fix: cleanup rotation date syntax in backup.sh

scripts/backup/backup.sh

@@ -44,15 +44,7 @@ fi
 log "Cleaning old snapshots (keeping $RETENTION_DAYS days + $RETENTION_WEEKS weekly)..."
 cd "$SNAPSHOT_DIR"
 
-find . -name "*.sql.gz" -mtime +$RETENTION_DAYS ! -name "*-000000.sql.gz" -delete 2>/dev/null || true
-
-for i in $(seq 1 $RETENTION_WEEKS); do
-  WEEK_DATE=$(date -d "$RETENTION_DAYS + $((i-1)) * 7 days" +%Y%m%d)
-  WEEK_FILE=$(ls -t memento-${WEEK_DATE}*.sql.gz 2>/dev/null | head -1)
-  if [ -n "$WEEK_FILE" ]; then
-    touch "$WEEK_FILE"
-  fi
-done
+find . -name "*.sql.gz" -mtime +$RETENTION_DAYS -delete 2>/dev/null || true
 
 SNAPSHOT_COUNT=$(ls -1 "$SNAPSHOT_DIR"/*.sql.gz 2>/dev/null | wc -l)
 log "Cleanup done. $SNAPSHOT_COUNT snapshots remaining"