feat: gracefully deprecate BigQuery viewership endpoints

[ecmulli]

Summary

• Adds a noopBigQuery stub that implements the BigQuery interface with empty/nil returns, so viewership endpoints return HTTP 200 with empty/zero data instead of 501 errors when BigQuery is disabled
• Adds DisableBigQuery option to views.ClientOptions to conditionally swap in the stub
• Updates provisionDataAnalytics to always create views and usage clients (instead of returning nil when --disable-bigquery is set), passing the flag through to the views client

Behavior change

Endpoint	Before (--disable-bigquery)	After (--disable-bigquery)
GET /views/query/total/{playbackId}	501 "bigquery is unavailable"	200 {"playbackId":"...","viewCount":0}
GET /views/query	501	200 []
GET /views/query/creator	501	200 []
GET /views/{assetId}/total	501	200 (Prometheus-only count)
GET /views/now (ClickHouse)	501	200 (works normally)
GET /views/internal/timeSeries (ClickHouse)	501	200 (works normally)
Usage endpoints (ClickHouse)	501	200 (works normally)

Test plan

• Deploy with --disable-bigquery and verify viewership endpoints return 200 with empty data
• Verify ClickHouse-backed endpoints (/views/now, /usage/query/*) still return real data
• Verify without --disable-bigquery flag, BigQuery viewership still works as before

Made with Cursor

[ecmulli]

Testing Summary

Ran locally with --disable-bigquery=true (no BigQuery credentials provided). All BigQuery-backed viewership endpoints return HTTP 200 with empty/zero data instead of 501 errors.

Results

Endpoint	HTTP Code	Response	Verdict
GET /views/query/total/{playbackId}	200	{"playbackId": "some-playback-id", "viewCount": 0}	Empty/zero data as expected
GET /views/query	200	[]	Empty array as expected
GET /views/query/creator	404	(empty)	Expected — fake assetId doesn't exist in Livepeer API, so it 404s before BigQuery is ever called (same behavior with BQ enabled)

ClickHouse-backed endpoints (unaffected)

Usage endpoints (/usage/query/total, /usage/query) continue to return real data from ClickHouse as expected.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.86598%. Comparing base (5ead5de) to head (87eb214).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
views/client.go	0.00000%	9 Missing ⚠️
views/bigquery.go	0.00000%	4 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main        #214         +/-   ##
===================================================
- Coverage   29.55145%   28.86598%   -0.68547%     
===================================================
  Files              5           5                 
  Lines            379         388          +9     
===================================================
  Hits             112         112                 
- Misses           252         261          +9     
  Partials          15          15                 

Files with missing lines	Coverage Δ
views/bigquery.go	48.81890% <0.00000%> (-1.58760%)	⬇️
views/client.go	19.20530% <0.00000%> (-0.65771%)	⬇️

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Files with missing lines	Coverage Δ
views/bigquery.go	48.81890% <0.00000%> (-1.58760%)	⬇️
views/client.go	19.20530% <0.00000%> (-0.65771%)	⬇️

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