Read integrity, as-of context, and the shadow matchup resolve (A1-A7)

Seven orders of measurement-first repair. The served grade does not move.

A0/A1 — the unordered page walk returned the right COUNT and the wrong ROWS:
410-617 of 2,490 duplicated with an equal number never returned, while
rows.length matched the server exactly. safePaginate orders on a real unique
key, verifies the tuple at runtime, and THROWS on a query error instead of
treating it as end-of-data. Both hits PROVES are withdrawn: they were drawn
through that reader, and defense_by_direction's distinct-n was likely below
the gate floor all along.

A2/A2b — rolled across every reader: 11 FAIL -> 0. Composite keys pulled from
pg_index (the context tables are dated-composite and had no single unique
column). The unordered helper is deleted, not parked.

A3 — ledgerService and retentionService defaulted the SAME env var to
DIFFERENT versions, so no ledger row ever carried the marker eligibility
requires. One source now. model_snapshots settlement moved onto the cron:
15,484 -> 28,894 settled, repaired-champion 0 -> 7,556.

A4 — hitsFactorContext takes an as-of cutoff. Refusal over reconstruction: no
row at-or-before the date means the factor does not apply, never the nearest
row. Live path unchanged, proven 400/400 on real rows.

A5 — factor_inputs freezes what the factor READ, never the multiplier, so an
audit can recompute and check. It also recorded the finding: the three hits
factors have NEVER fired. prop.opponent and prop.opposing_pitcher are read by
the resolver and written by nothing.

A6/A7 — matchupKeys resolves those keys from the posted lineup plus the
schedule's probable pitchers, and fires the factors into a SHADOW freeze:
248 fires on 308 props, 245 of which would move the grade. The served
forecast is untouched. specs/a8-shadow-factor-gate.md pre-registers the test
that decides whether they ever go live.

Nothing is turned on. CALIBRATION_DEPLOYED stays []. Both verdicts stay
withdrawn. 4,772 tests / 371 suites green, web build exit 0, read-integrity
harness 34/34.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

scripts/skill-v1-stagea.js

@@ -43,6 +43,8 @@ const reg = require('../src/services/model/featureRegistry');
 const mlb = require('../src/services/adapters/mlbStatsAdapter');
 const { nameKey } = require('../src/utils/playerName');
 const { knownRate } = require('../src/utils/known');
+const { paginate } = require('../src/utils/safePaginate');
+const { uniqueKeyFor } = require('../src/utils/tableKeys');
 
 /** Team games played by the 2026-07-21 profile freeze — turns season PA into PA/game. */
 const GAMES_SO_FAR = Number(process.env.STAGEA_GAMES_SO_FAR || 103);
@@ -100,18 +102,30 @@ function bootstrapDiff(rows, keyA, keyB, iters = 4000, seed = 20260803) {
   };
 }
 
-async function page(sb, table, select, apply) {
-  const out = [];
-  for (let from = 0; ; from += PAGE) {
-    const { data, error } = await apply(sb.from(table).select(select)).range(from, from + PAGE - 1);
-    if (error) throw error;
-    if (!data || data.length === 0) break;
-    out.push(...data);
-    if (data.length < PAGE) break;
-  }
-  return out;
+// ── THE SAFE WALK (Fix A2/A2b) ────────────────────────────────────────────
+// This script used to walk pages with `.range()` and NO ORDER BY. Measured on
+// production, that returned the correct row COUNT and the wrong ROWS: up to
+// 33.6% of a read came back twice while an equal share never came back at all,
+// so `rows.length` looked perfect while a fifth of the sample was missing.
+//
+// `pageSafe` routes every read through `src/utils/safePaginate`: a stable ORDER
+// BY on the table's real UNIQUE key — single OR composite, looked up from
+// `src/utils/tableKeys` rather than assumed — a runtime tuple-uniqueness check,
+// and a THROWN error instead of a silent stop. The old unordered helper is gone
+// rather than left beside it, because a dead broken helper is an invitation.
+async function pageSafe(sb, table, select, apply, key = uniqueKeyFor(table)) {
+  return paginate(() => apply(sb.from(table).select(select)),
+    { key, pageSize: PAGE, label: `${table}` });
 }
 
+/** THE MEASURED READS — main() and the harness call the same functions. */
+const READS = {
+  ledger: (sb) => pageSafe(sb, 'ledger_entries',
+    'id, player_key, player_name, line, side, outcome, game_date, p_win, quarantine_reason',
+    (q) => q.eq('sport', 'mlb').is('user_id', null).eq('stat', 'hits')
+      .in('outcome', ['hit', 'miss'])),
+};
+
 /**
  * `date|team` → the starter that team FACED.
  *
@@ -165,7 +179,7 @@ async function main() {
   const sb = createClient(SB_URL, SB_KEY, { auth: { persistSession: false } });
 
   // Frozen skill profiles — by name (batters) and by source_id (pitchers).
-  const statcast = await page(sb, 'statcast_aggregates', '*', (q) => q.eq('sport', 'mlb'));
+  const statcast = await pageSafe(sb, 'statcast_aggregates', '*', (q) => q.eq('sport', 'mlb'));
   const freeze = statcast.reduce((mx, r) => (String(r.updated_at) > mx ? String(r.updated_at) : mx), '');
   const freezeDate = freeze.slice(0, 10);
   const batters = new Map();
@@ -182,8 +196,8 @@ async function main() {
     }
   }
 
-  const led = await page(sb, 'ledger_entries',
-    'player_key, player_name, stat, line, side, outcome, game_date, p_win, team, opponent, quarantine_reason',
+  const led = await pageSafe(sb, 'ledger_entries',
+    'id, player_key, player_name, stat, line, side, outcome, game_date, p_win, team, opponent, quarantine_reason',
     (q) => q.eq('sport', 'mlb').is('user_id', null).eq('stat', 'hits')
       .in('outcome', ['hit', 'miss']).not('p_win', 'is', null));
 
@@ -276,4 +290,9 @@ async function main() {
   process.exit(0);
 }
 
-main().catch((e) => { console.error(e); process.exit(1); });
+if (require.main === module) {
+  main().catch((e) => { console.error(e); process.exit(1); });
+}
+
+// Exported so the read-integrity harness measures THE REAL FUNCTION.
+module.exports = { READS };