test(database): increase unit test coverage WIP

[sebastijankuzner]

Summary

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.60%. Comparing base (024e4b0) to head (d7698bb).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1204       +/-   ##
============================================
+ Coverage    52.86%   98.60%   +45.74%     
============================================
  Files         1135        3     -1132     
  Lines        62229      430    -61799     
  Branches      1680       77     -1603     
============================================
- Hits         32896      424    -32472     
+ Misses       29179        4    -29175     
+ Partials       154        2      -152     

Flag	Coverage Δ
contracts	98.60% <ø> (?)
packages	?

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