)
+  if (text === null) return { schedule: null, runs: {}, queue: [] }
+  const saved: unknown = JSON.parse(text)
+  if (
+    !isRecord(saved) ||
+    (saved.schedule !== null && !isSchedule(saved.schedule)) ||
+    !isRecord(saved.runs) ||
+    !Array.isArray(saved.queue) ||
+    !saved.queue.every(isQueuedToggle)
+  ) {
+    throw new Error(`The Supply run saved on this device (${SAVED_KEY}) is not one MealQuest saved.`)
+  }
+  return { schedule: saved.schedule as Schedule | null, runs: saved.runs, queue: saved.queue }
+}
+
+function write(change: (saved: Saved) => Saved) {
+  window.localStorage.setItem(SAVED_KEY, JSON.stringify(change(read())))
+}
+
+// savedSchedule is the household's schedule as last read, or null.
+export function savedSchedule(): Schedule | null {
+  return read().schedule
+}
+
+export function saveSchedule({ timezone, plan_draft_dow, plan_draft_time }: Schedule) {
+  write((saved) => ({ ...saved, schedule: { timezone, plan_draft_dow, plan_draft_time } }))
+}
+
+// savedRun is the week's Supply run as the server last sent it, unparsed, or
+// undefined when none is saved.
+export function savedRun(weekStart: string): unknown {
+  return read().runs[weekStart]
+}
+
+// saveRun keeps the week's Supply run as the server sent it, with the latest
+// weeks'. A week with none (null) or one frozen into the Supply archive is
+// not kept: nothing on it can change.
+export function saveRun(weekStart: string, run: { status: string } | null) {
+  write((saved) => {
+    const runs = { ...saved.runs }
+    delete runs[weekStart]
+    if (run !== null && run.status !== 'archived') runs[weekStart] = run
+    const latest = Object.keys(runs).sort().slice(-SAVED_WEEKS)
+    return { ...saved, runs: Object.fromEntries(latest.map((week) => [week, runs[week]])) }
+  })
+}
+
+// queued is the toggles the server has not answered, in the order made.
+export function queued(): QueuedToggle[] {
+  return read().queue
+}
+
+export function enqueue(toggle: QueuedToggle) {
+  write((saved) => ({ ...saved, queue: [...saved.queue, toggle] }))
+}
+
+export function dequeue(key: string) {
+  write((saved) => ({ ...saved, queue: saved.queue.filter((toggle) => toggle.key !== key) }))
+}
+
+// The keys of the toggles that will sync: made, or waiting, while the server
+// could not be reached, and not settled yet. They live here, with the page,
+// as the toggles in the mutation cache do: the Supply run screen is left and
+// opened again while a toggle is still pending, and starts with nothing of
+// its own.
+const syncing = new Set<string>()
+
+export function markWillSync(key: string) {
+  syncing.add(key)
+}
+
+export function willSync(key: string): boolean {
+  return syncing.has(key)
+}
+
+export function synced(key: string) {
+  syncing.delete(key)
+}
+
+// The latest failure to read or write the saved Supply run, which the Supply
+// run screen shows: a toggle that cannot be kept may be lost on a reload.
+let problem: Error | null = null
+const listeners = new Set<() => void>()
+
+// keep runs one read or write of the saved Supply run, and returns its
+// result, or undefined when it failed: the failure is reported to the Supply
+// run screen. Listeners hear of it after the current render.
+export function keep<T>(action: () => T): T | undefined {
+  try {
+    return action()
+  } catch (error) {
+    problem = error instanceof Error ? error : new Error(String(error))
+    queueMicrotask(() => listeners.forEach((listener) => listener()))
+    return undefined
+  }
+}
+
+function subscribe(listener: () => void) {
+  listeners.add(listener)
+  return () => listeners.delete(listener)
+}
+
+// useSavedProblem is the latest failure to read or write the saved Supply
+// run, or null.
