[CHANGE] Redis cache key to a better format

[ppfeufer]

Changed

• Redis cache key to a better format

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (79b1884) to head (e6c615e).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #377   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          346       346           
  Branches        27        27           
=========================================
  Hits           346       346           

Files with missing lines	Coverage Δ
sovtimer/constants.py	100.00% <100.00%> (ø)

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