Fix the 0019 migration header comment (task 22f80eb6)

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

docs/ARCHITECTURE.md

@@ -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. |
@@ -635,7 +635,10 @@ 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
@@ -1120,7 +1123,10 @@ Fake-clock tests of a schedule live in `internal/scheduler`, where
   - The week's Supply run (Feature 17) is made from a pushed plan: after
     a successful `Push`, the handler runs `shopping.GeneratePushed` for
     the week at the plan revision `Push` pushed, and the 200 answer
-    carries `supply_run: {status, error}`. `status` is `generated`;
+    carries `supply_run: {status, error, title_job_id}`. `title_job_id` is
+    the `title_supply_run` job titling a generated list, as for `POST
+    /shopping/{weekStart}/generate`; null when the list already has its
+    title or was not generated. `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
@@ -1143,8 +1149,12 @@ Fake-clock tests of a schedule live in `internal/scheduler`, where
   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.
+  `skipped: [{date, dinner_id, dinner_name, reason}]` and
+  `title_job_id`, the `title_supply_run` job titling the list, which
+  `GET /api/v1/jobs/{id}` reports on (failed `title_failed` when the title
+  could not be written); null when the list already has its title. 404
+  when the week has no plan, 409 `archived` when its list is in the Supply
+  archive.
 - `POST /api/v1/shopping/{weekStart}/send-chat` (CSRF-checked) takes
   `{}` or `{"resend": true}` and posts the Supply run to Google Chat
   through `chat.PostSupplyRun`, in the week's thread: "Supply run · " and
@@ -1180,7 +1190,8 @@ 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/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/server/plans.go

@@ -111,10 +111,13 @@ type pushedPlan struct {
 // 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.
+// is generated. title_job_id is the job titling a generated Supply run,
+// which GET /jobs/{id} reports on; null when it already has its title or
+// was not generated.
 type pushedSupplyRun struct {
-	Status string    `json:"status"`
-	Error  *apiError `json:"error"`
+	Status     string    `json:"status"`
+	Error      *apiError `json:"error"`
+	TitleJobID *string   `json:"title_job_id"`
 }
 
 // postPlanPush pushes the week's plan to the chosen Google calendar
@@ -143,7 +146,9 @@ func postPlanPush(logger *slog.Logger, svc *plan.Service, shop *shopping.Service
 		// gone.
 		ctx := context.WithoutCancel(r.Context())
 		run := pushedSupplyRun{Status: "generated"}
-		if _, err := shop.GeneratePushed(ctx, week, revision); errors.Is(err, shopping.ErrFrozen) {
+		if g, err := shop.GeneratePushed(ctx, week, revision); err == nil {
+			run.TitleJobID = g.TitleJobID
+		} else if 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) {
@@ -153,7 +158,7 @@ func postPlanPush(logger *slog.Logger, svc *plan.Service, shop *shopping.Service
 				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 {
+		} else {
 			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",

internal/server/plans_test.go

@@ -107,7 +107,7 @@ 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

@@ -167,7 +167,12 @@ 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.go

@@ -60,10 +60,13 @@ type supplyRunItem struct {
 }
 
 // generatedSupplyRun is the POST /shopping/{weekStart}/generate answer:
-// the Supply run as made, and the plan days with nothing to shop for.
+// the Supply run as made, the plan days with nothing to shop for, and the
+// title_job_id of the job titling it, which GET /jobs/{id} reports on;
+// null when the Supply run already has its title.
 type generatedSupplyRun struct {
 	supplyRun
-	Skipped []shopping.SkippedDay `json:"skipped"`
+	Skipped    []shopping.SkippedDay `json:"skipped"`
+	TitleJobID *string               `json:"title_job_id"`
 }
 
 // sendChatRequest is the POST /shopping/{weekStart}/send-chat body:
@@ -108,7 +111,7 @@ func getSupplyRun(logger *slog.Logger, svc *shopping.Service) http.HandlerFunc {
 }
 
 // postSupplyRunGenerate makes, or remakes, the week's Supply run from its
-// plan and answers with it and the plan days it skipped.
+// plan and answers with it, the plan days it skipped and its title job.
 func postSupplyRunGenerate(logger *slog.Logger, svc *shopping.Service) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		week, ok := weekStartOrFail(w, r, logger)
@@ -129,7 +132,7 @@ func postSupplyRunGenerate(logger *slog.Logger, svc *shopping.Service) http.Hand
 		if skipped == nil {
 			skipped = []shopping.SkippedDay{}
 		}
-		writeJSON(w, r, logger, http.StatusOK, generatedSupplyRun{supplyRun: out, Skipped: skipped})
+		writeJSON(w, r, logger, http.StatusOK, generatedSupplyRun{supplyRun: out, Skipped: skipped, TitleJobID: g.TitleJobID})
 	}
 }
 

