feat(schema): migration v18 — canonical 21d returns + log-alpha on score_performance#254
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…ore_performance Adds price_21d/return_21d/spy_21d_return/beat_spy_21d/eval_date_21d + log_alpha_21d (canonical 21d log-domain market-relative alpha) to score_performance. Mirrors the producer-side columns written by alpha-engine-data signal_returns._backfill_score_returns. Bumps SCHEMA_VERSION 17 → 18. Powers the judge outcome-IC validation (ROADMAP L480 re-scope). Pairs with alpha-engine-data feat/score-perf-21d-canonical-alpha-260529. archive/test_archive.py green; fresh-DB apply + idempotent re-apply verified. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Prereq (2 of 2) for the judge outcome-IC validation (2026-05-29 L480 re-scope, config #372). Canonical schema migration mirroring the producer-side columns written by alpha-engine-data
feat/score-perf-21d-canonical-alpha-260529.Change
Migration v18 adds to
score_performance:price_21d,return_21d,spy_21d_return,beat_spy_21d,eval_date_21dlog_alpha_21d— canonical 21d log-domain market-relative alphaBumps
SCHEMA_VERSION17 → 18. Pure-additive; existing rows get NULL (treated as "outcome not yet realized" by consumers).Verified
archivetests green (30 passed)ensure_schemaapplies through v18 with all 6 columns presentPairs with
alpha-engine-data PR (producer-side backfill). Both needed; either order is safe (additive + duplicate-column-tolerant).
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