- Add imageUtils.js helper with getImageSrc() and getGroupPreviewSrc()
- Update ImageGalleryCard to use preview images for galleries
- Update ModerationGroupsPage to show preview images in modal
- Update ModerationGroupImagesPage to use preview images
- Update PublicGroupImagesPage to pass all image fields
- SlideshowPage continues using original images (full quality)
- Update nginx.dev.conf with /api/previews and /api/download routes
- Update start-dev.sh to generate correct nginx config
- Fix GroupRepository.getAllGroupsWithModerationInfo() to return full image data
- Remove obsolete version from docker-compose.override.yml
- Update TODO.md: mark frontend cleanup as completed
Performance: Gallery load times reduced by ~96% (100KB vs 3MB per image)
Task 4: Upload Routes Extended
- upload.js: Generate preview after single file upload
- batchUpload.js: Generate previews for all batch uploads
- Async preview generation (non-blocking response)
- Auto-update preview_path in database after generation
Task 5: Repository with preview_path
- GroupRepository: Include preview_path in INSERT
- getGroupById: Return previewPath in image objects
- groupFormatter: Add previewPath to formatGroupDetail()
- All queries now support preview_path column
Task 6: API Endpoints Extended
- Add PREVIEW_STATIC_DIRECTORY constant (/previews)
- Serve preview images via express.static
- All existing endpoints now return previewPath field
- Fallback to filePath if preview not available (frontend)
- Install sharp@0.33.5 for image processing
- Create ImagePreviewService with preview generation
- Support 800px max width, JPEG 85% quality
- Automatic directory creation on first use
- Include preview size reduction logging
- Add cleanup method for orphaned previews