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)
 	}
 }
@@ -186,7 +186,7 @@ func TestSupplyRunShape(t *testing.T) {
 	if status != http.StatusOK {
 		t.Fatalf("generate = %d %v", status, raw)
 	}
-	wantTop := []string{"chat_send_unconfirmed_at", "groups", "label", "needed_count", "sent_to_chat_at", "skipped", "status", "title", "total_count", "weekStart"}
+	wantTop := []string{"chat_send_unconfirmed_at", "groups", "label", "needed_count", "sent_to_chat_at", "skipped", "status", "title", "title_job_id", "total_count", "weekStart"}
 	if got := keys(raw); !reflect.DeepEqual(got, wantTop) {
 		t.Errorf("generate fields = %v, want %v", got, wantTop)
 	}
@@ -199,7 +199,7 @@ func TestSupplyRunShape(t *testing.T) {
 	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" })) {
+	if k := keys(raw); !reflect.DeepEqual(k, slices.DeleteFunc(slices.Clone(wantTop), func(s string) bool { return s == "skipped" || s == "title_job_id" })) {
 		t.Errorf("GET fields = %v", k)
 	}
 	group := raw["groups"].([]any)[0].(map[string]any)
@@ -376,8 +376,12 @@ func TestPushPlanMakesSupplyRun(t *testing.T) {
 	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)
+	run, _ := body["supply_run"].(map[string]any)
+	if k := keys(run); run["status"] != "generated" || run["error"] != nil || !reflect.DeepEqual(k, []string{"error", "status", "title_job_id"}) {
+		t.Errorf("supply_run = %v, want generated with no error", run)
+	}
+	if job := titleJob(t, e, run["title_job_id"]); job["status"] != "queued" {
+		t.Errorf("title job = %v, want queued: no runner in this test", job)
 	}
 	var l supplyRunJSON
 	if status, got := callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &l); status != http.StatusOK {
@@ -467,9 +471,11 @@ func TestPushPlanDoesNotWaitForTitle(t *testing.T) {
 	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)
+	run, _ := body["supply_run"].(map[string]any)
+	if run["status"] != "generated" || run["error"] != nil {
+		t.Errorf("supply_run = %v, want generated with no error", run)
 	}
+	titleJobID, _ := run["title_job_id"].(string)
 	held.waitEntered(t)
 	var l supplyRunJSON
 	callShopping(t, e, http.MethodGet, shoppingPath+"2026-10-12", "", &l)
@@ -478,6 +484,7 @@ func TestPushPlanDoesNotWaitForTitle(t *testing.T) {
 	}
 
 	close(held.release)
+	wantTitleJobSucceeded(t, e, titleJobID)
 	if got := e.waitTitled(t); got != "Chili and Friends" {
 		t.Errorf("title = %q, want the title job's", got)
 	}
@@ -493,7 +500,8 @@ func TestSupplyRunGenerateDoesNotWaitForTitle(t *testing.T) {
 	e.startRunner(t)
 
 	var l supplyRunJSON
-	if status, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &l); status != http.StatusOK {
+	status, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", &l)
+	if status != http.StatusOK {
 		t.Fatalf("generate = %d %v", status, body)
 	}
 	if l.Title != nil {
@@ -502,12 +510,66 @@ func TestSupplyRunGenerateDoesNotWaitForTitle(t *testing.T) {
 	if !reflect.DeepEqual(l.render(), weekLines) {
 		t.Errorf("generated = %v, want %v", l.render(), weekLines)
 	}
+	titleJobID, _ := body["title_job_id"].(string)
 	held.waitEntered(t)
 
 	close(held.release)
+	wantTitleJobSucceeded(t, e, titleJobID)
 	if got := e.waitTitled(t); got != "Chili and Friends" {
 		t.Errorf("title = %q, want the title job's", got)
 	}
+	if _, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", nil); body["title_job_id"] != nil {
+		t.Errorf("remake title_job_id = %v, want null: the Supply run has its title", body["title_job_id"])
+	}
+}
+
+// TestSupplyRunGenerateTitleJobFails: a title job that cannot title the
+// Supply run is reported failed with title_failed by GET /jobs/{id}, and
+// the week's next generation answers with a new title job.
+func TestSupplyRunGenerateTitleJobFails(t *testing.T) {
+	t.Parallel()
+	e := newPlansRouter(t)
+	e.groundWeek(t)
+	e.startRunner(t)
+
+	_, body := callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", nil)
+	first := titleJob(t, e, body["title_job_id"])
+	job := waitJob(t, e.h, first["id"].(string))
+	if job["status"] != "failed" || job["error"] != shopping.ReasonTitleFailed {
+		t.Errorf("title job = %v, want failed %s", job, shopping.ReasonTitleFailed)
+	}
+
+	_, body = callShopping(t, e, http.MethodPost, shoppingPath+"2026-10-12/generate", "", nil)
+	if second := titleJob(t, e, body["title_job_id"]); second["id"] == first["id"] {
+		t.Errorf("retry title_job_id = %v, want a new job", second["id"])
+	}
+}
+
+// titleJob returns the title_supply_run job id, as GET /jobs/{id} reports
+// it; id must be a job id string.
+func titleJob(t *testing.T, e plansEnv, id any) map[string]any {
+	t.Helper()
+	s, ok := id.(string)
+	if !ok || s == "" {
+		t.Fatalf("title_job_id = %v, want a job id", id)
+	}
+	rec, job := callDinners(t, e.h, http.MethodGet, "/api/v1/jobs/"+s, "")
+	if rec.Code != http.StatusOK || job["kind"] != shopping.KindTitleSupplyRun {
+		t.Fatalf("GET title job = %d %s, want a %s job", rec.Code, rec.Body, shopping.KindTitleSupplyRun)
+	}
+	return job
+}
+
+// wantTitleJobSucceeded waits for title job id to finish and fails t
+// unless GET /jobs/{id} reports it succeeded with the title written.
+func wantTitleJobSucceeded(t *testing.T, e plansEnv, id string) {
+	t.Helper()
+	titleJob(t, e, id)
+	job := waitJob(t, e.h, id)
+	result, _ := job["result"].(map[string]any)
+	if job["status"] != "succeeded" || result["title"] != "Chili and Friends" {
+		t.Errorf("title job = %v, want succeeded with the title", job)
+	}
 }
 
