feat: add core backend modules, inventory services, and patch scripts for AI Pharmacy API

scratch/cleanup_duplicates.ts

@@ -0,0 +1,25 @@
+import { pool } from '../src/db/pool';
+
+async function cleanupDuplicates() {
+  console.log('Cleaning up duplicate tenant batches...');
+
+  // 1. Delete stock movements referencing duplicate user batches
+  await pool.query(`
+    DELETE FROM stock_movements 
+    WHERE batch_no IN (
+      SELECT batch_no FROM batches WHERE batch_no LIKE '%-usr_%' OR tenant_id LIKE 'usr_%'
+    )
+  `);
+
+  // 2. Delete duplicate user batches
+  const res1 = await pool.query(`DELETE FROM batches WHERE batch_no LIKE '%-usr_%' OR tenant_id LIKE 'usr_%'`);
+  console.log('Deleted duplicate user batches count:', res1.rowCount);
+
+  // 3. Count remaining batches in DB
+  const countRes = await pool.query(`SELECT COUNT(*) FROM batches`);
+  console.log('Remaining total batches in DB:', countRes.rows[0].count);
+
+  await pool.end();
+}
+
+cleanupDuplicates().catch(console.error);