Merge the feature branch into task/supply-archive-frozen-names (Maestro 22f80eb6 refresh)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -95,8 +95,8 @@ Columns ending in `_ct` hold AES-256-GCM ciphertext (via `secretbox`).
 | --- | --- |
 | `household_settings` | One row: timezone, dinner_time (17:30), reminder_time (16:30), review_time (09:00), plan_draft day/time (Fri 09:00), suggestions day/time (Sun 08:00), chat_autosend day/time (Sat 08:00), onboarding_completed_at, updates_seen_at. |
 | `recipes` | A real recipe page: source_url (unique), site_name, title, total/prep/cook minutes (the page's JSON-LD), yield, raw_jsonld, fetched_at; and its grounding: photo_id, method, difficulty, minutes_total (normalized prep to table). |
-| `recipe_ingredients` | recipe_id, position, raw_text, name, qty, unit, note. |
-| `recipe_steps` | recipe_id, position, text. |
+| `recipe_ingredients` | recipe_id, position (unique per recipe: the recipe order), raw_text, name, qty, unit, note. |
+| `recipe_steps` | recipe_id, position (unique per recipe: the recipe order), text. |
 | `photos` | source_url, local_path, width, height, sha256, fetched_at. |
 | `dinners` | The meal record and its lifecycle: name, normalized_name, status (`suggested` / `quest_log` / `tried` / `regular` / `archived`), origin, method, minutes_total, difficulty, cuisine, is_favorite, recipe_id, recipe_url (a pasted recipe link awaiting grounding), photo_id, grounding_status (`pending` / `grounded` / `failed` / `manual`), grounding_error (why grounding failed), grounding_revision (raised whenever a dinner is renamed, so only the latest `ground_dinner` job may write it and no candidate offered before the rename grounds it), updated_by. |
 | `suggestion_batches` | trigger, status, ai_run_id. |
@@ -105,7 +105,7 @@ Columns ending in `_ct` hold AES-256-GCM ciphertext (via `secretbox`).
 | `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 (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, chat_send_unconfirmed_at (a send to Google Chat recorded as begun before posting and cleared once its outcome is known; left set when it may or may not have posted), frozen_at. |
-| `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. |
+| `shopping_groups` / `shopping_items` | One group per plan day with ingredients: dinner_id, date, position (by date), frozen_dinner_name (the dinner's name when its list was frozen into the Supply archive, kept whatever it is later renamed; NULL while the list is current, which shows its dinners' names now; never empty). 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. |
@@ -121,6 +121,16 @@ Columns ending in `_ct` hold AES-256-GCM ciphertext (via `secretbox`).
 `recipes` holds a fetched recipe page; `dinners` holds the household's meal
 record and its lifecycle, optionally linked to a recipe and a photo.
 
+Migration `0018_recipe_item_position_unique` makes position unique per
+recipe and fails, so the service refuses to start, on a database already
+holding a duplicate. Before deploying it, check the database; both queries
+must return no rows:
+
+```sql
+SELECT recipe_id, position FROM recipe_ingredients GROUP BY 1, 2 HAVING count(*) > 1;
+SELECT recipe_id, position FROM recipe_steps GROUP BY 1, 2 HAVING count(*) > 1;
+```
+
 ## Dinner lifecycle
 
 ```
@@ -215,11 +225,10 @@ automatic** (D-021).
   raw_text}]` and `steps` the step texts, both in recipe position order and
   empty (`[]`) with no recipe, as for a dinner whose grounding is
   `pending` or `failed`; a recipe entered by hand has only `raw_text`.
-  Two items at one position leave recipe order unknown, so such a recipe
-  is 500 rather than shown out of order. `source` is `{site_name, url}`
-  of the page the recipe was fetched from, null for a manual recipe or
-  none, as `dinners.SourceOf` gives it — the one rule for every fetched
-  recipe's source, also used by idea results and recipe candidates. `url`
+  `source` is `{site_name, url}` of the page the recipe was fetched from,
+  null for a manual recipe or none, as `dinners.SourceOf` gives it — the
+  one rule for every fetched recipe's source, also used by idea results
+  and recipe candidates. `url`
   is the page's link only when it is free of secrets (https, no user,
   query or fragment), else null. `site_name` is the name the page gives
   its site (publisher or `og:site_name`), else the link's host without
@@ -644,7 +653,10 @@ automatic** (D-021).
 
 `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
+generating the list or changing an item is 409 `archived`. In the same
+transaction each group keeps its dinner's name as `frozen_dinner_name`, so
+the frozen list and its post show the names they had when frozen, whatever
+a dinner is renamed later. 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
@@ -1196,7 +1208,8 @@ Fake-clock tests of a schedule live in `internal/scheduler`, where
   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,
+  list's dinners in day order (as named when the list was frozen; the
+  current week's as named now) 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

internal/db/models.go

@@ -255,13 +255,14 @@ type Session struct {
 }
 
 type ShoppingGroup struct {
-	ID        string
-	ListID    string
-	DinnerID  string
-	Date      string
-	Position  int64
-	CreatedAt string
-	UpdatedAt string
+	ID               string
+	ListID           string
+	DinnerID         string
+	Date             string
+	Position         int64
+	CreatedAt        string
+	UpdatedAt        string
+	FrozenDinnerName sql.NullString
 }
 
 type ShoppingItem struct {

internal/db/querier.go

@@ -107,6 +107,9 @@ 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)
+	// Keeps the name each dinner of list list_id has now as its group's
+	// frozen_dinner_name, as the list is frozen into the Supply archive.
