A2 made narrators/narrators_search NOT NULL DEFAULT '{}' (86f0af6), but an
explicit NULL in an INSERT/UPDATE column list bypasses the column default
— the API media-create path (POST /api/media-items without narrators)
500'd on every call, taking the whole integration suite down with it
(ISBN tests, capture seeds, all direct-DB seeds).
- set_library_type_name() trigger now coalesces NULL narrators/
narrators_search to '{}' at the row level, and its update trigger
widens from BEFORE UPDATE OF library_id to BEFORE UPDATE so every
write path is covered
- defense in depth at the callers: handler create/update normalize nil
to empty slices (normalizeNarrators), scanner seeds the same
(nilToEmpty) for files that carry no narrator credits
- analytics device-usage tests move to the dedicated per-test user
(the shared admin's device list accrues live rows mid-suite — the
documented testuser flapping class)