+export function useSavedProblem(): Error | null {
+  return useSyncExternalStore(subscribe, () => problem)
+}

web/src/shopping/offlineQueue.test.tsx

@@ -0,0 +1,616 @@
+import { QueryClientProvider } from '@tanstack/react-query'
+import { act, fireEvent, render, screen, waitFor, within } from '@testing-library/react'
+import { MemoryRouter } from 'react-router'
+import { afterEach, beforeEach, describe, expect, it, vi, type Mock, type MockInstance } from 'vitest'
+import { ApiProvider, createApiClient, createQueryClient, createVerifiedSession } from '../api/index.ts'
+import { createNetworkStatus, type NetworkWindow } from '../pwa/networkStatus.ts'
+import { HOUSEHOLD_SETTINGS } from '../test/ApiProviders.tsx'
+import { errorResponse, fakeLocation, jsonResponse, ME } from '../test/fetchStub.ts'
+import { mockViewport } from '../test/matchMedia.ts'
+import { RETRY_FIRST, SupplyRunSync, TOGGLE_DEADLINE } from './api.ts'
+import { SAVED_KEY } from './offline.ts'
+import { SupplyRunPage } from './SupplyRunPage.tsx'
+
+const THIS_WEEK = '/api/v1/shopping/2026-10-05'
+const ITEM = (id: string) => `/api/v1/shopping/items/${id}`
+
+// Monday's tacos: two items to buy and one the household has.
+const ITEMS = [
+  { id: 'i1', name: 'Ground beef', qty: '1 lb', needed: true },
+  { id: 'i2', name: 'Corn tortillas', qty: '12', needed: true },
+  { id: 'i3', name: 'Taco seasoning', qty: '1 packet', needed: false },
+]
+
+// Next week's curry: one item to buy.
+const NEXT_ITEMS = [{ id: 'n1', name: 'Chicken thighs', qty: '2 lb', needed: true }]
+
+// The items of each week, by its Monday.
+const WEEKS: Record<string, typeof ITEMS> = { '2026-10-05': ITEMS, '2026-10-12': NEXT_ITEMS }
+
+function itemsOf(week: string) {
+  const items = WEEKS[week]
+  if (items === undefined) throw new Error(`no week ${week}`)
+  return items
+}
+
+// The browser's online flag; goOffline and goOnline change it and send the
+// page's window the event a browser sends.
+let onLine: boolean
+// The server can be reached: false, every request fails as fetch does when
+// the network fails, whatever onLine says.
+let reachable: boolean
+// The window of the page now open: a reload opens a new one, and the old
+// page hears nothing more.
+let win: NetworkWindow & EventTarget
+
+function openWindow() {
+  win = Object.assign(new EventTarget(), {
+    navigator: {
+      get onLine() {
+        return onLine
+      },
+    },
+  }) as unknown as NetworkWindow & EventTarget
+  return win
+}
+
+function goOffline() {
+  onLine = false
+  act(() => void win.dispatchEvent(new Event('offline')))
+}
+
+function goOnline() {
+  onLine = true
+  reachable = true
+  act(() => void win.dispatchEvent(new Event('online')))
+}
+
+// stubServer is the server's Supply runs of this week and next: a PATCH
+// marks its item and answers with its week's counts, unless refuse answers
+// it instead; when hold is given, the item is marked at once but the answer
+// waits for the promise hold returns, or until the request is aborted; holdMe
+// holds GET /api/v1/me's answer the same way. This week's counts as archived
+// once archive is called.
+function stubServer(
+  refuse: (id: string) => Response | undefined = () => undefined,
+  hold?: () => Promise<void>,
+  holdMe?: () => Promise<void>,
+) {
+  const needed = new Map(Object.values(WEEKS).flatMap((items) => items.map((item) => [item.id, item.needed] as const)))
+  let status = 'current'
+  // How many PATCHes are unanswered now, and the most there have been at once.
+  let inFlight = 0
+  let mostInFlight = 0
+  // How many GET /api/v1/me requests have been answered.
