diff --git a/backend/db.js b/backend/db.js
index cdaddca..65ddbdf 100644
--- a/backend/db.js
+++ b/backend/db.js
@@ -484,6 +484,11 @@ const initDB = async () => {
             );
         `);
 
+        await pool.query(`
+            ALTER TABLE cut_plan_lot_reservations
+            ADD COLUMN IF NOT EXISTS production_plan_id INTEGER REFERENCES production_plans(id) ON DELETE SET NULL;
+        `).catch(() => {});
+
         await pool.query(`CREATE INDEX IF NOT EXISTS idx_cut_plan_lot_reservations_lot_status ON cut_plan_lot_reservations (supply_lot_id, status);`);
         await pool.query(`CREATE INDEX IF NOT EXISTS idx_cut_plan_lot_reservations_reference ON cut_plan_lot_reservations (cut_plan_reference, status);`);
         await pool.query(`CREATE INDEX IF NOT EXISTS idx_cut_plan_lot_reservations_plan ON cut_plan_lot_reservations (production_plan_id, status);`);