 // TestFailedPushMakesNoSupplyRun: a push Calendar refused makes no Supply
@@ -546,7 +608,7 @@ func TestPushPlanSupplyRunFails(t *testing.T) {
 		"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,
-	}}
+	}, "title_job_id": nil}
 	if !reflect.DeepEqual(body["supply_run"], want) {
 		t.Errorf("supply_run = %v, want %v", body["supply_run"], want)
 	}
@@ -599,7 +661,7 @@ func TestPushPlanEditedBeforeSupplyRun(t *testing.T) {
 		"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,
-	}}
+	}, "title_job_id": nil}
 	if !reflect.DeepEqual(body["supply_run"], want) {
 		t.Errorf("supply_run = %v, want %v", body["supply_run"], want)
 	}
@@ -632,7 +694,7 @@ func TestPushPlanLeavesArchivedSupplyRun(t *testing.T) {
 		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" {
+	if apiErr, _ := run["error"].(map[string]any); run["status"] != "archived" || apiErr["code"] != "archived" || run["title_job_id"] != nil {
 		t.Errorf("supply_run = %v, want archived", body["supply_run"])
 	}
 	var l supplyRunJSON
@@ -790,6 +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)
 		}
 	}
@@ -311,3 +311,38 @@ func TestGenerateTitleOverlapAcrossRename(t *testing.T) {
 		t.Errorf("stored title = %v, want one of the two titles", deref(got))
 	}
 }
+
+// TestGenerateTitleNotStoredOnReplacedList: a list replaced by a new
+// untitled list of the same week once archive_title has answered, before
+// its title is stored, keeps the replacement untitled; the old list's
+// title job fails, and the failure is logged.
+func TestGenerateTitleNotStoredOnReplacedList(t *testing.T) {
+	e := titleWeek(t)
+	e.model.QueueGenerate(titled("Noodles, Tacos and Chili"))
+	e.afterTitle = func() {
+		for _, stmt := range []string{
+			`DELETE FROM shopping_items WHERE group_id IN (SELECT id FROM shopping_groups WHERE list_id IN (SELECT id FROM shopping_lists WHERE week_start = ?1))`,
+			`DELETE FROM shopping_groups WHERE list_id IN (SELECT id FROM shopping_lists WHERE week_start = ?1)`,
+			`UPDATE shopping_lists SET id = 'replacement' WHERE week_start = ?1`,
+		} {
+			if _, err := e.st.Writer.Exec(stmt, week.String()); err != nil {
+				t.Error(err)
+			}
+		}
+	}
+
+	g := e.generate(t)
+	wantJob(t, e.waitTitle(t, g), jobs.StatusFailed, shopping.ReasonTitleFailed)
+
+	var id string
+	if err := e.st.Reader.QueryRow(`SELECT id FROM shopping_lists WHERE week_start = ?`, week.String()).Scan(&id); err != nil {
+		t.Fatal(err)
+	}
+	if id != "replacement" || id == g.List.ID {
+		t.Fatalf("week's list = %s, want the replacement of %s", id, g.List.ID)
+	}
+	wantUntitled(t, "replacement's 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())
+	}
+}

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,0016_shopping_list_untitled,0017_shopping_list_chat_send_unconfirmed" {
-		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", 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,0019_shopping_group_frozen_name" {
+		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,0019_shopping_group_frozen_name", 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,0016_shopping_list_untitled,0017_shopping_list_chat_send_unconfirmed" {
-		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", 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,0019_shopping_group_frozen_name" {
+		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,0019_shopping_group_frozen_name", got)
 	}
 	if !tableExists(t, s, "dinners") {
 		t.Error("table from 0001_init was not created")
@@ -922,3 +922,57 @@ func TestMigrateShoppingListChatSendUnconfirmed(t *testing.T) {
 		t.Errorf("shopping list after 0017 = %s, want %s", got, want)
 	}
 }
+
+// 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)
+	}
+}

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/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.