feat(db): 新增 portfolio_snapshots 表与每日快照记录 Action

src/db/schema.ts

@@ -1,4 +1,4 @@
-import { pgTable, uuid, varchar, timestamp, pgEnum, numeric, uniqueIndex } from "drizzle-orm/pg-core";
+import { pgTable, uuid, varchar, timestamp, pgEnum, numeric, uniqueIndex, date } from "drizzle-orm/pg-core";
 
 export const users = pgTable("users", {
   id: uuid("id").primaryKey().$defaultFn(() => crypto.randomUUID()),
@@ -65,3 +65,16 @@ export const exchangeRates = pgTable("exchange_rates", {
 }, (table) => [
   uniqueIndex("currency_pair_idx").on(table.fromCurrency, table.toCurrency),
 ]);
+
+export const portfolioSnapshots = pgTable("portfolio_snapshots", {
+  id: uuid("id").primaryKey().$defaultFn(() => crypto.randomUUID()),
+  date: date("date", { mode: "string" }).notNull().unique(),
+  totalValueCny: numeric("total_value_cny", { precision: 36, scale: 18 }).notNull(),
+  totalCostCny: numeric("total_cost_cny", { precision: 36, scale: 18 }).notNull(),
+  createdAt: timestamp("created_at", { withTimezone: true, mode: "date" })
+    .defaultNow()
+    .notNull(),
+  updatedAt: timestamp("updated_at", { withTimezone: true, mode: "date" })
+    .defaultNow()
+    .notNull(),
+});