+	FreezeShoppingGroupNames(ctx context.Context, listID string) error
 	// Freezes list id into the Supply archive at frozen_at, unless it is
 	// frozen already.
 	FreezeShoppingList(ctx context.Context, arg FreezeShoppingListParams) (int64, error)
@@ -228,7 +231,8 @@ 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.
+	// The groups of list list_id with their dinner's name now, in list order.
+	// A group of a frozen list shows its frozen_dinner_name instead.
 	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)

internal/db/recipes.sql.go

@@ -220,7 +220,7 @@ func (q *Queries) GetRecipeBySourceURL(ctx context.Context, sourceUrl string) (R
 const listRecipeIngredients = `-- name: ListRecipeIngredients :many
 SELECT id, recipe_id, position, raw_text, name, qty, unit, note, created_at, updated_at FROM recipe_ingredients
 WHERE recipe_id = ?
-ORDER BY position, id
+ORDER BY position
 `
 
 func (q *Queries) ListRecipeIngredients(ctx context.Context, recipeID string) ([]RecipeIngredient, error) {
@@ -260,7 +260,7 @@ func (q *Queries) ListRecipeIngredients(ctx context.Context, recipeID string) ([
 const listRecipeSteps = `-- name: ListRecipeSteps :many
 SELECT id, recipe_id, position, text, created_at, updated_at FROM recipe_steps
 WHERE recipe_id = ?
-ORDER BY position, id
+ORDER BY position
 `
 
 func (q *Queries) ListRecipeSteps(ctx context.Context, recipeID string) ([]RecipeStep, error) {

internal/db/shopping.sql.go

@@ -155,6 +155,19 @@ func (q *Queries) DeleteShoppingItem(ctx context.Context, id string) error {
 	return err
 }
 
+const freezeShoppingGroupNames = `-- name: FreezeShoppingGroupNames :exec
+UPDATE shopping_groups
+SET frozen_dinner_name = (SELECT dinners.name FROM dinners WHERE dinners.id = shopping_groups.dinner_id)
+WHERE list_id = ?
+`
+
+// Keeps the name each dinner of list list_id has now as its group's
+// frozen_dinner_name, as the list is frozen into the Supply archive.
+func (q *Queries) FreezeShoppingGroupNames(ctx context.Context, listID string) error {
+	_, err := q.db.ExecContext(ctx, freezeShoppingGroupNames, listID)
+	return err
+}
+
 const freezeShoppingList = `-- name: FreezeShoppingList :execrows
 UPDATE shopping_lists
 SET status = 'archived', frozen_at = ?, updated_at = ?
@@ -235,7 +248,7 @@ func (q *Queries) GetShoppingList(ctx context.Context, weekStart string) (Shoppi
 }
 
 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
+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, shopping_groups.frozen_dinner_name, dinners.name AS dinner_name
 FROM shopping_groups
 JOIN dinners ON dinners.id = shopping_groups.dinner_id
 WHERE shopping_groups.list_id = ?
@@ -247,7 +260,8 @@ type ListShoppingGroupDinnersRow struct {
 	DinnerName    string
 }
 
-// The groups of list list_id with their dinner's name, in list order.
+// The groups of list list_id with their dinner's name now, in list order.
+// A group of a frozen list shows its frozen_dinner_name instead.
 func (q *Queries) ListShoppingGroupDinners(ctx context.Context, listID string) ([]ListShoppingGroupDinnersRow, error) {
 	rows, err := q.db.QueryContext(ctx, listShoppingGroupDinners, listID)
 	if err != nil {
@@ -265,6 +279,7 @@ func (q *Queries) ListShoppingGroupDinners(ctx context.Context, listID string) (
 			&i.ShoppingGroup.Position,
 			&i.ShoppingGroup.CreatedAt,
 			&i.ShoppingGroup.UpdatedAt,
+			&i.ShoppingGroup.FrozenDinnerName,
 			&i.DinnerName,
 		); err != nil {
 			return nil, err
@@ -281,7 +296,7 @@ func (q *Queries) ListShoppingGroupDinners(ctx context.Context, listID string) (
 }
 
 const listShoppingGroups = `-- name: ListShoppingGroups :many
-SELECT id, list_id, dinner_id, date, position, created_at, updated_at FROM shopping_groups
+SELECT id, list_id, dinner_id, date, position, created_at, updated_at, frozen_dinner_name FROM shopping_groups
 WHERE list_id = ?
