attempt to fix too many db connection using global db client instance

frontend/src/lib/db/index.ts

@@ -1,7 +1,19 @@
-import { drizzle } from 'drizzle-orm/postgres-js'
+import {
+	drizzle,
+	type PostgresJsDatabase,
+} from 'drizzle-orm/postgres-js'
 import postgres from 'postgres'
 import * as schema from './schema'
 import { env } from '$env/dynamic/private'
 
-const client = postgres(env.DATABASE_URL)
-export const db = drizzle(client, { schema })
+declare global {
+	var db: PostgresJsDatabase<typeof schema> | undefined
+}
+
+let db: PostgresJsDatabase<typeof schema>
+if (!global.db) {
+	global.db = drizzle(postgres(env.DATABASE_URL), { schema })
+}
+db = global.db
+
+export { db }