Fixes Connection issues

[martian56]

This pull request introduces several backend and frontend improvements focused on reliability, error handling, and developer experience. The backend now ensures safer participant host assignment and more robust error handling during WebSocket connections. The frontend improves WebSocket reconnection logic and provides fallback defaults for API configuration, making local development easier.

Backend reliability and error handling:

• Ensured the first active participant in a meeting is safely assigned as host using a transaction-safe approach, preventing race conditions. [1] [2]
• Improved error handling when creating participants: now logs errors, closes the WebSocket with a proper error code, and ensures the meeting exists before proceeding.
• Enhanced the broadcast_to_meeting function to safely remove dead WebSocket connections, preventing issues from modifying the connection list during iteration.
• Added support for HTTP HEAD requests on the /health endpoint for better health checks.

Frontend configuration and connection handling:

• Provided default values for API_BASE_URL and WS_BASE_URL in config.ts, simplifying local development when environment variables are missing.
• Improved WebSocket reconnection logic in useWebSocket.ts to prevent unwanted reconnections and memory leaks by checking component mount status and cleaning up references. [1] [2]
• Updated dependencies in the WebSocket message handler in MeetingRoom.tsx to include localStream and chatOpen, ensuring correct effect execution.

[Copilot]

Pull Request Overview

This PR addresses WebSocket connection management and stability issues by improving reconnection logic, error handling, and race condition prevention. It also adds fallback configuration values and health check endpoint support.

• Improved WebSocket reconnection logic to prevent multiple concurrent connections
• Fixed race condition in host assignment by checking participant count before creating records
• Added error handling and dead connection cleanup in broadcast functionality

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
frontend/src/hooks/useWebSocket.ts	Enhanced WebSocket cleanup with mounted state tracking and proper null assignment on disconnect
frontend/src/pages/MeetingRoom.tsx	Added localStream and chatOpen to dependency array for WebSocket message handler
frontend/src/config.ts	Added fallback values for API and WebSocket URLs when environment variables are not set
backend/main.py	Fixed race condition in host assignment, added HEAD method support for health endpoint, improved broadcast error handling, and enhanced connection cleanup

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[Copilot]

The isMounted variable is declared but never used. It's set to true on line 93 and to false on line 96 in the cleanup function, but there are no checks against this variable anywhere in the code. Either remove this unused variable or add logic to check isMounted before reconnecting in the ws.onclose handler to prevent reconnection attempts after component unmount.

[Copilot]

The meeting variable is initialized to None before the database block and checked again after at line 234. However, if the meeting is not found, the code already returns at line 188, making the check at line 234 redundant. The initialization at line 177 and the check at lines 234-235 can be removed to simplify the code flow.