 ORDER BY position, id
 `
@@ -304,6 +319,7 @@ func (q *Queries) ListShoppingGroups(ctx context.Context, listID string) ([]Shop
 			&i.Position,
 			&i.CreatedAt,
 			&i.UpdatedAt,
+			&i.FrozenDinnerName,
 		); err != nil {
 			return nil, err
 		}

internal/dinners/detail.go

@@ -157,10 +157,7 @@ func readRecipe(ctx context.Context, q *db.Queries, recipeID string, d *Detail)
 	if err != nil {
 		return fmt.Errorf("ingredients: %w", err)
 	}
-	for i, ing := range ings {
-		if i > 0 && ing.Position == ings[i-1].Position {
-			return duplicatePosition("ingredient", ing.Position)
-		}
+	for _, ing := range ings {
 		d.Ingredients = append(d.Ingredients, Ingredient{
 			Name:    nullString(ing.Name),
 			Qty:     nullString(ing.Qty),
@@ -173,10 +170,7 @@ func readRecipe(ctx context.Context, q *db.Queries, recipeID string, d *Detail)
 	if err != nil {
 		return fmt.Errorf("steps: %w", err)
 	}
-	for i, step := range steps {
-		if i > 0 && step.Position == steps[i-1].Position {
-			return duplicatePosition("step", step.Position)
-		}
+	for _, step := range steps {
 		d.Steps = append(d.Steps, step.Text)
 	}
 	return nil
@@ -280,11 +274,3 @@ func browserHost(u *url.URL) bool {
 	}
 	return true
 }
-
-// duplicatePosition is the error for two recipe items of kind at position.
-// Position is the only record of recipe order, and the id that breaks the
-// tie says nothing about it, so a recipe with a duplicate is refused rather
-// than shown in an order nobody can trust.
-func duplicatePosition(kind string, position int64) error {
-	return fmt.Errorf("two %ss at position %d: recipe order is unknown", kind, position)
-}

internal/server/dinnerdetail_test.go

@@ -72,8 +72,8 @@ func TestGetDinnerGroundedSideQuest(t *testing.T) {
 	}
 	for _, stmt := range []string{
 		`UPDATE dinners SET status = 'quest_log', origin = 'side_quest', is_favorite = 1 WHERE id = ?`,
-		`UPDATE recipe_ingredients SET position = 1 - position WHERE recipe_id = (SELECT recipe_id FROM dinners WHERE id = ?)`,
-		`UPDATE recipe_steps SET position = 1 - position WHERE recipe_id = (SELECT recipe_id FROM dinners WHERE id = ?)`,
+		`UPDATE recipe_ingredients SET position = 9 - position WHERE recipe_id = (SELECT recipe_id FROM dinners WHERE id = ?)`,
+		`UPDATE recipe_steps SET position = 9 - position WHERE recipe_id = (SELECT recipe_id FROM dinners WHERE id = ?)`,
 	} {
 		if _, err := e.st.Writer.Exec(stmt, id); err != nil {
 			t.Fatal(err)
@@ -492,25 +492,3 @@ func TestGetDinnerWhyPickedIsCreatingSuggestion(t *testing.T) {
 		t.Errorf("why_picked = %v, want %q", got.WhyPicked, reason)
 	}
 }
-
-// TestGetDinnerDuplicatePositionFails: a recipe with two ingredients or two
-// steps at one position has no order anyone can trust, so its detail is a
-// 500 rather than the recipe in some order.
-func TestGetDinnerDuplicatePositionFails(t *testing.T) {
-	t.Parallel()
-	e := newDinnersEnv(t)
-	for _, table := range []string{"recipe_ingredients", "recipe_steps"} {
-		id := createDinner(t, e.h, `{"name":"Family chili `+table+`"}`)
-		if rec, _ := callDinners(t, e.h, http.MethodPost, dinnersPath+"/"+id+"/ground",
-			`{"manual":{"ingredients":["1 lb beef","1 can beans"],"steps":["Brown.","Simmer."],"minutes":240,"method":"crockpot"}}`); rec.Code != http.StatusOK {
-			t.Fatalf("POST ground = %d: %s", rec.Code, rec.Body)
-		}
-		if _, err := e.st.Writer.Exec(`UPDATE `+table+` SET position = 0 WHERE recipe_id = (SELECT recipe_id FROM dinners WHERE id = ?)`, id); err != nil {
-			t.Fatal(err)
-		}
-		rec, _ := callDinners(t, e.h, http.MethodGet, dinnersPath+"/"+id, "")
-		if rec.Code != http.StatusInternalServerError || strings.Contains(rec.Body.String(), "Simmer.") || strings.Contains(rec.Body.String(), "1 lb beef") {
-			t.Errorf("GET with duplicate %s positions = %d: %s, want 500 and no recipe", table, rec.Code, rec.Body)
-		}
-	}
-}

internal/server/plans_test.go

@@ -108,7 +108,7 @@ func newPlansRouterTitled(t *testing.T, title shopping.Titler) plansEnv {
 		t.Fatal(err)
 	}
 	h, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), newTestSearch(t), newTestAI(t), chatSvc,
-		newTestDinners(t), newTestSuggest(t), svc, shop, googleSvc, newTestPush(t), newTestIdeas(t), newTestHome(t), runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestDinnersOn(t, st), newTestSuggest(t), svc, shop, googleSvc, newTestPush(t), newTestIdeas(t), newTestHome(t), runner, newTestPhotos(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/server_test.go

@@ -168,7 +168,12 @@ func newTestSearch(t *testing.T) *recipes.SearchSettingsService {
 // with its own unstarted job runner and a grounder that finds nothing.
 func newTestDinners(t *testing.T) *dinners.Service {
 	t.Helper()
-	st := newTestStore(t)
+	return newTestDinnersOn(t, newTestStore(t))
+}
+
+// newTestDinnersOn is newTestDinners over st.
