Feat/ttlfixes

[Youmanvi]

• Exit deletes room: Added missing /leave route in the Node.js proxy; backend now deletes the
  room when the creator leaves or the room becomes empty, cancels the TTL scheduler, and
  clears all Redis state (join timestamps + user active-room pointers)
• Multi-round support: StartRoundByRoomID searches for a CREATED round by status instead of
  taking Rounds[last] (non-deterministic GORM order); CheckRoundLimitExceeded now counts only
  non-ENDED rounds so completed rounds don't block new ones; EndRoundByRoomID finds
  the actively STARTED round explicitly
• Round start resilience: handleStartRound now uses a try-start → create-if-404 → retry-start
  pattern instead of a roundReady frontend state flag, making it robust against popup reopens
  and WS delivery delays; if create fails with "round limit exceeded" it fetches room state and
  syncs roundStarted directly
• Room-level timer: Timer countdown begins at room creation (not round start) and is never
  reset by round events; round-start WS handler no longer recalculates endTime; checkActiveRoom
  restores timer from room.expiresAt
• FK cascade on round deletion: Added OnDelete:CASCADE to round_problems join table;
  deleteRoom explicitly removes submissions, participants, and join-table rows to avoid FK
  violations
• Error messages: Frontend now checks data.message (Echo's format) in addition to data.error
  so the actual backend message is shown
• clearMessages on round end: Chat history is cleared when a round ends so a new round starts
  with a fresh chat

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Project	Deployment	Actions	Updated (UTC)
bsg	Ready	Preview, Comment	Mar 30, 2026 11:44pm

[Eskan0r]

wait till calvin merges his pr and then pull and check for merge conflicts and then merge yours. ik u pr'd first but ik ur goated with the merge conflicts 😎

[Owen-Isenhart]

lgtm simple enough