Small key endpoint related bug fixes

[munrojm]

Small bug fixes related to removing the key endpoints

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (264f03e) 78.40% compared to head (335fec1) 90.15%.
Report is 14 commits behind head on main.

Files	Patch %	Lines
...met/api/routes/materials/thermo/query_operators.py	22.22%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #936       +/-   ##
===========================================
+ Coverage   78.40%   90.15%   +11.75%     
===========================================
  Files          75      138       +63     
  Lines        4292    13159     +8867     
===========================================
+ Hits         3365    11864     +8499     
- Misses        927     1295      +368     

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