feat: durable, exactly-once ratings with explicit variant × speed pools (P0) - #76
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…ls (P0) Ratings were keyed by (user, variant) and never written at runtime. Rated results now update both players exactly once in their variant x speed pool, applied from the committed event log. - Migration 0044: speed joins the ratings key with finite-value checks, a leaderboard index, the rating checkpoint, the rating_applications ledger (primary key game_id) and rating_blocked_games; it fails closed with operator instructions if legacy variant-only rows exist. 0045 builds the ordered GameEnded index online. - PgRatingsApplier walks GameEnded rows in (xact_id, server_ts, game_id) order below pg_snapshot_xmin (the ADR-0147 committed prefix), so live processing and replay apply one order. Per game: both pool rows are locked in player-id order, both new ratings come from the pre-game rows, and ledger, updates and checkpoint commit together. - Eligibility is folded from the stream only; bot, casual, aborted and every no-show ending are never rated; unprovable streams are blocked. - Consumers: GET /v1/leaderboard/:variant/:speed (no default speed), profiles list every pool, seek ranges read the seek's own pool, and the web leaderboard asks for a time control before loading. ADR-0150 records the owner decisions and design.
# Conflicts: # docs/PROJECT_STATE.md
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughRatings now use separate variant-and-speed pools. A PostgreSQL worker applies eligible committed game endings with checkpointed processing. The API and web app return, select, and display ratings by pool. ChangesDurable rating pools
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Gateway
participant GamesProjectionWorker
participant PgRatingsApplier
participant PostgreSQL
Gateway->>GamesProjectionWorker: start ratings worker
GamesProjectionWorker->>PgRatingsApplier: runBatch()
PgRatingsApplier->>PostgreSQL: read committed GameEnded streams and checkpoint
PgRatingsApplier->>PostgreSQL: write ratings, application records, and checkpoint
PgRatingsApplier-->>GamesProjectionWorker: return batch outcomes
Suggested reviewers: Merge Risk: ⚪ Minimal · up to Ratings now use separate variant-and-speed pools and are applied from committed game endings through a checkpointed worker. API and web consumers select the matching pool. Earlier concerns about permanently blocking valid games, and about unsupported variants stalling rating processing, are resolved. No outstanding issue was found that should block merge. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Validated game results and transactional safeguards constrain rating changes to the appropriate players and pool. No introduced security vulnerability was established in the inspected paths. Deployment and database recovery require coordinated handling. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 46.77% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 62 functions across 40 files. (18 skipped: 18 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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PR Summary by QodoAdd durable exactly-once ratings by variant and speed
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Code Review by Qodo
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…enario Review findings on PR #76: - Qodo: decideRating now takes the committed stream and blocks any ending the authority could not have written: a result that termination cannot have (e.g. a decisive stalemate), a winner contradicting the result, a non-boolean rated flag, or an unknown time-control kind. - Qodo: the k6 API baseline and load README use the pooled leaderboard route; FEATURE_PARITY_AUDIT describes it. - Greptile: test that endings sharing one transaction id (the migration 0040 upgrade case) apply in ending-time order across pages.
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Brings in #77 (message send during session restoration) and #78 (RTL layout reliability). The only textual conflict was docs/PROJECT_STATE.md: main's history is kept verbatim, including its Increments 75 and 76, and the branch's unmerged "Increment 75" ratings drafts are replaced by one appended Increment 77. style.css auto-merged (disjoint hunks). Every #77/#78 file is byte-identical to origin/main.
PR #76 loads no leaderboard until a time control is chosen, so #78's RTL containment fixture waited for rows that never mounted. The fixture now selects blitz after navigation and serves only /v1/leaderboard/standard/blitz with speed-bearing entries, so rows prove the real pool load. Falsified: removing the selection, or choosing bullet, fails all four leaderboard viewports; the fixed spec passes 4/4 and the RTL suite 36/36.
