FIX[BE]: if project flocs deleted kandangs reset to non_active and add filter get all project_flock by area,kandangs,period and location

internal/database/seed/seeder.go

@@ -378,6 +378,9 @@ func seedKandangs(tx *gorm.DB, createdBy uint, locations map[string]uint, users
 			if err := tx.Create(&kandang).Error; err != nil {
 				return nil, err
 			}
+			if err := syncPivotRelation(tx, projectFlockID, kandang.Id, createdBy); err != nil {
+				return nil, err
+			}
 		} else if err != nil {
 			return nil, err
 		} else {
@@ -394,6 +397,9 @@ func seedKandangs(tx *gorm.DB, createdBy uint, locations map[string]uint, users
 			if err := tx.Model(&entity.Kandang{}).Where("id = ?", kandang.Id).Updates(updates).Error; err != nil {
 				return nil, err
 			}
+			if err := syncPivotRelation(tx, projectFlockID, kandang.Id, createdBy); err != nil {
+				return nil, err
+			}
 		}
 		result[seed.Name] = kandang.Id
 	}
@@ -401,6 +407,40 @@ func seedKandangs(tx *gorm.DB, createdBy uint, locations map[string]uint, users
 	return result, nil
 }
 
+func syncPivotRelation(tx *gorm.DB, projectFlockID *uint, kandangID uint, createdBy uint) error {
+	if err := detachActivePivot(tx, kandangID); err != nil {
+		return err
+	}
+	if projectFlockID == nil {
+		return nil
+	}
+	return ensureActivePivot(tx, *projectFlockID, kandangID, createdBy)
+}
+
+func detachActivePivot(tx *gorm.DB, kandangID uint) error {
+	return tx.Model(&entity.ProjectFlockKandang{}).
+		Where("kandang_id = ? AND detached_at IS NULL", kandangID).
+		Updates(map[string]any{"detached_at": time.Now()}).Error
+}
+
+func ensureActivePivot(tx *gorm.DB, projectFlockID, kandangID, createdBy uint) error {
+	var pivot entity.ProjectFlockKandang
+	err := tx.Where("project_flock_id = ? AND kandang_id = ? AND detached_at IS NULL", projectFlockID, kandangID).
+		First(&pivot).Error
+	if err == nil {
+		return nil
+	}
+	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+		return err
+	}
+	newRecord := entity.ProjectFlockKandang{
+		ProjectFlockId: projectFlockID,
+		KandangId:      kandangID,
+		CreatedBy:      createdBy,
+	}
+	return tx.Create(&newRecord).Error
+}
+
 func seedWarehouses(tx *gorm.DB, createdBy uint, areas map[string]uint, locations map[string]uint, kandangs map[string]uint) error {
 	seeds := []struct {
 		Name     string