Add CLAUDE guidelines for consolidated pipeline

backend/src/db/migrate.ts

@@ -1,7 +1,15 @@
 import { Pool } from 'pg';
 
+// Consolidated DB connection:
+// - Prefer CRAWLSY_DATABASE_URL (e.g., crawlsy_local, crawlsy_prod)
+// - Then DATABASE_URL (default)
+const DATABASE_URL =
+  process.env.CRAWLSY_DATABASE_URL ||
+  process.env.DATABASE_URL ||
+  'postgresql://dutchie:dutchie_local_pass@localhost:54320/crawlsy_local';
+
 const pool = new Pool({
-  connectionString: process.env.DATABASE_URL,
+  connectionString: DATABASE_URL,
 });
 
 export async function runMigrations() {