…ackfill The decision-exclusion trigger takes one advisory lock per inserted row. With it installed before the pre_upgrade backfill, a database with many historical unrated endings could exhaust max_locks_per_transaction during the upgrade. 0046 is unpublished, so it now backfills first and installs the trigger after. The backfill needs no guard: its NOT EXISTS clauses exclude every other decision and the held checkpoint row lock keeps appliers out. The new migration test backfills 40 earlier skips inside a rolled-back run of 0046 and requires zero advisory locks (the old order held 40), then migrates for real and requires every skip frozen, the pending ending untouched, and the guard installed. Removing the trigger fails it.
…runbook A ratings batch that fails on anything other than stream data rolls back without advancing the single checkpoint and retries with backoff, so a repeating failure stops every pool. Only the backlog-age alert noticed, and no runbook said what to do. GambitRatingsBatchFailing fires when ratings_batch_failures_total keeps increasing for ten minutes. The new "Ratings batch failures" runbook section separates transient database errors from a repeating one, gives a read-only query for the ending being retried, forbids hand edits and forced decisions, and escalates to the owner. No skip or mark-ineligible command is added. scripts/test/alert-runbooks.test.mjs requires every alert's runbook link to resolve to a RUNBOOKS.md heading and the failure counter to have an alert. Renaming the heading or repointing the expression fails it; promtool check passes, and a scratch promtool unit test confirmed a failure every 30 s fires by 16 min while a single failure never fires.
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @packages/persistence/src/pg/ratings-applier.ts:
- Around line 170-181: Update rateOne so loadStream runs before the try block,
then catch only PersistenceError from the stream-validation path when deciding
whether to persist a sticky block. Remove the broader isStreamDataFailure check
so loader failures and unrelated TypeError, RangeError, or SQL errors propagate
without creating a rating block.
Review comments at @packages/persistence/src/rating-eligibility.ts:
- Around line 73-75: Add runtime catalog validation for created.variant in the
stream-validation block alongside TIME_CONTROL_KINDS, using a catalog available
within persistence rather than importing the API package. Reject unknown
variants with PersistenceError so rateOne can block the game before
applyRatedGame attempts insertion.
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deploy/load/README.mddeploy/load/scenarios/api-baseline.jsdeploy/observability/prometheus/rules/gambit.rules.ymldocs/DATABASE.mddocs/FEATURE_PARITY_AUDIT.mddocs/PROJECT_STATE.mddocs/RUNBOOKS.mddocs/adr/0150-durable-ratings.mddocs/runbooks/backup-restore-drill.mdpackages/api/openapi.jsonpackages/api/src/domain.tspackages/api/src/fakes.tspackages/api/src/openapi/schemas.tspackages/api/src/presenters.tspackages/api/src/routes.tspackages/api/test/resources.test.tspackages/persistence/migrations/0044_rating_pools.sqlpackages/persistence/migrations/0045_rating_order_index.sqlpackages/persistence/migrations/0046_rating_decisions_and_finite_values.sqlpackages/persistence/package.jsonpackages/persistence/src/glicko2.tspackages/persistence/src/index.tspackages/persistence/src/pg/games-projector.tspackages/persistence/src/pg/index.tspackages/persistence/src/pg/ratings-applier.tspackages/persistence/src/pg/ratings-blocks-cli.tspackages/persistence/src/pg/repositories.tspackages/persistence/src/rating-eligibility.tspackages/persistence/src/repositories.tspackages/persistence/test/glicko2.test.tspackages/persistence/test/rating-eligibility.test.tspackages/persistence/test/rating-pools-migration.integration.test.tspackages/persistence/test/ratings-applier.integration.test.tspackages/persistence/test/ratings-blocks-cli.integration.test.tspackages/web/DESIGN.mdpackages/web/e2e/leaderboard.spec.tspackages/web/e2e/rtl-layout-reliability.spec.tspackages/web/index.htmlpackages/web/src/api/client.tspackages/web/src/api/models.tspackages/web/src/app/competition-mounts.tspackages/web/src/app/leaderboard-controller.tspackages/web/src/app/leaderboard-view.tspackages/web/src/app/profile-mount.tspackages/web/src/app/variant-labels.tspackages/web/src/style.csspackages/web/test/api-client.test.tspackages/web/test/leaderboard.test.tspackages/web/test/profile-controller.test.tspackages/web/test/profile-mount.test.tsscripts/check-variant-parity.mjsscripts/test/alert-runbooks.test.mjsscripts/test/check-variant-parity.test.mjsservices/gateway/src/serve.ts
