feat: add scalar relations

[raphasampaio]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 62.16216% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.32%. Comparing base (d9eff8d) to head (ce246d7).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/database.cpp	40.00%	27 Missing ⚠️
src/c_api_database.cpp	0.00%	23 Missing ⚠️
bindings/dart/lib/src/database.dart	90.62%	3 Missing ⚠️
bindings/julia/src/database.jl	87.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   78.12%   77.32%   -0.81%     
==========================================
  Files          31       31              
  Lines        2780     2928     +148     
  Branches      255      270      +15     
==========================================
+ Hits         2172     2264      +92     
- Misses        607      663      +56     
  Partials        1        1              

Flag	Coverage Δ
cpp	82.37% <44.44%> (-1.62%)	⬇️
dart	68.32% <90.62%> (+2.03%)	⬆️
julia	55.07% <88.46%> (+2.72%)	⬆️

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Files with missing lines	Coverage Δ
bindings/julia/src/c_api.jl	33.33% <100.00%> (+1.82%)	⬆️
tests/test_database.cpp	100.00% <100.00%> (ø)
bindings/dart/lib/src/database.dart	68.77% <90.62%> (+3.69%)	⬆️
bindings/julia/src/database.jl	62.20% <87.50%> (+3.28%)	⬆️
src/c_api_database.cpp	56.74% <0.00%> (-5.70%)	⬇️
src/database.cpp	70.00% <40.00%> (-2.73%)	⬇️

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