diff --git a/backend/src/main/java/com/petshop/backend/config/FlywayContextInitializer.java b/backend/src/main/java/com/petshop/backend/config/FlywayContextInitializer.java
index 0836a74f..9951c009 100644
--- a/backend/src/main/java/com/petshop/backend/config/FlywayContextInitializer.java
+++ b/backend/src/main/java/com/petshop/backend/config/FlywayContextInitializer.java
@@ -38,6 +38,7 @@ public class FlywayContextInitializer implements ApplicationContextInitializer<C
                         .dataSource(url, username, password)
                         .locations(locations)
                         .load();
+                flyway.repair();
                 flyway.migrate();
                 return;
             } catch (RuntimeException ex) {
diff --git a/backend/src/main/resources/db/migration/V5__seed_data_2026.sql b/backend/src/main/resources/db/migration/V5__seed_data_2026.sql
index 9405c93f..3f8f0a40 100644
--- a/backend/src/main/resources/db/migration/V5__seed_data_2026.sql
+++ b/backend/src/main/resources/db/migration/V5__seed_data_2026.sql
@@ -1,4 +1,4 @@
-INSERT INTO appointment (appointmentId, serviceId, petId, customerId, storeId, employeeId, appointmentDate, appointmentTime, appointmentStatus) VALUES
+INSERT IGNORE INTO appointment (appointmentId, serviceId, petId, customerId, storeId, employeeId, appointmentDate, appointmentTime, appointmentStatus) VALUES
 (91,  1, NULL, 16, 1,  3, '2026-03-08', '09:00:00', 'COMPLETED'),
 (92,  2, NULL, 17, 2,  8, '2026-03-10', '10:30:00', 'COMPLETED'),
 (93,  3, NULL, 18, 3, 13, '2026-03-12', '13:00:00', 'MISSED'),
@@ -21,7 +21,7 @@ INSERT INTO appointment (appointmentId, serviceId, petId, customerId, storeId, e
 (110, 4, NULL, 35, 2, 10, '2026-04-15', '10:00:00', 'SCHEDULED'),
 (111, 5, NULL, 36, 3, 11, '2026-04-16', '14:00:00', 'SCHEDULED');
 
-INSERT INTO sale (saleId, saleDate, totalAmount, paymentMethod, employeeId, storeId, customerId, isRefund, originalSaleId, channel, cartId, couponId, subtotalAmount, couponDiscountAmount, employeeDiscountAmount, pointsEarned) VALUES
+INSERT IGNORE INTO sale (saleId, saleDate, totalAmount, paymentMethod, employeeId, storeId, customerId, isRefund, originalSaleId, channel, cartId, couponId, subtotalAmount, couponDiscountAmount, employeeDiscountAmount, pointsEarned) VALUES
 (111, '2026-03-08 09:15:00', 87.50,  'Cash',  3, 1,  3, 0, NULL, 'IN_STORE', NULL, NULL, 87.50,  0.00, 0.00,  8),
 (112, '2026-03-09 10:22:00', 145.20, 'Card',  8, 2,  4, 0, NULL, 'IN_STORE', NULL, NULL, 145.20, 0.00, 0.00, 14),
 (113, '2026-03-10 11:33:00', 63.75,  'Cash', 13, 3,  5, 0, NULL, 'IN_STORE', NULL, NULL, 63.75,  0.00, 0.00,  6),
@@ -46,7 +46,7 @@ INSERT INTO sale (saleId, saleDate, totalAmount, paymentMethod, employeeId, stor
 (132, '2026-04-15 09:00:00', 145.30, 'Card',  4, 1, 24, 0, NULL, 'ONLINE',   NULL, NULL, 145.30, 0.00, 0.00, 14),
 (133, '2026-04-16 10:00:00', 78.60,  'Cash',  9, 2, 25, 0, NULL, 'IN_STORE', NULL, NULL, 78.60,  0.00, 0.00,  7);
 
-INSERT INTO saleItem (saleItemId, saleId, prodId, quantity, unitPrice) VALUES
+INSERT IGNORE INTO saleItem (saleItemId, saleId, prodId, quantity, unitPrice) VALUES
 (226, 111, 5,  2, 25.50),
 (227, 111, 18, 1, 36.50),
 (228, 112, 22, 3, 29.80),