Refactor Docker and Makefile configurations for improved build processes

- Updated docker-compose.tools.yml to mount source code at /src and set working directory for backend tools, ensuring proper Go module caching.
- Modified Dockerfile.tools to install the latest golangci-lint version compatible with Go 1.24 and adjusted working directory for build-time operations.
- Enhanced Makefile to build backend tools before running tests and linting, ensuring dependencies are up-to-date and improving overall workflow efficiency.
- Refactored test and handler files to include error handling for database operations, enhancing reliability and debugging capabilities.

internal/app/services/export.go

@@ -111,7 +111,7 @@ func (s *ExportService) Export(ctx context.Context, w io.Writer) error {
 		if markersb != nil {
 			markersgrid := markersb.Bucket(store.BucketMarkersGrid)
 			if markersgrid != nil {
-				markersgrid.ForEach(func(k, v []byte) error {
+				if err := markersgrid.ForEach(func(k, v []byte) error {
 					select {
 					case <-ctx.Done():
 						return ctx.Err()
@@ -125,7 +125,9 @@ func (s *ExportService) Export(ctx context.Context, w io.Writer) error {
 						maps[gridMap[marker.GridID]].Markers[marker.GridID] = append(maps[gridMap[marker.GridID]].Markers[marker.GridID], marker)
 					}
 					return nil
-				})
+				}); err != nil {
+					return err
+				}
 			}
 		}
 		return nil
@@ -218,7 +220,11 @@ func (s *ExportService) Merge(ctx context.Context, zr *zip.Reader) error {
 					f.Close()
 					return err
 				}
-				io.Copy(f, r)
+				if _, err := io.Copy(f, r); err != nil {
+					r.Close()
+					f.Close()
+					return err
+				}
 				r.Close()
 				f.Close()
 				newTiles[strings.TrimSuffix(filepath.Base(fhdr.Name), ".png")] = struct{}{}
@@ -290,8 +296,12 @@ func (s *ExportService) processMergeJSON(
 				Image:    img,
 			}
 			raw, _ := json.Marshal(m)
-			mgrid.Put(key, raw)
-			idB.Put(idKey, key)
+			if err := mgrid.Put(key, raw); err != nil {
+				return err
+			}
+			if err := idB.Put(idKey, key); err != nil {
+				return err
+			}
 		}
 	}
 
@@ -333,7 +343,9 @@ func (s *ExportService) processMergeJSON(
 			if err != nil {
 				return err
 			}
-			grids.Put([]byte(grid), raw)
+			if err := grids.Put([]byte(grid), raw); err != nil {
+				return err
+			}
 		}
 		return nil
 	}
@@ -372,11 +384,13 @@ func (s *ExportService) processMergeJSON(
 		if err != nil {
 			return err
 		}
-		grids.Put([]byte(grid), raw)
+		if err := grids.Put([]byte(grid), raw); err != nil {
+			return err
+		}
 	}
 
 	if len(existingMaps) > 1 {
-		grids.ForEach(func(k, v []byte) error {
+		if err := grids.ForEach(func(k, v []byte) error {
 			gd := app.GridData{}
 			if err := json.Unmarshal(v, &gd); err != nil {
 				return err
@@ -413,16 +427,22 @@ func (s *ExportService) processMergeJSON(
 						File:  td.File,
 					})
 				}
-				grids.Put(k, raw)
+				if err := grids.Put(k, raw); err != nil {
+					return err
+				}
 			}
 			return nil
-		})
+		}); err != nil {
+			return err
+		}
 	}
 	for mergeid, merge := range existingMaps {
 		if mapid == mergeid {
 			continue
 		}
-		mapB.Delete([]byte(strconv.Itoa(mergeid)))
+		if err := mapB.Delete([]byte(strconv.Itoa(mergeid))); err != nil {
+			return err
+		}
 		slog.Info("reporting merge", "from", mergeid, "to", mapid)
 		s.mapSvc.ReportMerge(mergeid, mapid, app.Coord{X: offset.X - merge.X, Y: offset.Y - merge.Y})
 	}