Update snapshot list to sync with remote

- Added syncWithRemote method that lists remote snapshots from S3
- Removes local snapshots that don't exist in remote storage
- Ensures local database stays in sync with actual remote state
- This prevents showing snapshots that have been deleted from S3

internal/cli/snapshot.go

@@ -487,6 +487,12 @@ func newSnapshotVerifyCommand() *cobra.Command {
 
 // List lists all snapshots
 func (app *SnapshotApp) List(ctx context.Context, jsonOutput bool) error {
+	// First, sync with remote snapshots
+	if err := app.syncWithRemote(ctx); err != nil {
+		return fmt.Errorf("syncing with remote: %w", err)
+	}
+
+	// Now get snapshots from S3
 	snapshots, err := app.getSnapshots(ctx)
 	if err != nil {
 		return err
@@ -774,6 +780,54 @@ func (app *SnapshotApp) deleteSnapshot(ctx context.Context, snapshotID string) e
 	return nil
 }
 
+// syncWithRemote syncs local database with remote snapshots
+func (app *SnapshotApp) syncWithRemote(ctx context.Context) error {
+	log.Info("Syncing with remote snapshots")
+
+	// Get all remote snapshot IDs
+	remoteSnapshots := make(map[string]bool)
+	objectCh := app.S3Client.ListObjectsStream(ctx, "metadata/", false)
+
+	for object := range objectCh {
+		if object.Err != nil {
+			return fmt.Errorf("listing remote snapshots: %w", object.Err)
+		}
+
+		// Extract snapshot ID from paths like metadata/hostname-20240115-143052Z/
+		parts := strings.Split(object.Key, "/")
+		if len(parts) >= 2 && parts[0] == "metadata" && parts[1] != "" {
+			remoteSnapshots[parts[1]] = true
+		}
+	}
+
+	log.Debug("Found remote snapshots", "count", len(remoteSnapshots))
+
+	// Get all local snapshots (use a high limit to get all)
+	localSnapshots, err := app.Repositories.Snapshots.ListRecent(ctx, 10000)
+	if err != nil {
+		return fmt.Errorf("listing local snapshots: %w", err)
+	}
+
+	// Remove local snapshots that don't exist remotely
+	removedCount := 0
+	for _, snapshot := range localSnapshots {
+		if !remoteSnapshots[snapshot.ID] {
+			log.Info("Removing local snapshot not found in remote", "snapshot_id", snapshot.ID)
+			if err := app.Repositories.Snapshots.Delete(ctx, snapshot.ID); err != nil {
+				log.Error("Failed to delete local snapshot", "snapshot_id", snapshot.ID, "error", err)
+			} else {
+				removedCount++
+			}
+		}
+	}
+
+	if removedCount > 0 {
+		log.Info("Removed local snapshots not found in remote", "count", removedCount)
+	}
+
+	return nil
+}
+
 // parseSnapshotTimestamp extracts timestamp from snapshot ID
 // Format: hostname-20240115-143052Z
 func parseSnapshotTimestamp(snapshotID string) (time.Time, error) {