feat(db): add database connection setup using drizzle-orm for PostgreSQL

packages/server/src/db/index.ts

@@ -0,0 +1,21 @@
+import { drizzle, type PostgresJsDatabase } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+import * as schema from "./schema";
+
+declare global {
+	var db: PostgresJsDatabase<typeof schema> | undefined;
+}
+
+export let db: PostgresJsDatabase<typeof schema>;
+if (process.env.NODE_ENV === "production") {
+	db = drizzle(postgres(process.env.DATABASE_URL!), {
+		schema,
+	});
+} else {
+	if (!global.db)
+		global.db = drizzle(postgres(process.env.DATABASE_URL!), {
+			schema,
+		});
+
+	db = global.db;
+}