-- pg_trickle 0.40.0 -> 0.41.0 upgrade migration
--
-- v0.41.0 — DVM Correctness: Structural Cache Keys, Placeholder Safety & WAL Transition Guards
--
-- Changes in this release:
--
--   A41-1: Structural snapshot CTE cache key fingerprint.
--     Replace alias-based cache key with a structural fingerprint of the
--     OpTree. No SQL-level change.
--
--   A41-2: Placeholder resolution full-validation assertion.
--     After every placeholder substitution pass, run a strict regex check
--     for remaining __PGS_* / __PGT_* tokens.  Returns a typed error on
--     any unresolved token.  No SQL-level change.
--
--   A41-3: WAL transition eligibility recheck at commit point.
--     Re-check table eligibility (relkind, PK, replica identity FULL)
--     immediately before committing the TRANSITIONING catalog state update.
--     Falls back to trigger mode with a logged warning on failure.
--     No SQL-level change.
--
--   A41-4: Pool worker pg_trickle.enabled check before job claim.
--     Pool workers now check config::pg_trickle_enabled() before claiming
--     each job. No SQL-level change.
--
--   A41-5: Document isolation invariants for job execution modes.
--     Code-level comments added to scheduler. No SQL-level change.
--
-- No schema changes in this release.
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