groceries: stats page with nightly snapshot (battles, basket, promos, CPI, range)

src/lib/server/db/schema/groceries.ts

@@ -6,6 +6,7 @@ import {
 	date,
 	index,
 	integer,
+	jsonb,
 	numeric,
 	real,
 	text,
@@ -277,6 +278,51 @@ export const grocerySynonyms = groceriesSchema.table(
 	]
 );
 
+/**
+ * Nightly analytics for /trackers/groceries/stats (computeStats in
+ * src/lib/server/groceries/stats.ts, run after import + regroup + taxonomy under the import lock).
+ * One row per day per scope ('food' = edible only, 'all' = incl. drugstore/household). `data` holds
+ * the overall section plus one per top category; `series` (daily chained price index) is only kept
+ * on recent rows, older rows are pruned to the overall section so history stays small.
+ */
+export const groceryStatsSnapshots = groceriesSchema.table(
+	'stats_snapshots',
+	{
+		id: id(),
+		computedOn: date('computed_on').notNull(),
+		scope: text('scope').notNull(),
+		computedAt: timestamptz('computed_at').notNull().defaultNow(),
+		durationMs: integer('duration_ms'),
+		data: jsonb('data').notNull(),
+		series: jsonb('series')
+	},
+	(t) => [
+		uniqueIndex('stats_snapshots_day_scope_key').on(t.computedOn, t.scope),
+		check('stats_snapshots_scope_check', sql`${t.scope} IN ('food','all')`)
+	]
+);
+
+/**
+ * Pack size history (a row only when an item's size changes), written by computeStats so
+ * shrinkflation (smaller pack, same or higher price) can be detected. item_prices has no sizes.
+ */
+export const groceryItemSizes = groceriesSchema.table(
+	'item_sizes',
+	{
+		id: id(),
+		itemId: integer('item_id')
+			.notNull()
+			.references(() => groceryItems.id, { onDelete: 'cascade' }),
+		observedOn: date('observed_on').notNull(),
+		unit: text('unit').$type<GroceryUnit>(),
+		unitAmount: numeric('unit_amount', { precision: 12, scale: 4, mode: 'number' }),
+		sizeText: text('size_text'),
+		priceCents: integer('price_cents'),
+		createdAt: timestamptz('created_at').notNull().defaultNow()
+	},
+	(t) => [uniqueIndex('item_sizes_item_day_key').on(t.itemId, t.observedOn)]
+);
+
 export type GroceryStore = typeof groceryStores.$inferSelect;
 export type GroceryGroup = typeof groceryGroups.$inferSelect;
 export type GroceryItem = typeof groceryItems.$inferSelect;