Overridable classes to record and export events and audit logs

[bsekachev]

Motivation and context

This PR is mainly a code restructuring change for events and audit logging. The goal is to make both recording and export logic overridable via settings, without changing the existing behavior.

What changed

• Added a new cvat/apps/events/record.py module with DefaultEventsRecorder

• Moved core event recording logic there: request_info, record_server_event, record_client_events

• Updated handlers.py so event handler functions keep their current role, but delegate recording to the recorder class

• Enhanced event serializer class (payload must be an object)

• Updated views.py so client event logging also goes through the same recorder abstraction

• Added a settings-based extension point for the recorder: EVENTS_RECORDER_CLASS

• Refactored cvat/apps/events/export.py around DefaultEventsExporter

  • Moved CSV creation into the exporter class
  • Extracted ClickHouse querying into a separate exporter method

• Added a settings-based extension point for the exporter: EVENTS_EXPORTER_CLASS

• Updated export entry points to use the resolved exporter class

Result
Functionally, this PR is intended to preserve the current implementation. The main change is structural: event recording and export are now organized around explicit, overridable classes, which makes them easier to customize in downstream repositories.

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[bsekachev]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

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[codecov]

Codecov Report

❌ Patch coverage is 80.95238% with 24 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cvat/apps/events/export.py	46.66%	16 Missing ⚠️
cvat/apps/events/record.py	93.15%	5 Missing ⚠️
cvat/apps/events/serializers.py	33.33%	2 Missing ⚠️
cvat/apps/events/handlers.py	93.33%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[bsekachev]

@SpecLad review pls