+  let meAnswered = 0
+  const counts = (week: string) => {
+    const marks = itemsOf(week).map((item) => needed.get(item.id)!)
+    return { needed_count: marks.filter(Boolean).length, total_count: marks.length }
+  }
+  const run = (week: string) => ({
+    weekStart: week,
+    label: week === '2026-10-05' ? 'Week 41 · Oct 5 – 11' : 'Week 42 · Oct 12 – 18',
+    title: null,
+    status: week === '2026-10-05' ? status : 'current',
+    sent_to_chat_at: null,
+    ...counts(week),
+    groups: [
+      {
+        dinner: { id: week === '2026-10-05' ? 'd0' : 'd1', name: week === '2026-10-05' ? 'Beef tacos' : 'Chicken curry' },
+        date: week,
+        items: itemsOf(week).map((item) => ({ ...item, needed: needed.get(item.id)! })),
+      },
+    ],
+  })
+  const fetchMock = vi.fn<typeof fetch>(async (input, init) => {
+    if (!onLine || !reachable) throw new TypeError('Failed to fetch')
+    const key = `${init?.method ?? 'GET'} ${String(input)}`
+    if (key === 'GET /api/v1/me') {
+      await answerAfter(init?.signal, holdMe)
+      meAnswered++
+      return jsonResponse(200, ME)
+    }
+    if (key === 'GET /api/v1/settings/household') return jsonResponse(200, HOUSEHOLD_SETTINGS)
+    if (key === `GET ${THIS_WEEK}`) return jsonResponse(200, run('2026-10-05'))
+    const week = Object.keys(WEEKS).find((w) => itemsOf(w).some((i) => key === `PATCH ${ITEM(i.id)}`))
+    if (week === undefined) throw new Error(`unexpected fetch: ${key}`)
+    const id = itemsOf(week).find((i) => key === `PATCH ${ITEM(i.id)}`)!.id
+    const refusal = refuse(id)
+    if (refusal !== undefined) return refusal
+    const body = JSON.parse(String(init?.body)) as { needed: boolean }
+    needed.set(id, body.needed)
+    const answer = jsonResponse(200, { id, needed: body.needed, ...counts(week) })
+    inFlight++
+    mostInFlight = Math.max(mostInFlight, inFlight)
+    try {
+      await answerAfter(init?.signal, hold)
+    } finally {
+      inFlight--
+    }
+    return answer
+  })
+  vi.stubGlobal('fetch', fetchMock)
+  return {
+    fetchMock,
+    run,
+    mostInFlight: () => mostInFlight,
+    meAnswered: () => meAnswered,
+    archive: () => {
+      status = 'archived'
+    },
+  }
+}
+
+// answerAfter resolves once the promise hold returns does, at once without
+// hold, or rejects with signal's reason once it aborts.
+function answerAfter(signal: AbortSignal | null | undefined, hold?: () => Promise<void>) {
+  return new Promise<void>((resolve, reject) => {
+    signal?.addEventListener('abort', () => reject(signal.reason as Error))
+    void (hold?.() ?? Promise.resolve()).then(resolve)
+  })
+}
+
+// held is a hold for stubServer whose answers wait until release is called,
+// each one released in turn.
+function held() {
+  const waiting: (() => void)[] = []
+  return {
+    hold: () => new Promise<void>((resolve) => waiting.push(resolve)),
+    waiting: () => waiting.length,
+    release: () => waiting.shift()!(),
+  }
+}
+
+// mes counts the GET /api/v1/me requests sent.
+function mes(fetchMock: Mock<typeof fetch>) {
+  return fetchMock.mock.calls.filter(([input, init]) => String(input) === '/api/v1/me' && (init?.method ?? 'GET') === 'GET').length
+}
+
+// patches lists the PATCHes sent, as "path body".
+function patches(fetchMock: Mock<typeof fetch>) {
+  return fetchMock.mock.calls.filter(([, init]) => init?.method === 'PATCH').map(([input, init]) => `${String(input)} ${String(init?.body)}`)
+}
+
+// queue is the toggles saved on this device, as "id needed".
