added filtering and cronjob soft delete for old events

backend/repositories/EventRepository.go

@@ -19,6 +19,7 @@ import (
 type EventRepository interface {
 	Save(event *models.Event) error
 	FindAll() ([]models.Event, error)
+	SoftDeleteEndedBefore(cutoffDate string) (int64, error)
 }
 
 type eventRepository struct {
@@ -101,6 +102,18 @@ func (r *eventRepository) FindAll() ([]models.Event, error) {
 	return events, result.Error
 }
 
+// SoftDeleteEndedBefore marks events whose end_date is before cutoffDate
+// (an exclusive "YYYY-MM-DD" boundary, the same lexicographic string
+// comparison the frontend uses for its own date filtering) as deleted.
+// .Delete() on a gorm.Model sets deleted_at rather than removing the row,
+// consistent with how the frontend already treats soft-deleted events.
+// Events with a blank end_date are left alone — there's nothing to
+// compare, so leaving them is safer than guessing they're stale.
+func (r *eventRepository) SoftDeleteEndedBefore(cutoffDate string) (int64, error) {
+	result := r.db.Where("end_date <> '' AND end_date < ?", cutoffDate).Delete(&models.Event{})
+	return result.RowsAffected, result.Error
+}
+
 func (r *eventRepository) saveMediaFile(filename string, url string, mediaType string, extension string) error {
 	mediaFilePath := fmt.Sprintf("./public/storage/%s/%s%s", strings.ToLower(mediaType), filename, extension)
 

backend/services/EventService.go

@@ -2,11 +2,18 @@ package services
 
 import (
 	"log"
+	"time"
 	"whimsoc/vindn-backend/models"
 	"whimsoc/vindn-backend/repositories"
 	"whimsoc/vindn-backend/utils"
 )
 
+// Events older than this are pure housekeeping — the frontend's display
+// queries already hide anything past its own end_date immediately, so this
+// buffer is just how long a soft-deleted event's detail page (e.g. a
+// bookmarked or shared link) keeps resolving before it's cleaned up too.
+const cleanupAfterDays = 90
+
 func FetchEvents() ([]models.Event, error) {
 	return utils.FetchDataFromAPI()
 }
@@ -36,3 +43,19 @@ func (s *EventService) ImportEvents() error {
 
 	return nil
 }
+
+// CleanupOldEvents soft-deletes events that ended more than
+// cleanupAfterDays ago, so the events table doesn't grow forever — the ODH
+// import only ever upserts and never removes rows on its own.
+func (s *EventService) CleanupOldEvents() error {
+	cutoff := time.Now().AddDate(0, 0, -cleanupAfterDays).Format("2006-01-02")
+
+	affected, err := s.repo.SoftDeleteEndedBefore(cutoff)
+	if err != nil {
+		return err
+	}
+
+	log.Printf("Cleanup: soft-deleted %d event(s) that ended before %s", affected, cutoff)
+
+	return nil
+}

backend/tasks/Cronjob.go

@@ -18,5 +18,13 @@ func StartCronJobs(eventService *services.EventService) {
 		}
 	})
 
+	// Einmal täglich um 03:00 Uhr, außerhalb der Import-Zeiten
+	c.AddFunc("0 3 * * *", func() {
+		log.Println("Starte geplante Bereinigung alter Events...")
+		if err := eventService.CleanupOldEvents(); err != nil {
+			log.Printf("Fehler bei der Bereinigung: %v", err)
+		}
+	})
+
 	c.Start()
 }