## 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
Participants are created with externalId=null by default, causing the
LLWS simulator to crash at runtime. Fix in two parts:
1. Name-prefix inference: if externalId is null, participants whose
name starts with "US " or equals "US" are assigned to the US side;
all others are assigned to Intl. Pools are always randomized when
inferred (no pool suffix).
2. Admin UI: add an inline-editable "Group" column to the Manage
Participants page so admins can explicitly set externalId for any
simulator that uses it (LLWS, and future cases like NHL conferences).
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
* Add LLWS bracket Monte Carlo simulator
Simulates the 20-team Little League World Series: pool play round-robin
(5 teams/pool, top 2 advance) → 4-team double-elimination per side
(US and International) → consolation game → World Series final.
Uses championship futures odds as the sole win-probability signal.
Pool assignments are auto-detected from externalId: bare "US"/"Intl"
randomizes pools each simulation (pre-draw mode); "US:A"/"Intl:B" etc.
uses fixed assignments (post-draw mode). Sides can differ.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* Fix oxlint violations in LLWS simulator
- Replace non-null assertions with null-safe access (! → ?? / optional chaining)
- Replace .sort() with .toSorted() per linting rules
- Promote bump() to simulate() scope and pass it into simulateSideBracket,
removing the need to pass counts into that function
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