+function queue(): string[] {
+  const saved = localStorage.getItem(SAVED_KEY)
+  if (saved === null) return []
+  return (JSON.parse(saved) as { queue: { id: string; needed: boolean }[] }).queue.map((t) => `${t.id} ${t.needed}`)
+}
+
+// openPage opens the Supply run screen in a new window, as the app does:
+// with SupplyRunSync, and with /me loaded unless the server cannot be
+// reached. leave goes to another screen of the same page, and reopen comes
+// back to the Supply run screen.
+async function openPage() {
+  const api = createApiClient(fakeLocation('/plan/shopping'), createNetworkStatus(openWindow()), createVerifiedSession(localStorage))
+  if (onLine && reachable) await api.loadMe()
+  const queryClient = createQueryClient()
+  const app = (onScreen: boolean) => (
+    <ApiProvider client={api}>
+      <QueryClientProvider client={queryClient}>
+        <MemoryRouter initialEntries={['/plan/shopping']}>
+          <SupplyRunSync />
+          {onScreen && <SupplyRunPage />}
+        </MemoryRouter>
+      </QueryClientProvider>
+    </ApiProvider>
+  )
+  const view = render(app(true))
+  return { ...view, leave: () => view.rerender(app(false)), reopen: () => view.rerender(app(true)) }
+}
+
+// reload ends the page open and its timers, as a reload does: a toggle it
+// was waiting to try again is never tried, by it, again.
+function reload(page: { unmount: () => void }) {
+  page.unmount()
+  vi.clearAllTimers()
+}
+
+async function advance(ms: number) {
+  await act(() => vi.advanceTimersByTimeAsync(ms))
+}
+
+// The page's setTimeout, watched: retrySecondTry waits for a timer to be set.
+let timers: MockInstance<typeof setTimeout>
+
+// retrySecondTry jumps past the wait before a toggle's second try — RETRY_FIRST
+// doubled by its failed first try — once that wait's timer is set, so the jump
+// never lands before the timer it is meant to fire.
+async function retrySecondTry() {
+  await waitFor(() => expect(timers).toHaveBeenCalledWith(expect.any(Function), 2 * RETRY_FIRST))
+  await advance(2 * RETRY_FIRST)
+}
+
+function checkbox(name: string) {
+  return screen.getByRole('checkbox', { name: new RegExp(`^${name}`) })
+}
+
+function row(name: string) {
+  return screen.getByText(name).closest('li')!
+}
+
+beforeEach(() => {
+  onLine = true
+  reachable = true
+  mockViewport(390)
+  // setTimeout moves with real time, and a test can jump past a deadline or
+  // a wait (advance).
+  vi.useFakeTimers({ toFake: ['Date', 'setTimeout', 'clearTimeout'], shouldAdvanceTime: true })
+  vi.setSystemTime(new Date('2026-10-07T16:00:00Z'))
+  timers = vi.spyOn(globalThis, 'setTimeout')
+})
+
+afterEach(() => {
+  vi.restoreAllMocks()
+  vi.useRealTimers()
+  vi.unstubAllGlobals()
+  Reflect.deleteProperty(window, 'matchMedia')
+})
+
+describe('offline toggle queue', () => {
+  it('applies toggles made offline at once, saves them in order and sends them in that order once online', async () => {
+    const { fetchMock } = stubServer()
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+
+    goOffline()
+    fireEvent.click(checkbox('Taco seasoning'))
+    fireEvent.click(checkbox('Ground beef'))
+    fireEvent.click(checkbox('Taco seasoning'))
+
+    // Applied here, counted, marked to sync and saved in order; nothing sent.
