Fix plugin lookup, refactor library enumeration, and update pytest

[mashcroft3]

Summary

This PR introduces a bug fix for plugin database lookups, a performance and reliability refactor for Python package enumeration, and an enhancement to the pytest configuration.

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Changes

• pytest.ini:

  • Added norecursedirs to the [pytest] configuration. This prevents the test collector from scanning virtual environments (*/venv/*, */site-packages/*) and temporary directories (test/tmp), improving performance and preventing the execution of third-party tests.

• transformerlab/db/db.py:

  • BUG FIX: The save_plugin function was modified to query for plugins using select(Plugin).where(Plugin.name == name) instead of session.get(Plugin, name).
  • Reason: The previous implementation incorrectly assumed the name field was the primary key. This change corrects the lookup logic to query against the unique name column, resolving an issue where existing plugins could not be found and updated.

• transformerlab/routers/serverinfo.py:

  • REFACTOR: The get_python_library_versions endpoint was updated to use importlib.metadata to enumerate installed packages.
  • Reason: This removes the need for a subprocess call to pip, which improves endpoint performance and security. The previous pip method is retained as a fallback for increased resilience.

[codecov]

Codecov Report

❌ Patch coverage is 46.15385% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
transformerlab/routers/serverinfo.py	45.45%	10 Missing and 2 partials ⚠️
transformerlab/db/db.py	50.00%	1 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[deep1401]

Does this work with the correct python executable if we have multiple of them locally?

[mashcroft3]

yes this enumerates the distributions visible to the interpreter running the server (the same as sys.executable)!

[deep1401]

All changes work for me but I think the plugin one might be unnecessary as that function doesn't get used

[deep1401]

I think this is a leftover function, we dont use this one anymore or the associated parent function, I think?

[mashcroft3]

it gets used in plugin_download but maybe that endpoint is no longer used? mainly there was a test associated with this function that was failing locally

[deep1401]

The plugin_download function is deprecated now. Do we also get rid of the test then?

[deep1401]

Tried this change and it worked for me