+func newTestDinnersOn(t *testing.T, st *store.Store) *dinners.Service {
+	t.Helper()
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
 	runner, err := jobs.NewRunner(st, logger, 1)
 	if err != nil {

internal/server/shopping_test.go

@@ -75,7 +75,7 @@ func (e plansEnv) groundWeek(t *testing.T) {
 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 {
+		`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'; UPDATE shopping_groups SET frozen_dinner_name = (SELECT name FROM dinners WHERE dinners.id = dinner_id) WHERE list_id IN (SELECT id FROM shopping_lists WHERE frozen_at IS NOT NULL)`); err != nil {
 		t.Fatal(err)
 	}
 }
@@ -852,6 +852,73 @@ func TestSupplyArchive(t *testing.T) {
 	}
 }
 
+// TestSupplyArchiveKeepsFrozenNames freezes last week's Supply run, then
+// renames its dinner and this week's through the dinners API: the frozen
+// post and list keep the name the dinner had when frozen, while this
+// week's list, not frozen, shows the new name.
+func TestSupplyArchiveKeepsFrozenNames(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	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"})
+	current := e.weekSupplyRun(t, thisWeek, "Lemon Chicken", shopIng{"lemon", "1", ""})
+	if err := e.shop.Freeze(t.Context(), lastWeek); err != nil {
+		t.Fatal(err)
+	}
+	for id, name := range map[string]string{
+		last.Groups[0].Dinner.ID:    "Sunday Beef Stew",
+		current.Groups[0].Dinner.ID: "Lemon Garlic Chicken",
+	} {
+		if status, body := callShopping(t, e, http.MethodPatch, dinnersPath+"/"+id, `{"name":"`+name+`"}`, nil); status != http.StatusOK {
+			t.Fatalf("PATCH dinner %s = %d %v", id, status, body)
+		}
+	}
+
+	var got archiveJSON
+	if status, raw := callShopping(t, e, http.MethodGet, shoppingPath+"archive?by=week", "", &got); status != http.StatusOK {
+		t.Fatalf("GET archive = %d %v", status, raw)
+	}
+	var posts []string
+	for _, p := range got.Periods {
+		for _, post := range p.Posts {
+			posts = append(posts, fmt.Sprintf("%s %v current=%t", post.WeekStart, post.Dinners, post.Current))
+		}
+	}
+	want := []string{
+		thisWeek.String() + " [Lemon Garlic Chicken] current=true",
+		lastWeek.String() + " [Beef Stew] current=false",
+	}
+	if !reflect.DeepEqual(posts, want) {
+		t.Errorf("archive after rename =\n  %s\nwant\n  %s", strings.Join(posts, "\n  "), strings.Join(want, "\n  "))
+	}
+
+	for _, tc := range []struct {
+		week store.LocalDate
+		want string
+	}{
+		{lastWeek, "Monday " + lastWeek.String() + " Beef Stew: stewing beef [2 lb] needed"},
+		{thisWeek, "Monday " + thisWeek.String() + " Lemon Garlic Chicken: lemon [1] needed"},
+	} {
+		var l supplyRunJSON
+		if status, body := callShopping(t, e, http.MethodGet, shoppingPath+tc.week.String(), "", &l); status != http.StatusOK {
+			t.Fatalf("GET %s = %d %v", tc.week, status, body)
+		}
+		if got := l.render(); !reflect.DeepEqual(got, []string{tc.want}) {
+			t.Errorf("list %s after rename = %v, want [%s]", tc.week, got, tc.want)
+		}
+	}
+}
+
 // TestSupplyRunSendChat posts the week's Supply run to Google Chat once,
 // records sent_to_chat_at, answers a second send with the status as it
 // is, and posts again only with resend.

internal/shopping/archive.go

@@ -22,7 +22,9 @@ const (
 
 // 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
+// which it is read-only (Generate and SetNeeded are ErrFrozen). The list
+// keeps the names its dinners have as it is frozen, so its post in the
+// Supply archive shows them whatever a dinner is renamed later. 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
@@ -79,14 +81,25 @@ func (s *Service) freeze(ctx context.Context, weekStart store.LocalDate, now tim
 				"week", list.WeekStart, "list", list.ID, "error", err)
 		}
 	}
-	// A list frozen meanwhile is left as it is: the freeze is done.
