felt/.planning/phases/01-tournament-engine/01-06-SUMMARY.md

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
01-tournament-engine	06	financial	int64 poker buyin rebuy payout bounty pko receipt audit rake	phase provides 01-tournament-engine/plan-03 audit trail and undo engine phase provides 01-tournament-engine/plan-05 buyin configs with rake splits, payout structures with brackets	Financial transaction engine (buy-in, rebuy, add-on, re-entry) PKO bounty transfer with half-split chain tracking Prize pool calculation from all transaction types Payout distribution with int64 rounding (round DOWN, remainder to 1st) CI gate test proving sum(payouts) == prize_pool across 10,000+ inputs Bubble prize proposal/confirm with proportional shaving Receipt generation with sequential numbering and reprint Late registration with level AND time cutoffs plus admin override Season reserve tracking via rake split categories Financial API routes (prize-pool, payouts, transactions, receipts)	01-tournament-engine/plan-07 01-tournament-engine/plan-09 01-tournament-engine/plan-12	added patterns int64 cents for all monetary values (zero float64) Round DOWN to venue denomination, remainder to 1st place Property-based CI gate test with 10,000+ random payout combinations Rake split transactions per category (house, staff, league, season_reserve) Proportional rake scaling for rebuy/addon (different rake amounts)	created modified internal/financial/engine.go internal/financial/engine_test.go internal/financial/payout.go internal/financial/payout_test.go internal/financial/receipt.go internal/server/routes/financials.go	PKO bounty half-split uses integer division (half = bountyValue/2, remainder stays with bounty portion) Unique entry count for bracket selection uses COUNT(DISTINCT player_id) on non-undone buyin transactions Rebuy/addon rake splits are proportionally scaled from buyin rake splits Receipt number is sequential per tournament (COUNT of existing receipts + 1) Bubble prize shaves proportionally from top 3 positions, extending to 5 if needed Late reg checks level AND time cutoffs independently (either exceeded closes registration)	Financial engine pattern: load tournament info, load buyin config, validate, create transaction, audit, broadcast CalculatePayoutsFromPool is a pure function for testability and CI gate Transaction undo marks undone=1 and reverses player state effects	FIN-03 FIN-04 FIN-07 FIN-08 FIN-09 FIN-12 FIN-13 FIN-14	9min	2026-03-01

Plan 06: Financial Engine Summary

Int64 financial engine with buy-in/rebuy/addon/re-entry transactions, PKO bounty half-split, payout calculation with CI gate (10,000+ tests, zero deviation), bubble prize, receipts, and late registration cutoffs

Performance

• Duration: 9 min
• Started: 2026-03-01T03:06:59Z
• Completed: 2026-03-01T03:16:22Z
• Tasks: 2
• Files created: 6

Accomplishments

• Full financial transaction engine processing buy-ins, rebuys, add-ons, re-entries with all validation checks
• PKO progressive knockout bounty transfer with half cash / half bounty split and chain tracking
• CI gate test proving sum(payouts) == prize_pool across 10,000+ random combinations -- zero deviation
• Prize pool auto-calculation from all non-undone transactions minus categorized rake
• Late registration enforcement with level AND time cutoffs, admin override logged in audit trail
• Receipt generation with sequential numbering, venue info, and reprint capability
• Financial API routes for prize pool, payouts, transactions, receipts, bubble prize, and season reserves

Task Commits

Each task was committed atomically:

1. Task F1: Financial transaction engine - 51153df (feat)
2. Task F2: Prize pool, payouts, receipts, and API routes - 56a7ef1 (feat)

Files Created/Modified

• internal/financial/engine.go - Financial transaction engine (buy-in, rebuy, addon, re-entry, bounty, undo)
• internal/financial/engine_test.go - 14 tests for all transaction flows and edge cases
• internal/financial/payout.go - Prize pool calculation, payout distribution, bubble prize
• internal/financial/payout_test.go - 7 tests including CI gate (10,000+ random combinations)
• internal/financial/receipt.go - Receipt generation, retrieval, and reprint
• internal/server/routes/financials.go - API routes for all financial endpoints

Decisions Made

• PKO bounty half-split uses integer division: cashPortion = bountyValue/2, bountyPortion = bountyValue - cashPortion (handles odd cents correctly)
• Unique entry count for payout bracket selection uses COUNT(DISTINCT player_id) on non-undone buyin transactions only (not rebuys, not re-entries)
• Rebuy and addon rake splits are proportionally scaled from the buyin rake split amounts (last split gets remainder for exact sum)
• Receipt numbering is sequential per tournament based on count of existing receipts
• Bubble prize shaves proportionally from top 3 positions, extending to top 5 if the top 3 cannot cover the amount
• Late registration checks level AND time cutoffs independently -- if either is exceeded, registration closes
• Rounding denomination loaded from venue_settings (default 100 cents if not configured)
• Guaranteed pot support: if FinalPrizePool < Guarantee, HouseContribution = Guarantee - PrizePool

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

• Task F2 files were inadvertently included in a prior session's docs commit (56a7ef1) alongside the SUMMARY.md for plan 13. The code content is correct and complete.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Financial engine ready for player management (Plan G) to call ProcessBuyIn/ProcessRebuy on player actions
• Payout calculation ready for tournament completion (Plan I) to apply final payouts
• Season reserve tracking ready for multi-tournament views (Plan L)
• All 21 tests passing, full project builds cleanly

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