## Summary
- **Root cause**: `statsapi.mlb.com` returns 406 (deprecated). Switched MLB to ESPN's free standings API (`site.api.espn.com/apis/v2/sports/baseball/mlb/standings`), consistent with NBA, WNBA, and MLS.
- **Refactor**: Extracted a shared `espn.ts` utility module, eliminating 4× duplication of `statsMap()`, `flattenEspnStandings()`, ESPN interfaces, and the `playoffSeed` → conference rank logic across adapters.
- **Bug fixes** found during review and applied across all affected adapters:
- `parseConferenceRank`: `|| undefined` falsy-zero bug replaced with `isNaN` guard
- Sort comparators: stable alphabetical tiebreaker added to MLB, NBA, WNBA
- `winPct`: falls back to `wins/(wins+losses)` if ESPN omits the stat (was silently 0)
- statsMap pre-built once per entry before sorting in all adapters (was rebuilt per comparison)
- WNBA `parseEntry`: accepts pre-computed `sm` instead of rebuilding it internally
- MLB `gamesBack`: tests updated to reflect ESPN returns numeric `0` for division leaders (old API used `"-"` → `undefined`)
## Test plan
- [ ] All 60 standings-sync unit tests pass (`npm run test:run -- app/services/standings-sync`)
- [ ] Trigger MLB standings sync from admin panel and confirm it returns data without a 406
- [ ] Confirm NBA, WNBA, MLS syncs still work (adapters touched but behaviour unchanged)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Chris Parsons <chrisparsons1127@gmail.com>
Reviewed-on: #62
* Fix MLB streak doubling bug, hide empty standings columns, improve mobile layout
- mlb.ts: use streakCode alone (the API already returns the full string like
"W3"); appending streakNumber was doubling the digit, causing "L33" display
- Update mlb.test.ts mocks to match real API format (streakCode "W3" not "W")
- RegularSeasonStandings: conditionally hide GB/L10/STK columns when no rows
have data, so pre-season or stats-free sports don't show blank columns
- Mobile two-row layout: GP/PCT/GB/L10 move to a secondary sub-row (sm:hidden)
so all data stays visible without horizontal scroll on small screens; STK and
W/L remain on the primary row; reduce min-w from 740px to 360px
https://claude.ai/code/session_01RADi3LhYMPbRDm5no1ZpdF
* Address code review: cleanup mlb streak type, fix soccer GP on mobile, hoist showSubRow
- mlb.ts: drop redundant `?? undefined` after optional chain; document that
streakCode is the full string (e.g. "W3") and streakNumber is unused
- RegularSeasonStandings: hoist hasSecondaryStats → showSubRow to component
level (it only depends on a prop, not on individual row data)
- Remove non-functional `truncate`/`min-w-0` from team name cell — truncation
requires table-layout:fixed which we don't use; team names size naturally
- Soccer GP was hidden on mobile with no sub-row to surface it; GP now shows
inline for soccer on all viewports, hidden only for non-soccer (which has
the secondary sub-row)
- Add comment explaining totalCols counts hidden-on-mobile columns for colSpan
- Add missing test for GB column hiding when no rows have gamesBack data
https://claude.ai/code/session_01RADi3LhYMPbRDm5no1ZpdF
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Co-authored-by: Claude <noreply@anthropic.com>
* Add MLB playoff simulator with AL/NL division standings, fixes#121
- New `mlb-simulator.ts`: 50k Monte Carlo sim drawing division winners
(weighted by p_div) and 3 WC teams per league, then simulating
WC best-of-3 → DS best-of-5 → LCS best-of-7 → World Series.
Elo parity factor 350; blends Vegas odds 30/70 when sourceOdds available.
- New `standings-sync/mlb.ts`: adapter for free statsapi.mlb.com API,
mapping AL/NL conferences, division ranks, streaks, home/away/L10 splits.
- New `mlb-divisions` display mode in RegularSeasonStandings: shows 1 division
winner per division section + Wild Card section with 3-spot playoff line,
headings read "AL/NL League" instead of "Conference".
- Refactored buildNhlSections/buildMlbSections into shared buildDivisionSections
(divisionSpots + wcSpots params); conferenceLabel now flows through group
objects rather than being derived from displayMode in the render.
- DB migration 0062 adds `mlb_bracket` to simulator_type enum.
- 37 new tests across simulator, adapter, and component.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* Fix flaky tennis simulator test: increase trials and lower threshold
500 trials with a ~3–5% expected win rate had enough variance to
occasionally land below the 0.03 threshold (~2% failure rate).
Bumping to 2000 trials reduces the std dev by 2x; lowering the
threshold to 0.02 keeps the assertion meaningful (still well above
random 0.78%) while eliminating the flakiness.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