+	// A list frozen meanwhile is left as it is, its names as they were
+	// frozen: the freeze is done.
 	stamp := store.Now().String()
-	if _, err := q.FreezeShoppingList(ctx, db.FreezeShoppingListParams{
-		FrozenAt: sql.NullString{String: stamp, Valid: true}, UpdatedAt: stamp, ID: list.ID,
-	}); err != nil {
-		return fmt.Errorf("shopping: freeze %s: %w", weekStart, err)
-	}
-	return nil
+	return s.st.WithTx(ctx, func(tx *sql.Tx) error {
+		q := db.New(tx)
+		n, err := q.FreezeShoppingList(ctx, db.FreezeShoppingListParams{
+			FrozenAt: sql.NullString{String: stamp, Valid: true}, UpdatedAt: stamp, ID: list.ID,
+		})
+		if err != nil {
+			return fmt.Errorf("shopping: freeze %s: %w", weekStart, err)
+		}
+		if n == 0 {
+			return nil
+		}
+		if err := q.FreezeShoppingGroupNames(ctx, list.ID); err != nil {
+			return fmt.Errorf("shopping: freeze %s: keep dinner names: %w", weekStart, err)
+		}
+		return nil
+	})
 }
 
 // freezeTitleJob is the title job of list as Generate would enqueue it:
@@ -145,7 +158,8 @@ type Post struct {
 	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 are the names of the list's dinners, in day order: as they
+	// were when the list was frozen, or as they are now while it is not.
 	Dinners []string
 	// Items is how many items the list has, and OnHand how many of them
 	// the household marked "have it".

internal/shopping/archive_test.go

@@ -422,7 +422,7 @@ func TestArchiveGroups(t *testing.T) {
 	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 {
+	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'; UPDATE shopping_groups SET frozen_dinner_name = (SELECT name FROM dinners WHERE dinners.id = dinner_id) WHERE list_id IN (SELECT id FROM shopping_lists WHERE frozen_at IS NOT NULL)`); err != nil {
 		t.Fatal(err)
 	}
 

internal/shopping/notify_test.go

@@ -152,7 +152,7 @@ func TestSendToChatFailuresRecordNothing(t *testing.T) {
 		t.Errorf("after failed sends sent_to_chat_at = %v, chat_send_unconfirmed_at = %v, %v, want both unset", l.SentToChatAt, l.ChatSendUnconfirmedAt, err)
 	}
 
-	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'`); err != nil {
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'; UPDATE shopping_groups SET frozen_dinner_name = (SELECT name FROM dinners WHERE dinners.id = dinner_id) WHERE list_id IN (SELECT id FROM shopping_lists WHERE frozen_at IS NOT NULL)`); err != nil {
 		t.Fatal(err)
 	}
 	posts := len(e.chat.Posts())

internal/shopping/shopping.go

@@ -492,7 +492,9 @@ func (s *Service) Get(ctx context.Context, weekStart store.LocalDate) (l List, e
 	return readList(ctx, q, list)
 }
 
-// readList reads the groups and items of list through q.
+// readList reads the groups and items of list through q. A group of a
+// frozen list is named as its dinner was when the list was frozen; one
+// with no such name is an error.
 func readList(ctx context.Context, q *db.Queries, list db.ShoppingList) (List, error) {
 	rows, err := q.ListShoppingGroupDinners(ctx, list.ID)
 	if err != nil {
@@ -512,8 +514,15 @@ func readList(ctx context.Context, q *db.Queries, list db.ShoppingList) (List, e
 	groups := make([]Group, 0, len(rows))
 	for _, r := range rows {
 		g := r.ShoppingGroup
+		name := r.DinnerName
+		if frozen(list) {
+			if !g.FrozenDinnerName.Valid {
+				return List{}, fmt.Errorf("shopping: group %s of frozen list %s has no frozen dinner name", g.ID, list.WeekStart)
+			}
+			name = g.FrozenDinnerName.String
+		}
 		groups = append(groups, Group{
-			ID: g.ID, DinnerID: g.DinnerID, DinnerName: r.DinnerName, Date: g.Date, Position: int(g.Position),
+			ID: g.ID, DinnerID: g.DinnerID, DinnerName: name, Date: g.Date, Position: int(g.Position),
 			Items: byGroup[g.ID],
 		})
 	}

internal/shopping/shopping_test.go

@@ -692,7 +692,7 @@ func TestGenerateRefusesFrozenList(t *testing.T) {
 	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 {
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'; UPDATE shopping_groups SET frozen_dinner_name = (SELECT name FROM dinners WHERE dinners.id = dinner_id) WHERE list_id IN (SELECT id FROM shopping_lists WHERE frozen_at IS NOT NULL)`); err != nil {
 		t.Fatal(err)
 	}
 	e.swap(t, "2026-10-12", "Pad Thai")
@@ -834,7 +834,7 @@ func TestSetNeededRefusesFrozenList(t *testing.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 {
+	if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'; UPDATE shopping_groups SET frozen_dinner_name = (SELECT name FROM dinners WHERE dinners.id = dinner_id) WHERE list_id IN (SELECT id FROM shopping_lists WHERE frozen_at IS NOT NULL)`); err != nil {
 		t.Fatal(err)
 	}
 

internal/shopping/title_test.go

@@ -239,7 +239,7 @@ 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 {
+		if _, err := e.st.Writer.Exec(`UPDATE shopping_lists SET status = 'archived', frozen_at = '2026-10-19T04:05:00Z'; UPDATE shopping_groups SET frozen_dinner_name = (SELECT name FROM dinners WHERE dinners.id = dinner_id) WHERE list_id IN (SELECT id FROM shopping_lists WHERE frozen_at IS NOT NULL)`); err != nil {
