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72a490778b
migrationRunner.ts (1124 lines, frozen-baselined) is the startup migration
orchestrator. As a conservative, zero-behaviour-risk first slice, extract the
six static migration-compatibility DATA tables (verbatim) into a pure-data
leaf, leaving the entire orchestrator + all SQL-running helpers in the host:
- migrationRunner/constants.ts (118) RENAMED_MIGRATION_COMPATIBILITY,
LEGACY_VERSION_SLOT_MIGRATIONS, SUPERSEDED_DUPLICATE_MIGRATIONS,
PHYSICAL_SCHEMA_SENTINELS, INITIAL_SCHEMA_SENTINELS,
OPTIONAL_FTS5_MIGRATION_VERSIONS
Host migrationRunner.ts: 1124 -> 1023. The runtime fts5SupportCache (a
WeakMap, mutable state) stays in the host. No public API change (these consts
were module-internal). Data moved byte-identical (sed-extracted, verbatim
verified); the only host edits are the leaf import + one prettier collapse of
a pre-existing 2-line union type annotation to 1 line (token-identical,
typecheck-confirmed).
Characterize-first (operator-chosen): the existing db-migration-runner.test.ts
(26 tests) + no-migration-collisions/weak-rng-fixes/check-db-rules (11) prove
the reconciliation/dedup/already-applied BEHAVIOUR is unchanged; the new
tests/unit/db-migrationrunner-constants-split.test.ts (7 tests) PINS THE DATA
(counts + shape + spot-checks of every table) so a dropped/transposed row is
caught immediately.
Refs #3501.