fix(api): type day_summary, label and sleep type as nullable

[drakulavich]

Found by an api-drift-watcher run against the live Oura spec — the first run able to reach cloud.ouraring.com (the egress block recorded in docs/loops/api-drift-watcher-state.md is gone).

Finding

Three fields the CLI reads are nullable in the spec and were declared string:

Field	Spec (1.37)	Was	Now
daily_stress.day_summary	anyOf[PublicDailyStressSummary, null]	string	string | null
workout.label	anyOf[string, null]	string	string | null
sleep.type	anyOf[PublicSleepType, null]	string	string | null

None is in the schema's required list.

Impact

No runtime breakage today. Every backing column is nullable TEXT (daily_stress.day_summary, workouts.label, sleep_model.type), so a null inserts cleanly, and queries.ts already reads day_summary back as string | null. importDaily even writes w.label ?? '' — defensive code that the old type made look dead.

The problem is the contract: the declared types promised a value that the API does not guarantee, so a new reader could reasonably skip a null check and tsc would agree with them.

Change

Types only, no behaviour change. bunx tsc --noEmit passes with no downstream edits needed, which confirms nothing was relying on the non-null claim in a way that breaks.

The new test drives importDaily through a stub client returning nulls in all three fields and asserts what actually lands in SQLite.

One thing worth a decision (not changed here)

importDaily coerces a null workout label to '' rather than storing NULL, which collapses "no label" and "empty label" into the same value. The test pins the current behaviour rather than changing it — happy to switch it to NULL in a separate PR if you'd prefer the distinction preserved.

Not in scope

day_summary and type are enums upstream (restored|normal|stressful and deleted|sleep|long_sleep|late_nap|rest), still typed as open string. Narrowing them is a separate change.

Verification

bun test          129 pass, 0 fail   (was 128)
bunx tsc --noEmit clean

[greptile-apps]

Greptile Summary

The PR aligns three API response fields with the upstream nullable and optional contract.

• Makes OuraStressDay.day_summary, OuraWorkout.label, and OuraSleepModel.type optional and nullable.
• Explicitly stores omitted stress summaries and sleep types as SQL NULL.
• Adds import coverage for explicit nulls and omitted properties.
• Documents the corrected API contract in the changelog.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the previously reported required-property mismatch is fixed by marking all three fields optional as well as nullable.

Important Files Changed

Filename	Overview
src/api/types.ts	The three fields are now both optional and nullable, fully addressing the previously reported mismatch with responses that omit them.
src/db/import.ts	Optional stress summaries and sleep types are normalized to SQL NULL, while existing workout-label normalization remains unchanged.
src/db/import.test.ts	Tests cover explicit null values and omitted properties through the complete import path.
CHANGELOG.md	The changelog accurately describes the corrected types and import normalization.

_{Reviews (2): Last reviewed commit: "fix(api): mark the three fields optional..." | Re-trigger Greptile}