perf(cache): add secondary index for categories

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

Patch coverage: 60.00% and project coverage change: -0.05 ⚠️

Comparison is base (9ff8a6c) 69.89% compared to head (611b32b) 69.84%.

❗ Current head 611b32b differs from pull request most recent head 4538e6c. Consider uploading reports for the commit 4538e6c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #701      +/-   ##
==========================================
- Coverage   69.89%   69.84%   -0.05%     
==========================================
  Files          63       63              
  Lines       11969    11990      +21     
==========================================
+ Hits         8366     8375       +9     
- Misses       2828     2833       +5     
- Partials      775      782       +7     

Impacted Files	Coverage Δ
storage/cache/sql.go	78.05% <47.36%> (-2.02%)	⬇️
storage/cache/mongodb.go	81.00% <100.00%> (+0.19%)	⬆️

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.