Replace the mocked test for #63398's REINDEX strategy: the original
monkeypatched _db_opens_cleanly to return the corruption string, so the
REINDEX pass itself was never exercised against actual index corruption —
the test would pass even if REINDEX didn't fix anything.
New fixture _corrupt_btree_index() builds genuine on-disk staleness with a
writable_schema hack: rewrite the index definition to a partial index
(WHERE 0), REINDEX so the b-tree is rebuilt empty, then restore the full
definition. integrity_check then reports the real
'wrong # of entries in index idx_messages_session' / 'row N missing from
index' class from #63386 — no mocks anywhere.
The rewritten test asserts end-to-end with real function calls:
- the real _db_opens_cleanly detects the stale index,
- repair_state_db_schema repairs it with strategy 'reindex_btree',
- post-repair the detector and raw PRAGMA integrity_check both report
healthy, and a query forced through the rebuilt index (INDEXED BY) sees
every row.
Adds a second test asserting the REINDEX strategy is non-destructive
(all sessions/messages survive, readable via SessionDB).
Follow-up to #63398; refs #63386
Teknium
2d6b95cf2f