FIX: CI by adding duckdb

[RBhupi]

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• docs-only
• tests-only
• tiny-change (<5 lines, single class/file)
• code-change
• scientific/algorithmic
• design/architecture
• GUI

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.53%. Comparing base (5a6c0eb) to head (001dcc5).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #60       +/-   ##
===========================================
+ Coverage   58.79%   84.53%   +25.73%     
===========================================
  Files          71       82       +11     
  Lines        6594     5637      -957     
  Branches      952      783      -169     
===========================================
+ Hits         3877     4765      +888     
+ Misses       2491      614     -1877     
- Partials      226      258       +32     

Flag	Coverage Δ
unittests	84.53% <ø> (+25.73%)	⬆️

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