 			t.Error(err)
 		}
 	}

internal/store/migrate_test.go

@@ -177,8 +177,8 @@ 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,0016_shopping_list_untitled,0017_shopping_list_chat_send_unconfirmed,0020_site_name_from_page" {
-		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,0017_shopping_list_chat_send_unconfirmed,0020_site_name_from_page", got)
+	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,0017_shopping_list_chat_send_unconfirmed,0018_recipe_item_position_unique,0019_shopping_group_frozen_name,0020_site_name_from_page" {
+		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,0017_shopping_list_chat_send_unconfirmed,0018_recipe_item_position_unique,0019_shopping_group_frozen_name,0020_site_name_from_page", got)
 	}
 }
 
@@ -198,8 +198,8 @@ 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,0016_shopping_list_untitled,0017_shopping_list_chat_send_unconfirmed,0020_site_name_from_page" {
-		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,0017_shopping_list_chat_send_unconfirmed,0020_site_name_from_page", got)
+	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,0017_shopping_list_chat_send_unconfirmed,0018_recipe_item_position_unique,0019_shopping_group_frozen_name,0020_site_name_from_page" {
+		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,0017_shopping_list_chat_send_unconfirmed,0018_recipe_item_position_unique,0019_shopping_group_frozen_name,0020_site_name_from_page", got)
 	}
 	if !tableExists(t, s, "dinners") {
 		t.Error("table from 0001_init was not created")
@@ -924,6 +924,149 @@ func TestMigrateShoppingListChatSendUnconfirmed(t *testing.T) {
 	}
 }
 
+// seedRecipeItems inserts two recipes, each with an ingredient and a step
+// at position 0, then the extra statements.
+func seedRecipeItems(t *testing.T, s *Store, extra ...string) {
+	t.Helper()
+	stmts := []string{
+		`INSERT INTO recipes (id, source_url, title, raw_jsonld, fetched_at, created_at, updated_at)
+			VALUES ('recipe-1', 'https://example.com/chili', 'Chili', '{}', 'f', 'c', 'u')`,
+		`INSERT INTO recipes (id, source_url, title, raw_jsonld, fetched_at, created_at, updated_at)
+			VALUES ('recipe-2', 'https://example.com/curry', 'Curry', '{}', 'f', 'c', 'u')`,
+		`INSERT INTO recipe_ingredients (id, recipe_id, position, raw_text, created_at, updated_at)
+			VALUES ('ing-1', 'recipe-1', 0, '1 onion', 'c', 'u'), ('ing-2', 'recipe-2', 0, '1 lime', 'c', 'u')`,
+		`INSERT INTO recipe_steps (id, recipe_id, position, text, created_at, updated_at)
+			VALUES ('step-1', 'recipe-1', 0, 'Chop.', 'c', 'u'), ('step-2', 'recipe-2', 0, 'Squeeze.', 'c', 'u')`,
+	}
+	for _, stmt := range append(stmts, extra...) {
+		if _, err := s.Writer.Exec(stmt); err != nil {
+			t.Fatalf("seed: %v", err)
+		}
+	}
+}
+
+// TestMigrateRecipeItemPositionUnique applies 0018 over two recipes with
+// items at the same position: each recipe keeps its items, and a second
+// ingredient or step at a position its recipe already uses is refused.
+func TestMigrateRecipeItemPositionUnique(t *testing.T) {
+	ctx := context.Background()
+	s := openTestStore(t)
+	migrateBefore(t, s, "0018")
+	seedRecipeItems(t, s)
+
+	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+
+	var got string
+	if err := s.Reader.QueryRowContext(ctx, `SELECT
+		(SELECT group_concat(id || '@' || recipe_id || ':' || position, ',') FROM (SELECT * FROM recipe_ingredients ORDER BY id)) || ' / ' ||
+		(SELECT group_concat(id || '@' || recipe_id || ':' || position, ',') FROM (SELECT * FROM recipe_steps ORDER BY id))`).Scan(&got); err != nil {
+		t.Fatal(err)
+	}
+	if want := "ing-1@recipe-1:0,ing-2@recipe-2:0 / step-1@recipe-1:0,step-2@recipe-2:0"; got != want {
+		t.Errorf("recipe items after 0018 = %s, want %s", got, want)
+	}
+
+	for _, tc := range []struct{ name, stmt string }{
+		{"second ingredient at a position", `INSERT INTO recipe_ingredients (id, recipe_id, position, raw_text, created_at, updated_at)
+			VALUES ('ing-3', 'recipe-1', 0, '2 onions', 'c', 'u')`},
+		{"second step at a position", `INSERT INTO recipe_steps (id, recipe_id, position, text, created_at, updated_at)
+			VALUES ('step-3', 'recipe-1', 0, 'Dice.', 'c', 'u')`},
+		{"ingredient moved onto another's position", `UPDATE recipe_ingredients SET recipe_id = 'recipe-1' WHERE id = 'ing-2'`},
+		{"step moved onto another's position", `UPDATE recipe_steps SET recipe_id = 'recipe-1' WHERE id = 'step-2'`},
+	} {
+		if _, err := s.Writer.Exec(tc.stmt); err == nil || !strings.Contains(err.Error(), "UNIQUE constraint failed") {
+			t.Errorf("%s: error %v, want UNIQUE constraint failed", tc.name, err)
+		}
+	}
+}
+
+// TestMigrateRecipeItemPositionUniqueRefusesDuplicate applies 0018 over a
+// recipe already holding two ingredients, or two steps, at one position:
+// its order is unknown, so the migration fails and is not recorded.
