Fix AbortController timer leaks in fetch timeout paths

[Copilot]

clearTimeout was called after await fetch(...) in both /api/video and /api/transcribe, meaning timers were never cleared when the request aborted or threw a network error.

Changes

• /api/video/route.ts — chain .finally(() => clearTimeout(timeout)) on the backend fetch so the 15s timer is always cleared
• /api/transcribe/route.ts — same fix for the 8s YouTube backend fetch timeout

Before / After

// Before — timer leaks on abort/throw
const response = await fetch(url, { signal: controller.signal });
clearTimeout(timeout); // never reached if fetch throws

// After — always clears
const response = await fetch(url, { signal: controller.signal })
  .finally(() => clearTimeout(timeout));

Also confirmed in previous commits:

• transcript_segments correctly handles both transcript[] and transcript.segments[] shapes
• ENABLE_VERTEX_AI is parsed as a strict boolean ("1" | "true" | "yes") so values like "0" no longer trigger the slow Vertex AI metadata probe

---

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[vercel]

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Project	Deployment	Actions	Updated (UTC)
v0-uvai	Error		Feb 27, 2026 10:54pm

[railway-app]

🚅 Deployed to the EventRelay-pr-37 environment in EventRelay

Service	Status	Web	Updated (UTC)
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[vercel]

Additional Suggestion:

Missing Firebase Data Connect SDK module and implicit type errors prevent build compilation

[Copilot]

Pull request overview

This PR fixes timer leak bugs where clearTimeout was placed after await fetch(...), meaning timers were never cleared when a fetch threw (e.g., due to network errors or AbortController abort). By replacing the post-await clearTimeout call with .finally(() => clearTimeout(timeout)), the timer is guaranteed to be cleared in all execution paths.

Changes:

• Moved clearTimeout into .finally() on the backend fetch call in /api/video/route.ts to guarantee the 15s timer always clears.
• Same fix applied in /api/transcribe/route.ts for the 8s backend fetch timer.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
apps/web/src/app/api/video/route.ts	Chains .finally(() => clearTimeout(timeout)) on the backend fetch so the 15s AbortController timer is always cleared
apps/web/src/app/api/transcribe/route.ts	Same fix for the 8s AbortController timer guarding the YouTube backend fetch