Refactoring #281

[yfukai]

This is an attempt to refactor #281 on the current main. I updated the code to merge overlapping functions.

Original context:

I got the same error as #249 when I did graph.filter(node_ids=node_ids), and this is intended to solve the issue.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.25287% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.81%. Comparing base (a4f7607) to head (0cfec4d).

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_sql_graph.py	94.25%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
+ Coverage   87.75%   87.81%   +0.06%     
==========================================
  Files          57       57              
  Lines        4947     4998      +51     
  Branches      872      877       +5     
==========================================
+ Hits         4341     4389      +48     
- Misses        381      384       +3     
  Partials      225      225              

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[yfukai]

I think this is ready! @JoOkuma