The reviewer host's collector.sqlite was created by an earlier build, before the
`kind` column. CREATE TABLE IF NOT EXISTS shapes only a new database, so every query
naming the column failed: the collector's /health (container unhealthy), every
booth ingest, and the trainer's readiness — whose stdlib server printed the
traceback and dropped the socket, which the collector could only render as
"trainer not reachable: fetch failed". Nine days like that.
- CollectorDb.#migrate(): PRAGMA table_info against the list of columns added
since the first deploy; ALTER TABLE ADD COLUMN for each missing one (all
nullable or defaulted). Append to that list whenever a column joins the CREATE.
Test replays the original schema: health, ingest, stats, a legacy row reads
back with the defaults.
- Trainer Handler._guarded(): any unexpected exception → 500 JSON naming it,
never a dropped connection; /health keeps answering. Test drives readiness
against an old-schema DB.
- The collector's training status proxy includes the trainer's error text.
Wiki: the incident and the schema rule (vision-review-outbox), what the message
means (bodytype-classifier-training), log. Deploy: the new collector migrates on
start; nothing manual.
Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU
julian
f4b806a538