diff --git a/database/migrations/Migration20260218114512_orderCalc.ts b/database/migrations/Migration20260218114512_orderCalc.ts
new file mode 100644
index 0000000..a7abef7
--- /dev/null
+++ b/database/migrations/Migration20260218114512_orderCalc.ts
@@ -0,0 +1,44 @@
+import { Migration } from '@mikro-orm/migrations';
+
+export class Migration20260218114512_orderCalc extends Migration {
+
+  override async up(): Promise<void> {
+    this.addSql(`
+      CREATE OR REPLACE FUNCTION update_order_paid_amount()
+      RETURNS TRIGGER AS $$
+      BEGIN
+        UPDATE orders o
+        SET paid_amount = (
+          SELECT COALESCE(SUM(p.amount), 0)
+          FROM payments p
+          WHERE p.order_id = COALESCE(NEW.order_id, OLD.order_id)
+            AND p.status = 'Paid'
+        )
+        WHERE o.id = COALESCE(NEW.order_id, OLD.order_id);
+
+        RETURN NULL;
+      END;
+      $$ LANGUAGE plpgsql;
+    `);
+
+    this.addSql(`
+      CREATE TRIGGER trg_update_order_paid_amount
+      AFTER INSERT OR UPDATE OR DELETE
+      ON payments
+      FOR EACH ROW
+      EXECUTE FUNCTION update_order_paid_amount();
+    `);
+
+    this.addSql(`
+      CREATE INDEX idx_payments_order_status
+      ON payments(order_id, status);
+    `);
+  }
+
+  override async down(): Promise<void> {
+    this.addSql(`DROP TRIGGER IF EXISTS trg_update_order_paid_amount ON payments;`);
+    this.addSql(`DROP FUNCTION IF EXISTS update_order_paid_amount;`);
+    this.addSql(`DROP INDEX IF EXISTS idx_payments_order_status;`);
+  }
+
+}
diff --git a/package.json b/package.json
index 9143673..4e1920d 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
     "test:e2e": "jest --config ./test/jest-e2e.json",
     "migration:create": "npx mikro-orm migration:create --config ./src/config/mikro-orm.config.dev.ts",
+    "migration:blank": "npx mikro-orm migration:create --blank --config ./src/config/mikro-orm.config.dev.ts",
     "migration:up": "npx mikro-orm migration:up --config ./src/config/mikro-orm.config.dev.ts",
     "migration:down": "npx mikro-orm migration:down --config ./src/config/mikro-orm.config.dev.ts",
     "migration:list": "npx mikro-orm migration:list --config ./src/config/mikro-orm.config.dev.ts",