✨ [#538] Improve performance and add tests

[danielmursa-dev]

Fixes #538

• Added PyInstrumentMiddleware for profiling
• Extended performance test action with locust execution
• Fixed get_queryset with select_related
• Changed ObjectUrlField to CachedObjectUrlField

GeometryField issue -> #538 (comment)

Results before improvements:

• concurrent: https://github.com/maykinmedia/objects-api/actions/runs/15113315449/job/42477662337?pr=596#step:4:118
• single: https://github.com/maykinmedia/objects-api/actions/runs/15113315449/job/42477662337?pr=596#step:5:683

Results after improvements:

• concurrent: https://github.com/maykinmedia/objects-api/actions/runs/15113493879/job/42478246311?pr=596#step:4:118
• single: https://github.com/maykinmedia/objects-api/actions/runs/15113493879/job/42478246311?pr=596#step:5:683

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.68%. Comparing base (ebc4ae8) to head (b8e445c).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/objects/api/fields.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #596      +/-   ##
==========================================
- Coverage   94.77%   94.68%   -0.09%     
==========================================
  Files         148      148              
  Lines        5164     5171       +7     
==========================================
+ Hits         4894     4896       +2     
- Misses        270      275       +5     

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[stevenbal]

@danielmursa-dev the changes themselves looks good, but I can't see if the concurrent performance changed after them. Could you maybe reorder the commits to first add the performance tests, run them to see the current performance and then push the changes to see how they affect the response times?

[stevenbal]

In the meantime we'll probably have to wait until we have more info from Utrecht, Alex mentioned in the taiga issue that we can't see the tracing info in APM for the slow requests

[stevenbal]

@danielmursa-dev you can rebase on master to fix the failing image scanning job

[stevenbal]

It does improve performance so I'll approve, but I don't think this solves the issue that's causing the outliers in the taiga issue, so I'll keep the github issue open for now. We'll have to hear back from Sander once he's done more tests (with the transaction rate in elastic APM set to 1, to make sure we have more trace info) or do tests ourselves to figure this out I think