fix(user-data-export): shorten download retention to 24 hours

[St0rmz1]

Summary

The user data export feature set the completed export retention window to 7 days, but the Data Exports UI copy states that downloads expire 24 hours after the export is ready. This changes the retention interval so the behavior matches the stated copy.

Change

• services/user-data-export/src/databases.ts: on export completion, expires_at = now() + interval '7 days' → interval '24 hours'.

Why this makes auto-removal work as described

The cleanup cron already sweeps expired exports:

• expiredObjects() selects status = 'ready' AND expires_at <= now()
• markExpired() deletes the R2 object and marks the row expired

With the shorter interval, exports are now auto-removed ~24 hours after they become ready, matching the UI text.

Related

• UI copy change (7 days → 24 hours) is in fix(web): update data export download expiry copy to 24 hours #5187. This PR makes the backend retention match that copy. Both should land for the page and behavior to be fully consistent.

Testing

• vitest run — 56 passed
• vitest run --config vitest.workers.config.ts — 5 passed

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Single-line retention change (interval '7 days' → interval '24 hours' on export completion) reviewed with high confidence: the SQL is valid, all expires_at consumers (expiredObjects, markExpired, readyObject, pendingNotifications, downloadExpiration) evaluate it dynamically, and the 5-minute cleanup cron enforces expiry promptly. The email template renders expiry_date dynamically, so no copy mismatch there; the Data Exports UI copy still referencing 7 days is unchanged in this PR and is explicitly covered by companion PR #5187. No tests assert the old interval, and no memory-leak or security concerns arise from this change.

Files Reviewed (1 file)

• services/user-data-export/src/databases.ts

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_{Review guidance: REVIEW.md from base branch main}