Refactor patch test system and add booking edit requests

- Replace patch_test_duration_hours on services with separate
  patch_tests table
- Add user_patch_tests table to track user patch test records
- Add booking edit request system: users can request time changes
- Add admin handlers to list, approve, and reject edit requests
- Add validation to prevent editing completed/cancelled bookings
- Add overlap and closed-day checks for booking edits

backend/testutils/fixtures/fixtures.go

@@ -57,10 +57,10 @@ func CreateTestService(pool *pgxpool.Pool) (string, error) {
 	ctx := context.Background()
 	var serviceID string
 	err := pool.QueryRow(ctx, `
-		INSERT INTO services (name, description, price, duration_minutes, is_active, patch_test_duration_hours, minimum_age_required)
-		VALUES ($1, $2, $3, $4, $5, $6, $7)
+		INSERT INTO services (name, description, price, duration_minutes, is_active, minimum_age_required)
+		VALUES ($1, $2, $3, $4, $5, $6)
 		RETURNING id
-	`, "Test Service", "A test service for unit tests", 50.00, 60, true, 0, 16).Scan(&serviceID)
+	`, "Test Service", "A test service for unit tests", 50.00, 60, true, 16).Scan(&serviceID)
 
 	if err != nil {
 		return "", fmt.Errorf("failed to create service: %w", err)
@@ -69,20 +69,68 @@ func CreateTestService(pool *pgxpool.Pool) (string, error) {
 	return serviceID, nil
 }
 
-func CreateTestServiceWithPatchTest(pool *pgxpool.Pool) (string, error) {
+// CreateTestServiceWithPatchTest creates a service and a patch test that links to it
+// Returns serviceID, patchTestID
+func CreateTestServiceWithPatchTest(pool *pgxpool.Pool) (string, string, error) {
 	ctx := context.Background()
+
+	// First create the service
 	var serviceID string
 	err := pool.QueryRow(ctx, `
-		INSERT INTO services (name, description, price, duration_minutes, is_active, patch_test_duration_hours, minimum_age_required)
-		VALUES ($1, $2, $3, $4, $5, $6, $7)
+		INSERT INTO services (name, description, price, duration_minutes, is_active, minimum_age_required)
+		VALUES ($1, $2, $3, $4, $5, $6)
 		RETURNING id
-	`, "Test Patch Test Service", "A test service requiring patch test", 75.00, 90, true, 48, 18).Scan(&serviceID)
+	`, "Test Patch Test Service", "A test service requiring patch test", 75.00, 90, true, 18).Scan(&serviceID)
 
 	if err != nil {
-		return "", fmt.Errorf("failed to create service: %w", err)
+		return "", "", fmt.Errorf("failed to create service: %w", err)
 	}
 
-	return serviceID, nil
+	// Now create a patch test that links to this service
+	var patchTestID string
+	err = pool.QueryRow(ctx, `
+		INSERT INTO patch_tests (name, description, notice_duration_hours, expiry_months, service_ids)
+		VALUES ($1, $2, $3, $4, $5)
+		RETURNING id
+	`, "Test Patch Test", "A patch test for testing", 24, 6, []string{serviceID}).Scan(&patchTestID)
+
+	if err != nil {
+		return "", "", fmt.Errorf("failed to create patch test: %w", err)
+	}
+
+	return serviceID, patchTestID, nil
+}
+
+// CreateTestPatchTest creates a patch test definition
+func CreateTestPatchTest(pool *pgxpool.Pool, serviceIDs []string) (string, error) {
+	ctx := context.Background()
+	var patchTestID string
+	err := pool.QueryRow(ctx, `
+		INSERT INTO patch_tests (name, description, notice_duration_hours, expiry_months, service_ids)
+		VALUES ($1, $2, $3, $4, $5)
+		RETURNING id
+	`, "Test Patch Test", "A patch test for testing", 24, 6, serviceIDs).Scan(&patchTestID)
+
+	if err != nil {
+		return "", fmt.Errorf("failed to create patch test: %w", err)
+	}
+
+	return patchTestID, nil
+}
+
+// CreateUserPatchTest creates a user patch test record
+func CreateUserPatchTest(pool *pgxpool.Pool, userID, patchTestID string, testedAt string) error {
+	ctx := context.Background()
+	_, err := pool.Exec(ctx, `
+		INSERT INTO user_patch_tests (user_id, patch_test_id, tested_at)
+		VALUES ($1, $2, $3)
+	`, userID, patchTestID, testedAt)
+
+	if err != nil {
+		return fmt.Errorf("failed to create user patch test: %w", err)
+	}
+
+	return nil
 }
 
 func CreateTestBooking(pool *pgxpool.Pool, userID, serviceID string) (string, error) {

backend/testutils/testdb/testdb.go

@@ -76,7 +76,9 @@ func Migrate(t *testing.T, pool *pgxpool.Pool) {
 			"booking_services",
 			"payments",
 			"bookings",
-			"user_service_patch_tests",
+			"user_patch_tests",
+			"patch_tests",
+			"booking_edit_requests",
 			"services",
 			"verification_codes",
 			"user_social_logins",
@@ -196,7 +198,8 @@ func TruncateTables(t *testing.T, pool *pgxpool.Pool) {
 		"booking_services",
 		"payments",
 		"bookings",
-		"user_service_patch_tests",
+		"user_patch_tests",
+		"patch_tests",
 		"services",
 		"admin_notifications",
 		"user_referrals",