Do not record a context for gain files

[stephen-riggs]

This was in the no-serialem branch, but I'm doing it separately here to get it into the next patch as it seems to be causing active problems

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 32.92%. Comparing base (7a14ecc) to head (2342ed2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #633      +/-   ##
==========================================
- Coverage   32.93%   32.92%   -0.01%     
==========================================
  Files          90       90              
  Lines       11125    11127       +2     
  Branches     1467     1468       +1     
==========================================
  Hits         3664     3664              
- Misses       7331     7332       +1     
- Partials      130      131       +1     

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