#58 - Recommender only ever trained once

[reckart]

What's in the PR

• Lock should not be bound to the current thread since we use it to synchronize across threads

How to test manually

• See issue description

Automatic testing

• PR includes unit tests

Documentation

• PR updates documentation

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 51.96%. Comparing base (409739b) to head (5fad012).

Files	Patch %	Lines
ariadne/server.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
- Coverage   52.08%   51.96%   -0.12%     
==========================================
  Files          24       24              
  Lines         887      889       +2     
==========================================
  Hits          462      462              
- Misses        425      427       +2     

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