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…stic Four review findings on the ratings applier (Qodo 1 and 3, CodeRabbit 1 and 2), each with a regression test that fails on the old code: - Judge a checkpoint rewind by a horizon read after the checkpoint lock. A checkpoint another applier committed while this one waited looked like a logical restore and replayed history from the origin. - Report a block found from before as already_blocked, so a replay is not counted, listed or logged as a new block. - Load the stream outside the block decision and block only on the new CorruptGameStreamError. An unreadable event version, or any loader, database or runtime failure, now aborts the batch for retry instead of permanently blocking a valid game. - Block a game whose variant is not in the variants catalog before any rating write, instead of failing ratings_variant_fkey on every retry.
GambitRatingsGameBlocked fires on increase(ratings_games_total
{outcome="blocked"}[15m]), so a new block fires it and an old counter
value or a restart reset does not. A promtool rule test proves both and
now runs in CI; the runbook guard pins the metric, label and anchor.
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requireCatalogVariant looked up String(game.variant), so ['standard'] passed while the array itself reached ratings.variant, failed ratings_variant_fkey outside the block path and stalled every pool. A non-string variant is now a CorruptGameStreamError, and the lookup uses the string itself.
…t scrape increase() needs two samples, so a block written during a gateway's startup backfill, before Prometheus first scraped it, never fired GambitRatingsGameBlocked. A second term fires for a blocked series first seen non-zero within 15 minutes; promtool cases cover it, a new series at zero, a reset of an existing series and a flat counter. The drift guard now strips offset durations as it does range selectors.
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Summary
Audit P0 "Ratings with explicit pools". Rated results now update both players durably, atomically and exactly once in an explicit variant × speed pool. Ratings are applied from the committed event log. Before this,
ratingswas keyed(user_id, variant)and nothing at runtime ever wrote it. Design and owner decisions:docs/adr/0150-durable-ratings.md. Handover:docs/PROJECT_STATE.md, Increment 75.Owner decisions applied (2026-09-27)
correspondence.GameCreated.ratedis true, for every ordinary ending (checkmate, resignation, timeout, stalemate, agreement, insufficient material, fifty-move, threefold, variant).*result.Design
PgRatingsApplierreads committedGameEndedrows in(xact_id, server_ts, game_id)order, and only belowpg_snapshot_xmin. This is ADR-0147's committed prefix, so live processing, restarts, backfill and replay all apply one identical order.FOR UPDATE SKIP LOCKED. Per game:rating_applicationsrow (primary keygame_id, the exactly-once guard), both updates and the checkpoint commit together.gamesprojection is never read. Account checks run underFOR KEY SHARE.rating_blocked_gamesand never rated automatically. Any transient error aborts the batch with nothing changed.Consumer contract changes
GET /v1/leaderboard/:variant/:speedreplaces/v1/leaderboard/:variant. The old route returns 404, and an invalid speed returns 422.RatingViewandLeaderboardEntrygainspeed.openapi.jsonis regenerated./v1/users/:handle/ratingslist every pool separately.(variant, classifySpeed(timeControl))pool, starting at 1500 when the player has no row there.Variant · Speed.ratings_games_total{outcome}andratings_batch_failures_total.Test plan
npm run build,npm run lintnpm test(hermetic): 3,581 passed, 0 failed, 0 skippedcheck:*guards pass.analysis,auth-responsive) passed only on retry under parallel load.Do not merge: the owner performs every merge.
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