+    expect(checkbox('Taco seasoning')).not.toBeChecked()
+    expect(checkbox('Ground beef')).not.toBeChecked()
+    expect(screen.getByText('1 / 3')).toBeInTheDocument()
+    expect(within(row('Taco seasoning')).getByText('will sync')).toBeInTheDocument()
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+    expect(within(row('Corn tortillas')).queryByText('will sync')).not.toBeInTheDocument()
+    expect(queue()).toEqual(['i3 true', 'i1 false', 'i3 false'])
+    expect(patches(fetchMock)).toEqual([])
+
+    goOnline()
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(patches(fetchMock)).toEqual([
+      `${ITEM('i3')} {"needed":true}`,
+      `${ITEM('i1')} {"needed":false}`,
+      `${ITEM('i3')} {"needed":false}`,
+    ])
+    expect(screen.getByText('1 / 3')).toBeInTheDocument()
+    expect(checkbox('Taco seasoning')).not.toBeChecked()
+    expect(checkbox('Ground beef')).not.toBeChecked()
+    expect(screen.queryByText('will sync')).not.toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('queues a toggle whose PATCH fails with a network error and sends it again once back online', async () => {
+    const { fetchMock } = stubServer()
+    await openPage()
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Taco seasoning' }))
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(screen.getByText('3 / 3')).toBeInTheDocument()
+
+    // The browser still says online, but the server cannot be reached.
+    reachable = false
+    fireEvent.click(checkbox('Corn tortillas'))
+    expect(await within(row('Corn tortillas')).findByText('will sync')).toBeInTheDocument()
+    expect(patches(fetchMock)).toEqual([`${ITEM('i3')} {"needed":true}`, `${ITEM('i2')} {"needed":false}`])
+    expect(checkbox('Corn tortillas')).not.toBeChecked()
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(queue()).toEqual(['i2 false'])
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+
+    goOnline()
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(patches(fetchMock)).toEqual([`${ITEM('i3')} {"needed":true}`, `${ITEM('i2')} {"needed":false}`, `${ITEM('i2')} {"needed":false}`])
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(screen.queryByText('will sync')).not.toBeInTheDocument()
+  })
+
+  it('opens the saved list after a reload offline and replays the saved toggles in order once online', async () => {
+    const { fetchMock } = stubServer()
+    const first = await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+    goOffline()
+    fireEvent.click(checkbox('Taco seasoning'))
+    fireEvent.click(checkbox('Ground beef'))
+    expect(queue()).toEqual(['i3 true', 'i1 false'])
+
+    // Reload while offline: the settings, /me and the list cannot be read.
+    reload(first)
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+    expect(checkbox('Taco seasoning')).toBeChecked()
+    expect(checkbox('Ground beef')).not.toBeChecked()
+    expect(within(row('Taco seasoning')).getByText('will sync')).toBeInTheDocument()
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+    expect(patches(fetchMock)).toEqual([])
+
+    goOnline()
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(patches(fetchMock)).toEqual([`${ITEM('i3')} {"needed":true}`, `${ITEM('i1')} {"needed":false}`])
+    await waitFor(() => expect(screen.queryByText('will sync')).not.toBeInTheDocument())
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(checkbox('Taco seasoning')).toBeChecked()
+    expect(checkbox('Ground beef')).not.toBeChecked()
+  })
+
+  it('discards a queued toggle the server refuses because the list was archived, puts the count back and says so', async () => {
+    const server = stubServer(() => errorResponse(409, 'archived'))
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+
+    goOffline()
+    fireEvent.click(checkbox('Taco seasoning'))
+    expect(screen.getByText('3 / 3')).toBeInTheDocument()
+
+    server.archive()
+    goOnline()
+    const alert = await screen.findByRole('alert')
+    expect(alert).toHaveTextContent("Couldn't mark Taco seasoning to buy. archived message")
+    expect(await screen.findByText('Archived')).toBeInTheDocument()
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(within(row('Taco seasoning')).getByText('have it')).toBeInTheDocument()
+    expect(screen.queryByText('will sync')).not.toBeInTheDocument()
+    expect(queue()).toEqual([])
+    // Sent once, never again.
