Tests: Refactor test cases to use generic db helpers

[amotl]

About

A little improvement patch for the test suite to support another one.

References

• CrateDB integration tests #192

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.33%. Comparing base (26cc452) to head (8ae5c43).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
=======================================
  Coverage   54.33%   54.33%           
=======================================
  Files         203      203           
  Lines        9574     9574           
=======================================
  Hits         5202     5202           
  Misses       4372     4372           

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