sstojak1 opened a new issue, #7557:
URL: https://github.com/apache/incubator-devlake/issues/7557
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## What and why to refactor
What are you trying to refactor? Why should it be refactored now?
CalculateChangeLeadTimeMeta subtask is slow when there are a lot of records
in the tables that are used to calculate the needed metrics that will
eventually end up in the 'project_pr_metrics' table.
Queries that are slow for us are the ones that are called in
`getFirstCommit` and `getFirstReview` methods.
They are querying `pull_request_commits` and `pull_request_comments` tables.
Our fix was to add an index to `pull_request_id` on both tables.
## Describe the solution you'd like
How to refactor?
Introduce index by pull_request_id for `pull_request_commits` and
`pull_request_comments` tables.
## Related issues
Please link any other
## Additional context
Add any other context or screenshots about the feature request here.
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