Work-order #4 closed. First post-deploy snapshot (2026-07-17 14:00:53 UTC)
re-graded with the fix. Before → after:
- projection==0: 9/25 → 0/25 (the nine now refuse)
- grade<->confidence: mismatch → 25/25 agree
- edge_pct: {20,60,100,140} cluster → 7 continuous values, all-positive projections
The lone remaining edge=100 is a REAL projection (Abreu hits, line 0.5, proj 1.0
over = 100% by (model-line)/line), not the old proj=0 degeneracy. Verified.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
scripts/validate-grade-fix.js checks the live MLB snapshot for the three
degradation signatures (projection=0, edge=100 cluster, grade/conf disagreement)
— run after the next 14:00 UTC regrade to fingerprint the fix. The finding doc
now records root causes, fixes (commits 888d103/9fc4edf), the blast-radius SQL
(box can't reach Supabase directly), and the shared-path note for NBA/WNBA.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
DISPLAY FIX (shipped): the league leaderboard rendered raw snake_case
("stolen_bases U0.5", "earned_runs U2.5"). New canonical short-label lib
web/src/lib/statAbbrev.js (one source, CommonJS + unit-tested) maps stat_type
to SB/ER/TB/HR/K/PTS/… and ExploreHub routes through it. Unknown ids upper-case
their words so raw snake_case can never leak again.
FLAG (reported, NOT silently changed — per the audit's instruction): the "B at
45% confidence" is a BACKEND grading issue, diagnosed against live snapshot:
- 25/25 grades mismatch their own confidence vs grade_thresholds.json (B shown
at conf 55 = the B- band; a systematic one-sub-tier gap on every prop). The
surfaced `confidence` is not the probability that derived the letter (likely
the data-sufficiency penalty applied to display-only).
- 9/25 have projection=0 — the MLB feature path feeds 0 instead of refusing
(S58 insufficient_data), which also produces the P1-7 broken edge_pct.
Full write-up + do-not list: specs/audit-data/mlb-grade-degradation.md. NOT
re-lettering or shifting thresholds on the frontend — that would hide the bug.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
builtbykev