Merge db-migrations: Add Flask-Migrate support and clean up old migration system

MIGRATION_SETUP_FINAL.md

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+# Final Migration Setup for TimeTrack
+
+## What's Working Now
+
+Your migration system is now fully functional with:
+
+1. **Flask-Migrate** - Handles database schema changes
+2. **Automatic Enum Sync** - Handles PostgreSQL enum values
+3. **Docker Support** - Works without Git in containers
+
+## Essential Files to Keep
+
+### Core Migration Files
+- `migrations/` - Flask-Migrate directory (required)
+- `sync_postgres_enums.py` - Auto-syncs enum values on startup
+- `docker_migrate_init.py` - Initializes migrations in Docker
+
+### Updated Startup Scripts
+- `startup_postgres.sh` - Now includes enum sync
+- `startup_postgres_safe.sh` - Debug version with error handling
+- `startup.sh` - Updated for Flask-Migrate
+
+### Debug Tools (Optional)
+- `debug_entrypoint.sh` - For troubleshooting
+- `docker-compose.debug.yml` - Debug Docker setup
+
+### Documentation
+- `FLASK_MIGRATE_GUIDE.md` - Complete guide
+- `DOCKER_MIGRATIONS_GUIDE.md` - Docker-specific guide
+- `POSTGRES_ENUM_GUIDE.md` - Enum handling guide
+- `FLASK_MIGRATE_TROUBLESHOOTING.md` - Troubleshooting guide
+
+## Workflow Summary
+
+### For New Schema Changes
+```bash
+# 1. Modify your models
+# 2. Generate migration
+flask db migrate -m "Add new feature"
+# 3. Review the generated file
+# 4. Apply migration
+flask db upgrade
+```
+
+### For New Enum Values
+```python
+# Just add to Python enum - sync happens automatically
+class TaskStatus(enum.Enum):
+    NEW_STATUS = "New Status"
+```
+
+### Docker Deployment
+```bash
+# Everything is automatic in startup scripts:
+# 1. Migrations applied
+# 2. Enums synced
+# 3. App starts
+```
+
+## Cleanup
+
+Run the cleanup script to remove all temporary files:
+```bash
+./cleanup_migration_cruft.sh
+```
+
+This removes ~20+ temporary scripts while keeping the essential ones.
+
+## Notes
+
+- The old migration system (`migrations_old/`) can be removed after confirming everything works
+- PostgreSQL enums now support both names (TODO) and values (To Do)
+- All future migrations are handled by Flask-Migrate
+- Enum sync runs automatically on every startup