felt/.planning/phases/01-tournament-engine/01-08-SUMMARY.md

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
01-tournament-engine	08	seating	table-balancing break-table tda-rules auto-seating dealer-button hand-for-hand chi-router	phase provides 01-tournament-engine table schema, tournament_players schema, audit trail, WebSocket hub, clock registry	BalanceEngine with TDA-compliant suggestion generation and live-adaptive invalidation BreakTableService for fully automatic player redistribution Full REST API for tables, seating, balancing, blueprints, dealer button, hand-for-hand TableService.DB() accessor for cross-service database access	02-multi-device frontend-tournament-view	added patterns live-adaptive-suggestions stale-detection-on-accept clockwise-distance-fairness	created modified internal/seating/balance.go internal/seating/breaktable.go internal/seating/balance_test.go internal/seating/breaktable_test.go internal/server/routes/tables.go internal/seating/table.go	Balance suggestions use clockwise distance from dealer button for move fairness (player closest after button moves first) Stale suggestion re-validation requires fromCount - toCount >= 2 before accepting (ensures move still needed) Break table is fully automatic (applies immediately, result is informational per CONTEXT.md) Blueprint routes are venue-level (not tournament-scoped); admin role required for mutations	Live-adaptive pattern: suggestions are proposals that are re-validated on accept and invalidated on state change Break table distributes by iterating sorted destination tables (ascending player count) for each player	SEAT-01 SEAT-02 SEAT-03 SEAT-04 SEAT-05 SEAT-06 SEAT-07 SEAT-08 SEAT-09	6min	2026-03-01

Phase 1 Plan 8: Table & Seating Engine Summary

TDA-compliant balance engine with live-adaptive suggestions, fully automatic break table, and complete REST API for table/seating management

Performance

• Duration: 6 min
• Started: 2026-03-01T03:19:29Z
• Completed: 2026-03-01T03:25:01Z
• Tasks: 2
• Files modified: 6

Accomplishments

• Balance engine detects unbalanced tables (diff > 1) and generates TDA-compliant move suggestions with button-aware fairness
• Suggestions are live and adaptive: re-validated on accept, auto-invalidated when state changes (bust, move, etc.)
• Break table fully automatically distributes players evenly and deactivates the dissolved table
• Complete REST API covering tables, seating, balancing, blueprints, dealer button, and hand-for-hand
• 15 tests covering balance detection, suggestion lifecycle, stale detection, auto-seat, break table distribution, and dealer button advancement

Task Commits

Each task was committed atomically:

1. Task H1: Table management, auto-seating, blueprints, hand-for-hand - e947ab1 (feat)
2. Task H2: Balance engine, break table, API routes, tests - 2d3cb0a (feat)

Files Created/Modified

• internal/seating/balance.go - BalanceEngine with CheckBalance, SuggestMoves, AcceptSuggestion, CancelSuggestion, InvalidateStaleSuggestions
• internal/seating/breaktable.go - BreakTableService with BreakTable (fully automatic redistribution)
• internal/seating/table.go - Added DB() accessor method for cross-service use
• internal/seating/balance_test.go - 10 tests: balance detection, suggestions, stale detection, auto-seat, dealer button
• internal/seating/breaktable_test.go - 5 tests: even distribution, odd count, deactivation, error cases
• internal/server/routes/tables.go - Full REST API handler with 22 endpoints

Decisions Made

• Balance suggestions use clockwise distance from dealer button for fairness: player closest after button (small blind position) is moved first, as they are least disadvantaged by a move
• Stale suggestion re-validation requires source table to have at least 2 more players than destination (the threshold that makes a move necessary)
• Break table is fully automatic per CONTEXT.md -- moves are applied immediately and result is informational for TD display
• Blueprint CRUD routes are venue-level (not tournament-scoped) with admin role for mutations, read for any authenticated user

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Table and seating engine is feature-complete for Phase 1
• Frontend can integrate table views, balance alerts, and break table UI
• Balance suggestions ready for real-time WebSocket push to connected clients

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Phase: 01-tournament-engine Completed: 2026-03-01