Add an express cache for graphql

[codecov[bot]]

Codecov Report

Merging #1249 (521b4b3) into master (7f68e1d) will decrease coverage by 0.20%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1249      +/-   ##
==========================================
- Coverage   66.43%   66.24%   -0.20%     
==========================================
  Files         144      145       +1     
  Lines        6042     6079      +37     
  Branches     1434     1439       +5     
==========================================
+ Hits         4014     4027      +13     
- Misses       1889     1911      +22     
- Partials      139      141       +2     

Flag	Coverage Δ
backend	66.24% <ø> (-0.20%)	:arrow_down:

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see 2 files with indirect coverage changes

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