feat(WHE-27): add drizzle db package and typed env config

packages/db/src/client.ts

@@ -0,0 +1,12 @@
+import postgres from 'postgres'
+import { drizzle } from 'drizzle-orm/postgres-js'
+
+import { env } from '@household/config'
+
+const queryClient = postgres(env.DATABASE_URL, {
+  prepare: false,
+  max: 5
+})
+
+export const db = drizzle(queryClient)
+export { queryClient }

packages/db/src/index.ts

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+export { db, queryClient } from './client'
+export * as schema from './schema'

packages/db/src/schema.ts

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+import { index, integer, pgTable, text, timestamp, uniqueIndex, uuid } from 'drizzle-orm/pg-core'
+
+export const households = pgTable('households', {
+  id: uuid('id').defaultRandom().primaryKey(),
+  name: text('name').notNull(),
+  createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull()
+})
+
+export const members = pgTable(
+  'members',
+  {
+    id: uuid('id').defaultRandom().primaryKey(),
+    householdId: uuid('household_id')
+      .notNull()
+      .references(() => households.id, { onDelete: 'cascade' }),
+    telegramUserId: text('telegram_user_id').notNull(),
+    displayName: text('display_name').notNull(),
+    isAdmin: integer('is_admin').default(0).notNull(),
+    joinedAt: timestamp('joined_at', { withTimezone: true }).defaultNow().notNull()
+  },
+  (table) => ({
+    householdIdx: index('members_household_idx').on(table.householdId),
+    householdTgUserUnique: uniqueIndex('members_household_tg_user_unique').on(
+      table.householdId,
+      table.telegramUserId
+    )
+  })
+)