Set index frequency on high and low data after loading

[jessegrabowski]

Closes #14

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.88%. Comparing base (13f9a25) to head (8b77d65).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   63.54%   64.88%   +1.33%     
==========================================
  Files           4        4              
  Lines         727      729       +2     
==========================================
+ Hits          462      473      +11     
+ Misses        265      256       -9     

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