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bvandeusenandClaude Opus 5.5 66e21a6c60 refactor(notes): a snippet's and lesson's stored title is its name; the trigger joins it only in the embedded document (milestone 427)
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The title was `subject — trigger` because the stored title WAS the
embedded one, and the join is what makes these kinds rank on the
situation they apply to (#2485). Every surface that shows a title then
showed the trigger too -- menus, lists and search rows ran to kilobytes.

- embeddings.document_title(title, note_type, data, body) joins the
  trigger from `data` (body fallback) at embed time. Idempotent: an
  un-migrated composed title comes out the same, never doubled. The
  embed path, the startup backfill and the dedup gate's semantic signal
  all use it, so the embedded text -- and every vector -- is unchanged.
- Writers store the subject: snippet create/update (service, REST, MCP)
  and lesson_document. Both compose_title helpers are removed.
- Readers: dedup takes `data`; the menus strip the embedded title from a
  passage; list rows project `when_to_use`, which SnippetListView reads.
- 0108 rewrites existing rows on an exact `' — ' || <own trigger>`
  suffix with raw SQL, leaving updated_at alone so the backfill does not
  re-embed the corpus for identical vectors. Downgrade recomposes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-23 16:48:28 -04:00
bvandeusenandClaude Opus 5 0ab15d7d80 feat(lessons): the lesson kind, and one join for every trigger title (#3729)
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Milestone 385 step 2, implementing decision #4157 from the step-1 spike.

The kind: `note_type='lesson'`, a note findable by WHEN IT APPLIES rather
than by what it is about. The trigger lives in `notes.data.when_to_apply`,
mirrored into the title and the head of the body — the shape snippets
already use, and the reason nothing re-embeds: chunk_document is untouched,
so CHUNKER_VERSION does not move.

NO MIGRATION, and the step assumed there would be one. `note_type` carries
no CHECK — only `task_kind` does (0056, 0065). Migration 0036 added it as
plain Text with a server default and nothing has gated it since, so rule 36
has no whitelist to expand and #3128's failure mode (a value the database
refuses) cannot arise for this column. The vocabulary that actually decides
what a reader can reach is services.knowledge._FACETS, which since #3161 is
one table feeding the door's validation, the counts and both dialects of
the type filter — so the kind lands there in a single edit.

ONE JOIN, not a fourth copy. `{subject} — {trigger}` had three
implementations: rule_document, snippets.compose_title, and this step
needed another. #3207 records what that costs, so the join moves to
embeddings.trigger_title beside embedding_text and all three delegate.
Behaviour is unchanged for rules and snippets; the guard calls each through
its own public name, so a re-implementation fails it.

The #3163 bill is stated in the service docstring rather than left to be
inferred: versions, supersession, trash, the share ACL, tags, project and
System tagging, chunked embeddings and the duplicate gate are all
inherited; status/task_kind/milestone_id and recurrence are not, and
verify_with/expires_when are available but outside the kind's contract.
The status cell is the one that matters — `is_task` IS `status is not
None`, so a lesson that acquired one would become a task.

The integration guard asserts the WRITE rather than the constraint: it
holds whether or not note_type is ever gated, and goes red only if it is
gated without this value.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy
2026-09-18 15:30:49 -04:00