Added knex integration tests for dates inc relative

[ErisDS]

• This adds missing test coverage for dates and relative dates, showing this results in correct queries against the db

[codecov-commenter]

Codecov Report

Merging #25 (8afbab6) into main (99c7f94) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   80.42%   80.42%           
=======================================
  Files           9        9           
  Lines        1548     1548           
  Branches      289      289           
=======================================
  Hits         1245     1245           
  Misses        299      299           
  Partials        4        4           

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