+func TestMigrateRecipeItemPositionUniqueRefusesDuplicate(t *testing.T) {
+	for _, tc := range []struct{ table, stmt string }{
+		{"recipe_ingredients", `INSERT INTO recipe_ingredients (id, recipe_id, position, raw_text, created_at, updated_at)
+			VALUES ('ing-3', 'recipe-1', 0, '2 onions', 'c', 'u')`},
+		{"recipe_steps", `INSERT INTO recipe_steps (id, recipe_id, position, text, created_at, updated_at)
+			VALUES ('step-3', 'recipe-1', 0, 'Dice.', 'c', 'u')`},
+	} {
+		t.Run(tc.table, func(t *testing.T) {
+			ctx := context.Background()
+			s := openTestStore(t)
+			migrateBefore(t, s, "0018")
+			seedRecipeItems(t, s, tc.stmt)
+
+			err := Migrate(ctx, s.Writer, migrations.FS)
+			if err == nil || !strings.Contains(err.Error(), "UNIQUE constraint failed: "+tc.table+".recipe_id, "+tc.table+".position") {
+				t.Fatalf("Migrate = %v, want the duplicate position refused", err)
+			}
+			var n int
+			if err := s.Reader.QueryRowContext(ctx, `SELECT count(*) FROM schema_migrations WHERE version = '0018_recipe_item_position_unique'`).Scan(&n); err != nil {
+				t.Fatal(err)
+			}
+			if n != 0 {
+				t.Error("0018 recorded as applied")
+			}
+		})
+	}
+}
+
+// TestMigrateShoppingGroupFrozenName applies 0019 over a frozen list and
+// a current one: the frozen list's group takes its dinner's name now, the
+// current list's group has none, and a frozen name is never empty.
+func TestMigrateShoppingGroupFrozenName(t *testing.T) {
+	ctx := context.Background()
+	s := openTestStore(t)
+	migrateBefore(t, s, "0019")
+	for _, stmt := range []string{
+		`INSERT INTO dinners (id, name, normalized_name, status, origin, is_favorite, grounding_status, created_at, updated_at)
+			VALUES ('dinner-1', 'Beef Stew', 'beef stew', 'regular', 'regular', 0, 'manual', 'c', 'u'),
+			       ('dinner-2', 'Lemon Chicken', 'lemon chicken', 'regular', 'regular', 0, 'manual', 'c', 'u')`,
+		`INSERT INTO week_plans (id, week_start, status, created_at, updated_at)
+			VALUES ('plan-1', '2026-10-05', 'synced', 'c', 'u'),
+			       ('plan-2', '2026-10-12', 'synced', 'c', 'u')`,
+		`INSERT INTO shopping_lists (id, week_start, plan_id, status, frozen_at, created_at, updated_at)
+			VALUES ('list-1', '2026-10-05', 'plan-1', 'archived', 'f', 'c', 'u'),
+			       ('list-2', '2026-10-12', 'plan-2', 'current', NULL, 'c', 'u')`,
+		`INSERT INTO shopping_groups (id, list_id, dinner_id, date, position, created_at, updated_at)
+			VALUES ('group-1', 'list-1', 'dinner-1', '2026-10-05', 0, 'c', 'u'),
+			       ('group-2', 'list-2', 'dinner-2', '2026-10-12', 0, 'c', 'u')`,
+	} {
+		if _, err := s.Writer.Exec(stmt); err != nil {
+			t.Fatalf("seed: %v", err)
+		}
+	}
+
+	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+
+	rows, err := s.Reader.QueryContext(ctx, `SELECT id || '|' || COALESCE(frozen_dinner_name, 'NULL') || '|' || updated_at FROM shopping_groups ORDER BY id`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+	var got []string
+	for rows.Next() {
+		var row string
+		if err := rows.Scan(&row); err != nil {
+			t.Fatal(err)
+		}
+		got = append(got, row)
+	}
+	if err := rows.Err(); err != nil {
+		t.Fatal(err)
+	}
+	if want := []string{"group-1|Beef Stew|u", "group-2|NULL|u"}; strings.Join(got, ",") != strings.Join(want, ",") {
+		t.Errorf("shopping groups after 0019 = %v, want %v", got, want)
+	}
+	if _, err := s.Writer.Exec(`UPDATE shopping_groups SET frozen_dinner_name = '' WHERE id = 'group-1'`); err == nil || !strings.Contains(err.Error(), "CHECK constraint failed") {
+		t.Errorf("empty frozen name: error %v, want CHECK constraint failed", err)
+	}
+}
+
 // TestMigrateSiteNameFromPage applies 0020 over recipes and idea job
 // results stored when a page naming no site was stored under its host: a
 // stored name that could be a host — one with no space that is dotted, an

internal/store/schema_test.go

@@ -408,6 +408,8 @@ func TestSchemaUniqueConstraintsRejectDuplicates(t *testing.T) {
 		{"notification_outbox", []string{"event_key", "channel"}},
 		{"schedule_runs", []string{"schedule", "period_key"}},
 		{"notification_prefs", []string{"event"}},
