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Task_Reporter/openspec/changes/archive/2025-12-08-improve-file-display-and-timezone/proposal.md
egg 44822a561a feat: Improve file display, timezone handling, and LOT management 
Changes:
- Fix datetime serialization with UTC 'Z' suffix for correct timezone display
- Add PDF upload support with extension fallback for MIME detection
- Fix LOT add/remove by creating new list for SQLAlchemy JSON change detection
- Add file message components (FileMessage, ImageLightbox, UploadPreview)
- Add multi-file upload support with progress tracking
- Link uploaded files to chat messages via message_id
- Include file attachments in AI report generation
- Update specs for file-storage, realtime-messaging, and ai-report-generation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-12-08 12:39:15 +08:00

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Change: Improve File Display in Chat and Fix Timezone Issues

Why

Currently, uploaded files and images only appear in the "file drawer" sidebar, making it difficult to understand the context of when and why a file was uploaded. This also impacts AI report generation, as the AI cannot associate files with the conversation context. Additionally, some parts of the application still display times in GMT+0 instead of GMT+8.

What Changes

  • BREAKING: Message creation when uploading files - files now generate a linked message in chat
  • Display uploaded files and images inline in the chat conversation
  • Add image preview functionality with lightbox
  • Show image thumbnails in chat messages (expandable to full size)
  • Non-image files display with file type icons
  • Update upload interface to show preview before sending
  • Update AI report data collection to include file context (associated messages)
  • Fix remaining GMT+0 timestamp displays to use GMT+8

Impact

  • Affected specs: file-storage, realtime-messaging, ai-report-generation
  • Affected code:
    • Backend: app/modules/file_storage/router.py, app/modules/realtime/ (message creation on upload)
    • Backend: app/modules/report_generation/services/report_data_service.py
    • Frontend: frontend/src/pages/RoomDetail.tsx
    • Frontend: New components FileMessage.tsx, ImagePreview.tsx
    • Database: May need migration to add message_id FK to tr_room_files