-- Add 'playback' to the diagnostic_events kind whitelist (M9 follow-up).
--
-- `route` and `player_state` events fire for EVERY output route (phone
-- speaker, Bluetooth, UPnP/Sonos), so bucketing them under 'upnp_sync'
-- was misleading — an operator on Bluetooth earbuds saw "upnp_sync"
-- rows. 'upnp_sync' now means genuinely UPnP/Sonos-specific signal
-- (drops, and future resync/desync); general playback + route telemetry
-- moves to the new 'playback' kind.
--
-- Per the enum-CHECK-whitelist rule, the new value lands by dropping and
-- re-adding the constraint in the same change. Existing rows tagged
-- 'upnp_sync' stay as-is (debug telemetry on a 30-day retention).

ALTER TABLE diagnostic_events DROP CONSTRAINT diagnostic_events_kind_check;
ALTER TABLE diagnostic_events ADD CONSTRAINT diagnostic_events_kind_check
    CHECK (kind IN (
        'connectivity', 'upnp_sync', 'power', 'lifecycle',
        'heartbeat', 'http', 'playback'
    ));