+    goOnline()
+    await waitFor(() => expect(patches(server.fetchMock)).toEqual([`${ITEM('i3')} {"needed":true}`]))
+  })
+
+  it('does not queue a toggle the server refuses: it is put back and says why', async () => {
+    const server = stubServer(() => errorResponse(400, 'invalid'))
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+
+    fireEvent.click(checkbox('Ground beef'))
+    expect(await screen.findByRole('alert')).toHaveTextContent("Couldn't mark Ground beef “have it”. invalid message")
+    expect(checkbox('Ground beef')).toBeChecked()
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(screen.queryByText('will sync')).not.toBeInTheDocument()
+    expect(queue()).toEqual([])
+
+    goOffline()
+    goOnline()
+    await waitFor(() => expect(patches(server.fetchMock)).toEqual([`${ITEM('i1')} {"needed":false}`]))
+  })
+})
+
+describe('offline toggle queue, replay', () => {
+  it('replays a queue spanning two weeks strictly in order, one PATCH at a time, a toggle made meanwhile after it', async () => {
+    const answers = held()
+    const server = stubServer(undefined, answers.hold)
+    const queued = [
+      { key: 'k1', weekStart: '2026-10-05', id: 'i3', needed: true },
+      { key: 'k2', weekStart: '2026-10-12', id: 'n1', needed: false },
+      { key: 'k3', weekStart: '2026-10-05', id: 'i1', needed: false },
+    ]
+    const runs = { '2026-10-05': server.run('2026-10-05'), '2026-10-12': server.run('2026-10-12') }
+    localStorage.setItem(SAVED_KEY, JSON.stringify({ schedule: null, runs, queue: queued }))
+
+    await openPage()
+    await waitFor(() => expect(answers.waiting()).toBe(1))
+    fireEvent.click(await screen.findByRole('checkbox', { name: 'Corn tortillas' }))
+    for (let sent = 1; sent <= 4; sent++) {
+      await waitFor(() => expect(patches(server.fetchMock)).toHaveLength(sent))
+      // The next one is not sent before this one is answered.
+      await new Promise((resolve) => setTimeout(resolve, 20))
+      expect(patches(server.fetchMock)).toHaveLength(sent)
+      act(() => answers.release())
+    }
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(patches(server.fetchMock)).toEqual([
+      `${ITEM('i3')} {"needed":true}`,
+      `${ITEM('n1')} {"needed":false}`,
+      `${ITEM('i1')} {"needed":false}`,
+      `${ITEM('i2')} {"needed":false}`,
+    ])
+    expect(server.mostInFlight()).toBe(1)
+    await waitFor(() => expect(screen.getByText('1 / 3')).toBeInTheDocument())
+  })
+
+  it('replays at least once: a toggle the server applied before a reload is sent again and leaves the item and count the same', async () => {
+    const answers = held()
+    const server = stubServer(undefined, answers.hold)
+    const first = await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+    fireEvent.click(checkbox('Taco seasoning'))
+    // The server applied it; the page reloads before its answer arrives.
+    await waitFor(() => expect(answers.waiting()).toBe(1))
+    expect(queue()).toEqual(['i3 true'])
+    reload(first)
+    act(() => answers.release())
+
+    await openPage()
+    await waitFor(() => expect(answers.waiting()).toBe(1))
+    act(() => answers.release())
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(patches(server.fetchMock)).toEqual([`${ITEM('i3')} {"needed":true}`, `${ITEM('i3')} {"needed":true}`])
+    await waitFor(() => expect(screen.getByText('3 / 3')).toBeInTheDocument())
+    expect(checkbox('Taco seasoning')).toBeChecked()
+    expect(server.run('2026-10-05')).toMatchObject({ needed_count: 3, total_count: 3 })
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('keeps "will sync" on a queued toggle until its delayed replay is answered', async () => {
+    const answers = held()
+    stubServer(undefined, answers.hold)
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+    goOffline()
+    fireEvent.click(checkbox('Ground beef'))
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+
+    goOnline()
+    await waitFor(() => expect(answers.waiting()).toBe(1))
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+    expect(queue()).toEqual(['i1 false'])
+
+    act(() => answers.release())
+    await waitFor(() => expect(screen.queryByText('will sync')).not.toBeInTheDocument())
+    expect(queue()).toEqual([])
+    expect(screen.getByText('1 / 3')).toBeInTheDocument()
+  })
+
+  it('aborts a PATCH that never answers at its deadline, keeps it pending and tries it again before the toggles after it', async () => {
+    let tries = 0
+    // The first PATCH never answers; every later one answers at once.
