replace tape library body layout

backend/internal/storage/zfs.go

@@ -391,7 +391,8 @@ func (s *ZFSService) ListPools(ctx context.Context) ([]*ZFSPool, error) {
 			&pool.CreatedAt, &pool.UpdatedAt, &pool.CreatedBy,
 		)
 		if err != nil {
-			return nil, fmt.Errorf("failed to scan pool: %w", err)
+			s.logger.Error("Failed to scan pool row", "error", err)
+			continue // Skip this pool instead of failing entire query
 		}
 		if description.Valid {
 			pool.Description = description.String
@@ -407,8 +408,14 @@ func (s *ZFSService) ListPools(ctx context.Context) ([]*ZFSPool, error) {
 		}
 
 		pools = append(pools, &pool)
+		s.logger.Debug("Added pool to list", "pool_id", pool.ID, "name", pool.Name)
 	}
 
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("error iterating pool rows: %w", err)
+	}
+
+	s.logger.Debug("Listed ZFS pools", "count", len(pools))
 	return pools, nil
 }
 
@@ -460,11 +467,22 @@ func (s *ZFSService) DeletePool(ctx context.Context, poolID string) error {
 		return err
 	}
 
-	// Destroy ZFS pool
-	cmd := exec.CommandContext(ctx, "zpool", "destroy", pool.Name)
+	// Destroy ZFS pool with -f flag to force destroy (works for both empty and non-empty pools)
+	// The -f flag is needed to destroy pools even if they have datasets or are in use
+	s.logger.Info("Destroying ZFS pool", "pool", pool.Name)
+	cmd := exec.CommandContext(ctx, "zpool", "destroy", "-f", pool.Name)
 	output, err := cmd.CombinedOutput()
 	if err != nil {
-		return fmt.Errorf("failed to destroy ZFS pool: %s: %w", string(output), err)
+		errorMsg := string(output)
+		// Check if pool doesn't exist (might have been destroyed already)
+		if strings.Contains(errorMsg, "no such pool") || strings.Contains(errorMsg, "cannot open") {
+			s.logger.Warn("Pool does not exist in ZFS, continuing with database cleanup", "pool", pool.Name)
+			// Continue with database cleanup even if pool doesn't exist
+		} else {
+			return fmt.Errorf("failed to destroy ZFS pool: %s: %w", errorMsg, err)
+		}
+	} else {
+		s.logger.Info("ZFS pool destroyed successfully", "pool", pool.Name)
 	}
 
 	// Mark disks as unused