+		{"recipe_ingredients", []string{"recipe_id", "position"}},
+		{"recipe_steps", []string{"recipe_id", "position"}},
 	}
 	s := seededStore(t)
 	for _, c := range cases {
@@ -445,6 +447,8 @@ func TestSchemaCompositeUniqueAllowsPartialOverlap(t *testing.T) {
 		{"same plan_date, different dinner", "rotation_reviews", "plan_date", "dinners", map[string]any{"dinner_id": rowID("dinners", 1)}},
 		{"same event_key, different channel", "notification_outbox", "event_key", "", map[string]any{"channel": "chat"}},
 		{"same period_key, different schedule", "schedule_runs", "period_key", "", map[string]any{"schedule": "week_rollover"}},
+		{"same position, different recipe", "recipe_ingredients", "position", "recipes", map[string]any{"recipe_id": rowID("recipes", 1)}},
+		{"same position, different recipe", "recipe_steps", "position", "recipes", map[string]any{"recipe_id": rowID("recipes", 1)}},
 	}
 	s := seededStore(t)
 	for _, c := range cases {

migrations/0018_recipe_item_position_unique.sql

@@ -0,0 +1,9 @@
+-- 0018_recipe_item_position_unique: position is the only record of recipe
+-- order, so a recipe never has two ingredients or two steps at one
+-- position. Writers replace a recipe's items whole, numbered from 0, and
+-- the detail read orders by position alone. A database already holding a
+-- duplicate fails this migration rather than keep an order nobody can
+-- trust.
+
+CREATE UNIQUE INDEX recipe_ingredients_recipe_position ON recipe_ingredients (recipe_id, position);
+CREATE UNIQUE INDEX recipe_steps_recipe_position ON recipe_steps (recipe_id, position);

migrations/0019_shopping_group_frozen_name.sql

@@ -0,0 +1,14 @@
+-- 0019_shopping_group_frozen_name: a Supply run frozen into the Supply
+-- archive keeps the names its dinners had when it was frozen. A dinner can
+-- be renamed at any time, so a frozen list reads each group's dinner name
+-- from frozen_dinner_name, never from the dinner, as 0012 does for a Pass.
+-- Only a group of a frozen list has one; a current list reads its dinners'
+-- names live. A list frozen before this takes its dinners' names now.
+
+ALTER TABLE shopping_groups ADD COLUMN frozen_dinner_name TEXT CHECK (frozen_dinner_name <> '');
+
+UPDATE shopping_groups
+SET frozen_dinner_name = (SELECT dinners.name FROM dinners WHERE dinners.id = shopping_groups.dinner_id)
+WHERE list_id IN (
+	SELECT id FROM shopping_lists WHERE status = 'archived' OR frozen_at IS NOT NULL
+);

migrations/queries/recipes.sql

@@ -48,7 +48,7 @@ INSERT INTO recipe_ingredients (
 -- name: ListRecipeIngredients :many
 SELECT * FROM recipe_ingredients
 WHERE recipe_id = ?
-ORDER BY position, id;
+ORDER BY position;
 
 -- name: DeleteRecipeIngredients :exec
 DELETE FROM recipe_ingredients
@@ -64,7 +64,7 @@ INSERT INTO recipe_steps (
 -- name: ListRecipeSteps :many
 SELECT * FROM recipe_steps
 WHERE recipe_id = ?
-ORDER BY position, id;
+ORDER BY position;
 
 -- name: DeleteRecipeSteps :exec
 DELETE FROM recipe_steps

migrations/queries/shopping.sql

@@ -60,7 +60,8 @@ DELETE FROM shopping_items
 WHERE id = ?;
 
 -- name: ListShoppingGroupDinners :many
--- The groups of list list_id with their dinner's name, in list order.
+-- The groups of list list_id with their dinner's name now, in list order.
+-- A group of a frozen list shows its frozen_dinner_name instead.
 SELECT sqlc.embed(shopping_groups), dinners.name AS dinner_name
 FROM shopping_groups
 JOIN dinners ON dinners.id = shopping_groups.dinner_id
@@ -117,6 +118,13 @@ UPDATE shopping_lists
 SET status = 'archived', frozen_at = ?, updated_at = ?
 WHERE id = ? AND frozen_at IS NULL;
 
+-- name: FreezeShoppingGroupNames :exec
+-- Keeps the name each dinner of list list_id has now as its group's
+-- frozen_dinner_name, as the list is frozen into the Supply archive.
+UPDATE shopping_groups
+SET frozen_dinner_name = (SELECT dinners.name FROM dinners WHERE dinners.id = shopping_groups.dinner_id)
+WHERE list_id = ?;
+
 -- name: ListShoppingListsThrough :many
 -- The Supply runs of the weeks starting on or before week_start, newest
 -- week first.