Add session changelog

CHANGELOG_SESSION.md

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+# Session Changelog - January 1, 2026
+
+## Production Setup Session
+
+### What Was Done
+
+1. **Backend Setup**
+   - Copied working `server.ts` from Job-Info-Test
+   - Added `redis-cache.ts` for Valkey/Redis caching
+   - Fixed static file path to serve from `frontend/public`
+   - Fast job loading: returns first 40 jobs instantly, then full list on poll
+
+2. **Frontend Setup**
+   - Copied working frontend from Job-Info-Test to `frontend/public/`
+   - Simplified token validation at startup:
+     - Check PocketBase session valid
+     - Check Graph token in localStorage
+     - If either missing → redirect to signin
+   - Removed redundant token refresh loops
+   - Added localStorage storage for Graph token in signin.html
+
+3. **Authentication Flow**
+   - PocketBase OAuth with Microsoft provider
+   - Graph token stored in localStorage after signin
+   - Both tokens checked once at page load
+   - No repeated token validation during app usage
+
+4. **Systemd Service**
+   - Created `/etc/systemd/system/job-info-prod.service`
+   - Runs on port 3005
+   - Auto-restarts on failure
+
+5. **Git Repository**
+   - Initialized and pushed to: https://gitea.ccllc.pro/Cardoza_Construction/Job-Info-Prod.git
+   - Branch: main
+
+### Key Files
+
+| File | Purpose |
+|------|---------|
+| `backend/src/index.ts` | Main Hono server with all endpoints |
+| `backend/src/redis-cache.ts` | Redis/Valkey cache helpers |
+| `frontend/public/index.html` | Main app UI |
+| `frontend/public/signin.html` | OAuth signin page (purple styling) |
+| `frontend/public/auth.js` | PocketBase auth bootstrap |
+
+### Endpoints
+
+- `GET /` - Serve frontend
+- `GET /version` - App version
+- `GET /api/health` - Health check
+- `GET /api/jobs-all` - All jobs (first 40 fast, then full)
+- `GET /api/jobs` - Paginated jobs
+- `GET /api/job-files` - SharePoint files via Graph API
+- `GET /api/job-file-content` - File content/download
+- `GET /api/job-file-pdf` - PDF proxy
+- `POST /log-change` - Log changes
+
+### Configuration
+
+- Port: 3005
+- PocketBase: https://pocketbase.ccllc.pro
+- Collection: pbc_1407612689
+- Redis/Valkey: localhost:6379
+
+### Known Limitations
+
+- Graph tokens expire after ~60 minutes (Microsoft limitation)
+- No automatic Graph token refresh (would require direct OAuth flow)
+- User must re-signin when Graph token expires
+
+### Next Steps
+
+- Consider implementing direct Microsoft OAuth for refresh token support
+- Add error boundaries for better UX on token expiry
+- Performance monitoring