Remove graph related overhead from data storage

[Jens Hedegaard Nielsen (jenshnielsen)]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 67.28972% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.79%. Comparing base (92858ca) to head (41f6b9d).
⚠️ Report is 23 commits behind head on main.

Files with missing lines	Patch %	Lines
src/qcodes/dataset/descriptions/dependencies.py	65.30%	34 Missing ⚠️
src/qcodes/dataset/measurements.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7712      +/-   ##
==========================================
+ Coverage   59.77%   59.79%   +0.01%     
==========================================
  Files         352      352              
  Lines       31688    31788     +100     
==========================================
+ Hits        18942    19007      +65     
- Misses      12746    12781      +35     

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[Copilot]

Pull request overview

This PR introduces performance optimizations to the dataset storage system by creating a frozen, immutable version of InterDependencies_ that caches expensive graph-related lookups. The changes aim to reduce overhead when storing data by avoiding repeated graph traversals.

Key Changes

• Introduced FrozenInterDependencies_ class that wraps InterDependencies_ with immutability and caching of expensive operations
• Extracted _invalid_subsets helper method from validate_subset to enable caching in the frozen implementation
• Modified Measurement.run() to use FrozenInterDependencies_ instead of mutable InterDependencies_

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
src/qcodes/dataset/measurements.py	Updated to wrap interdependencies in FrozenInterDependencies_ when creating a Runner, and added import for the new class
src/qcodes/dataset/descriptions/dependencies.py	Added FrozenInterDependencies_ class with caching for properties and methods, extracted _invalid_subsets helper method, and implemented immutability constraints