Limit parallel queries to 4 threads

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (0a1561a) 69.38% compared to head (8e5e82f) 69.38%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #877 +/- ## ======================================= Coverage 69.38% 69.38% ======================================= Files 51 51 Lines 2450 2450 ======================================= Hits 1700 1700 Misses 750 750 ```

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