fix: race condition fractionRegistry stats

[eguguchkin]

• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.38%. Comparing base (fd721bd) to head (969c6d6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   71.41%   71.38%   -0.03%     
==========================================
  Files         210      210              
  Lines       15579    15581       +2     
==========================================
- Hits        11125    11123       -2     
- Misses       3656     3659       +3     
- Partials      798      799       +1     

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