Fix category bracket resets and started-tournament mutation guards

[cursor]

Bug and impact

• Editing a completed upstream category knockout match could reset the immediate downstream match but leave later completed matches with stale teams, scores, and winners.
• Started tournaments still allowed guest deletion/group reassignment paths that could dissolve teams or rewrite group membership after matches existed, corrupting fixtures/standings.

Root cause

• Bracket recomputation used a one-time winner snapshot and did not treat matches reset in the same pass as pending feeders.
• Guest delete, group rebalance, and team group PATCH paths were missing started-tournament guards.

Fix

• Recompute category bracket dependencies until downstream slots stabilize, clearing scores/winners for every invalidated match.
• Block guest deletion, group rebalance, and team group changes once a tournament has started; hide guest delete controls after start.
• Return a 400 for rejected rebalance attempts instead of falling through to a server error.

Validation

• npm test -- --run tests/knockoutAdvance.test.ts tests/rebalanceTournamentTeams.test.ts
• npm test
• npm run typecheck
• npm run lint (passes with existing warnings)
• npm run vercel:functions

  

[vercel]

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Project	Deployment	Actions	Updated (UTC)
matchpoint	Canceled		May 26, 2026 11:14am