fix: improve env onboarding and dev error messages

packages/db/index.ts

@@ -1,6 +1,12 @@
 import { drizzle } from 'drizzle-orm/neon-http';
 import * as schema from './schema.ts';
 
-export const db = drizzle(process.env.DATABASE_URL!, { schema });
+const databaseUrl = process.env.DATABSE_URL;
 
-export * from './schema.ts';
+if(!databaseUrl) {
+    throw new Error{
+        "DTABASE_URL is missing. Create the required env file (see .env.example) and set DATABASE_URL"
+    };
+}
+
+export const db = drizzle(databaseUrl, { schema });