+    const server = stubServer(undefined, () => (++tries === 1 ? new Promise<void>(() => {}) : Promise.resolve()))
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+
+    fireEvent.click(checkbox('Taco seasoning'))
+    await waitFor(() => expect(patches(server.fetchMock)).toHaveLength(1))
+    fireEvent.click(checkbox('Ground beef'))
+    expect(queue()).toEqual(['i3 true', 'i1 false'])
+
+    // Past the deadline the hung PATCH is aborted; both still wait, in order.
+    await advance(TOGGLE_DEADLINE)
+    expect(await within(row('Taco seasoning')).findByText('will sync')).toBeInTheDocument()
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+    expect(patches(server.fetchMock)).toHaveLength(1)
+    expect(queue()).toEqual(['i3 true', 'i1 false'])
+
+    await retrySecondTry()
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(patches(server.fetchMock)).toEqual([
+      `${ITEM('i3')} {"needed":true}`,
+      `${ITEM('i3')} {"needed":true}`,
+      `${ITEM('i1')} {"needed":false}`,
+    ])
+    expect(server.mostInFlight()).toBe(1)
+    await waitFor(() => expect(screen.queryByText('will sync')).not.toBeInTheDocument())
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('abandons a GET /api/v1/me that never answers at its deadline and loads it afresh before the toggles after it', async () => {
+    let tries = 0
+    // The page loaded /me; the first toggle loads it again, and that /me never
+    // answers. Every later /me answers at once.
+    const server = stubServer(undefined, undefined, () => (++tries === 2 ? new Promise<void>(() => {}) : Promise.resolve()))
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+
+    fireEvent.click(checkbox('Taco seasoning'))
+    await waitFor(() => expect(tries).toBe(2))
+    fireEvent.click(checkbox('Ground beef'))
+    expect(queue()).toEqual(['i3 true', 'i1 false'])
+
+    // Past the deadline the hung /me is abandoned; both still wait, in order.
+    await advance(TOGGLE_DEADLINE)
+    expect(await within(row('Taco seasoning')).findByText('will sync')).toBeInTheDocument()
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+    expect(patches(server.fetchMock)).toEqual([])
+
+    // The next try sends a fresh /me, which the server answers.
+    await retrySecondTry()
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(mes(server.fetchMock)).toBe(3)
+    expect(patches(server.fetchMock)).toEqual([`${ITEM('i3')} {"needed":true}`, `${ITEM('i1')} {"needed":false}`])
+    expect(server.mostInFlight()).toBe(1)
+    await waitFor(() => expect(screen.queryByText('will sync')).not.toBeInTheDocument())
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('abandons the /me refresh of a csrf 403 that never answers at its deadline and refreshes afresh on the next try', async () => {
+    let tries = 0
+    // The session's token changed: each PATCH is refused for it until a /me
+    // after the first refusal has answered. The first such refresh never
+    // answers.
+    let refusedAt: number | null = null
+    const server = stubServer(
+      () => {
+        if (refusedAt !== null && server.meAnswered() > refusedAt) return undefined
+        refusedAt ??= server.meAnswered()
+        return errorResponse(403, 'csrf')
+      },
+      undefined,
+      () => (refusedAt !== null && ++tries === 1 ? new Promise<void>(() => {}) : Promise.resolve()),
+    )
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+
+    fireEvent.click(checkbox('Taco seasoning'))
+    await waitFor(() => expect(tries).toBe(1))
+    fireEvent.click(checkbox('Ground beef'))
+    expect(patches(server.fetchMock)).toHaveLength(1)
+
+    // Past the deadline the hung refresh is abandoned; both still wait, in order.
