chore(positions): add diagnostic logging to filing-fee lookup

[dealvz]

Summary

Logging-only follow-up to #165. Surfaces which branch the filing-fee lookup took so we can debug null-fee responses in dev without DB access.

This commit was on the original branch but pushed after #165 merged, so it didn't make it in. Cherry-picking now to unblock active filing-fee debugging on dev.

What it logs

debug level (visible in dev, off in prod unless explicitly enabled). Every lookupFilingFee call emits one of:

• outcome: 'skipped' with reason: 'no_place_id' or 'no_name' — the Position row doesn't have the fields we need to look up a Race.
• outcome: 'no_race_match' — placeId was set, but no Race row matched placeId + positionNames. Also logs sampleRacePositionNames (up to 5 races' position_names arrays for the same placeId) so we can see what names actually exist and decide whether to loosen the join.
• outcome: 'matched' — race(s) found. Logs which race we picked, whether it had filing_requirements / salary, and what extractFilingFee returned (so multi_value / no_match / pct_of_salary_unresolvable show up here too).

Why now

Current state: PR #165 is merged but every filing-fee response in dev comes back null — including for positions where we expected real data (e.g. position c61611f1-7d9d-666f-c759-8fce3c3fc457, "Denver City Council - At Large"). The API response alone can't distinguish "Position has no placeId" from "Race join produced zero rows" — both render as identical-looking nulls. This commit makes the distinction visible in logs.

Risk / blast radius

• Behavior: zero change — only adds this.logger.debug(...) calls.
• Performance: one additional small query (SELECT positionNames FROM Race WHERE placeId = ... LIMIT 5) on the no_race_match branch only. Doesn't fire on the success path.
• Test coverage: existing 45-test suite passes; no test changes needed since logging output is a side effect.

Test plan

• Merge + wait for dev redeploy.
• Hit GET /v1/positions/c61611f1-7d9d-666f-c759-8fce3c3fc457?includeDistrict=true&includeTurnout=true&electionDate=2027-04-06&includeFilingFee=true against https://election-api-dev.goodparty.org.
• Check dev logs for a FilingFeeLookup line. The outcome field tells us which branch fired.

🤖 Generated with Claude Code

---

Note

Low Risk
Low risk: behavior is unchanged aside from additional debug logs and a small extra query only when no races match, with minimal performance impact.

Overview
Adds structured debug-level diagnostics to PositionsService.lookupFilingFee to make null filing-fee responses explainable.

The lookup now logs when it is skipped (missing placeId/name), when there is no race match (including a small sample of Race.positionNames for the placeId), and when a race is matched (including chosen race attributes and the extractFilingFee result).

^{Reviewed by Cursor Bugbot for commit cdfd665. Configure here.}

[claude]

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[delegate-reviewer]

1 blocker. Reply @delegate review after fixing.

[delegate-reviewer]

The diagnostic sampleNames query executes unconditionally on every races.length === 0 path, including production traffic. The database round-trip happens regardless of whether the runtime log level will ever emit the debug message. NestJS Logger has no level-check guard you can call before building the payload, so the only correct fix is to remove the extra query and log only what you already have.

Suggested change

	const sampleNames = await this.client.race.findMany({
	where: { placeId: position.placeId },
	select: { positionNames: true },
	take: 5,
	})
	this.logger.debug({
	event: 'FilingFeeLookup',
	outcome: 'no_race_match',
	positionId: position.id,
	positionName: position.name,
	placeId: position.placeId,
	})