`recordPlay` emitted `TrackMetadataChanged`, which the frontend
correctly reads as "tags were rewritten" and answers by discarding
every cached collection: measured at 8 binding calls, 71.18 MB across
the IPC and a 765 ms longest task per two track changes at 50 000
tracks — once per song, while clearing the user's selection.
It now emits `TrackPlayCountChanged` with everything needed to patch
the one track in place, read back with `UPDATE ... RETURNING` so the
count cannot drift from the stored one. Measured after: 0 calls, 0 MB,
0 ms.
logan
1d335c5180