feat: add batch-cooking sessions (single "mega recipe" with dish sections)

New AI-generated batch-cooking flow: pick N dinners/lunches + servings,
get one unified recipe covering a full prep session — merged shopping
list, steps tagged per-dish (a step can advance several dishes at once,
e.g. a shared oven bake), and per-dish storage (fridge/freezer) + exact
day-of reheat/finishing instructions.

Schema: recipes.isBatchCook, recipeSteps.appliesTo (dish names), new
recipeBatchDishes table. Batch recipes are excluded from the normal
/recipes list and live under their own /batch-cooking section.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/db/src/schema/recipes.ts

@@ -45,12 +45,14 @@ export const recipes = pgTable("recipes", {
   prepMins: integer("prep_mins"),
   cookMins: integer("cook_mins"),
   tags: text("tags").array().notNull().default([]),
+  isBatchCook: boolean("is_batch_cook").notNull().default(false),
   createdAt: timestamp("created_at").notNull().defaultNow(),
   updatedAt: timestamp("updated_at").notNull().defaultNow(),
 }, (t) => [
   index("recipes_author_idx").on(t.authorId),
   index("recipes_visibility_idx").on(t.visibility),
   index("recipes_dietary_tags_gin").using("gin", t.dietaryTags),
+  index("recipes_batch_cook_idx").on(t.isBatchCook),
 ]);
 
 export const ingredients = pgTable("ingredients", {
@@ -82,10 +84,25 @@ export const recipeSteps = pgTable("recipe_steps", {
   instruction: text("instruction").notNull(),
   timerSeconds: integer("timer_seconds"),
   photoUrl: text("photo_url"),
+  appliesTo: text("applies_to").array().notNull().default([]),
 }, (t) => [
   index("recipe_steps_recipe_idx").on(t.recipeId),
 ]);
 
+export const recipeBatchDishes = pgTable("recipe_batch_dishes", {
+  id: text("id").primaryKey(),
+  recipeId: text("recipe_id").notNull().references(() => recipes.id, { onDelete: "cascade" }),
+  name: text("name").notNull(),
+  description: text("description"),
+  order: integer("order").notNull().default(0),
+  fridgeDays: integer("fridge_days").notNull(),
+  freezerFriendly: boolean("freezer_friendly").notNull().default(false),
+  freezerNote: text("freezer_note"),
+  dayOfInstructions: text("day_of_instructions").notNull(),
+}, (t) => [
+  index("recipe_batch_dishes_recipe_idx").on(t.recipeId),
+]);
+
 export const recipePhotos = pgTable("recipe_photos", {
   id: text("id").primaryKey(),
   recipeId: text("recipe_id").notNull().references(() => recipes.id, { onDelete: "cascade" }),
@@ -128,6 +145,11 @@ export const recipesRelations = relations(recipes, ({ one, many }) => ({
   notes: many(recipeNotes),
   childVariations: many(recipeVariations, { relationName: "parent" }),
   parentVariations: many(recipeVariations, { relationName: "child" }),
+  batchDishes: many(recipeBatchDishes),
+}));
+
+export const recipeBatchDishesRelations = relations(recipeBatchDishes, ({ one }) => ({
+  recipe: one(recipes, { fields: [recipeBatchDishes.recipeId], references: [recipes.id] }),
 }));
 
 export const recipeIngredientsRelations = relations(recipeIngredients, ({ one }) => ({