+    await advance(TOGGLE_DEADLINE)
+    expect(await within(row('Taco seasoning')).findByText('will sync')).toBeInTheDocument()
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+    expect(queue()).toEqual(['i3 true', 'i1 false'])
+
+    // The next try is refused again and sends a fresh refresh, which answers.
+    await retrySecondTry()
+    await waitFor(() => expect(queue()).toEqual([]))
+    expect(patches(server.fetchMock)).toEqual([
+      `${ITEM('i3')} {"needed":true}`,
+      `${ITEM('i3')} {"needed":true}`,
+      `${ITEM('i3')} {"needed":true}`,
+      `${ITEM('i1')} {"needed":false}`,
+    ])
+    await waitFor(() => expect(screen.queryByText('will sync')).not.toBeInTheDocument())
+    expect(screen.getByText('2 / 3')).toBeInTheDocument()
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
+  })
+
+  it('tries a toggle again once the server is back, with no online event from the browser', async () => {
+    const { fetchMock } = stubServer()
+    await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+
+    // The browser says online throughout; the server cannot be reached, then can.
+    reachable = false
+    fireEvent.click(checkbox('Corn tortillas'))
+    expect(await within(row('Corn tortillas')).findByText('will sync')).toBeInTheDocument()
+    reachable = true
+    expect(patches(fetchMock)).toEqual([])
+
+    // Nothing says the server is back: only the wait's timer tries it again.
+    await retrySecondTry()
+    await waitFor(() => expect(queue()).toEqual([]))
+    // The first try failed at GET /api/v1/me, before its PATCH.
+    expect(patches(fetchMock)).toEqual([`${ITEM('i2')} {"needed":false}`])
+    await waitFor(() => expect(screen.queryByText('will sync')).not.toBeInTheDocument())
+    expect(screen.getByText('1 / 3')).toBeInTheDocument()
+  })
+
+  it('keeps "will sync" when the Supply run screen is left and opened again while the replay is pending', async () => {
+    const answers = held()
+    stubServer(undefined, answers.hold)
+    const page = await openPage()
+    expect(await screen.findByText('2 / 3')).toBeInTheDocument()
+    goOffline()
+    fireEvent.click(checkbox('Ground beef'))
+    expect(within(row('Ground beef')).getByText('will sync')).toBeInTheDocument()
+
+    page.leave()
+    goOnline()
+    await waitFor(() => expect(answers.waiting()).toBe(1))
+    page.reopen()
+    expect(await within(row('Ground beef')).findByText('will sync')).toBeInTheDocument()
+    expect(queue()).toEqual(['i1 false'])
+
+    act(() => answers.release())
+    await waitFor(() => expect(screen.queryByText('will sync')).not.toBeInTheDocument())
+    expect(queue()).toEqual([])
+    expect(screen.getByText('1 / 3')).toBeInTheDocument()
+  })
+
+  it('says the saved list is unreadable when it is corrupt offline, without rendering again and again', async () => {
+    stubServer()
+    onLine = false
+    localStorage.setItem(SAVED_KEY, '{corrupt')
+    const getItem = vi.spyOn(Storage.prototype, 'getItem')
+    await openPage()
+
+    expect(await screen.findByText(/Couldn't load the household settings/)).toBeInTheDocument()
+    expect(screen.getByText(/can't be kept on this device while offline/)).toBeInTheDocument()
+    const reads = getItem.mock.calls.filter(([key]) => key === SAVED_KEY).length
+    await new Promise((resolve) => setTimeout(resolve, 50))
+    expect(getItem.mock.calls.filter(([key]) => key === SAVED_KEY)).toHaveLength(reads)
+  })
+})