Every query on Frames filters on EventId and orders or ranges by FrameId,
and nothing needs a frame by Id. The Id primary key was a clustered index
nothing read, and EventId_FrameId_idx was a secondary index every query
used. On a copy of a local table that secondary index was half the
table's size. With (EventId, FrameId) as the primary key the index is
gone, and an event's rows are stored together, so deleting an event is a
range delete.
zm_update-1.39.36.sql:
- converts AI_Detections.FrameId from Frames.Id to the per-event frame
number, drops its foreign key to Frames and indexes (EventId, FrameId).
A composite foreign key cannot replace it: ON DELETE SET NULL would
have to null the NOT NULL EventId, and Frames rows are written in
batches, so a detection can be recorded before its frame row.
- removes duplicate (EventId, FrameId) rows, keeping the earliest.
- rebuilds Frames with the new primary key.
- removes ON UPDATE CURRENT_TIMESTAMP from Frames.TimeStamp. Any UPDATE
of a frame row was overwriting its capture time.
Each step checks the current schema first, so the migration can be
re-run.
REST API: view, edit and delete take /frames/<action>/<EventId>/<FrameId>.json.
The old single-Id URLs return 404. CakePHP 2 has no composite keys, so
the model's primaryKey is EventId. That keeps Event's dependent cascade
delete limited to the event's own frames. The controller writes with
explicit (EventId, FrameId) conditions instead of save(), which would
match rows on EventId alone. Edit no longer changes EventId or FrameId.
view=image with fid but no eid used to look up Frames.Id. It now returns
404.
The Perl Frame class is identified by (EventId, FrameId).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
