Fix AttributeError crash when backend is unreachable during account linking.
Previously, when telegram bot couldn't connect to backend, the error handler
tried to access e.response.status_code on a ConnectError exception which
doesn't have a response attribute.
Changes to reports-app/telegram-bot/app/api/client.py:
- Import ConnectError from httpx
- Add separate exception handler for ConnectError before HTTPError handler
- Log clear error message indicating backend connectivity issue
- Return None gracefully instead of crashing with AttributeError
Changes to deployment/windows/docs/TELEGRAM_BOT_TROUBLESHOOTING.md:
- Add new section "Problem: Cannot connect to backend / Connection Errors"
- Add diagnostic steps for backend service verification
- Add checklist for BACKEND_URL configuration (http://localhost:8000)
- Add Issue 5: Backend Service Not Running
- Add Issue 6: Wrong Backend URL in Telegram Bot
- Include PowerShell commands for Windows Server troubleshooting
This fix ensures the Telegram bot provides clear error messages when backend
is unavailable instead of crashing, making debugging easier for production
deployments.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
