Refactor database structure: remove deprecated files and introduce new schema definitions for users, articles, and related entities.

Author: kingRayhan

src/backend/database.ts

@@ -0,0 +1,4 @@
+import "dotenv/config";
+import { drizzle } from "drizzle-orm/node-postgres";
+import * as schema from "../schemas/schemas";
+export const db = drizzle(process.env.DATABASE_URL!, { schema });