feat(dto): make database-resolved defaults optional in GraphQL inputs

[gazorby]

test: add model and mutation for SQL expression defaults

Description

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

Issues Fixed or Closed by This PR

• Fix bug showed at https://github.com/netbek/strawchemy/commit/b0fcfc4871e349032694cd2af6acbd37e67fe181 (thanks for the finding @netbek!)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 46f10387-b05b-4729-9c95-6d87f2fe7c73

📥 Commits

Reviewing files that changed from the base of the PR and between 6b936da and 7489b23.

⛔ Files ignored due to path filters (1)

• tests/unit/mapping/__snapshots__/test_schemas/test_mutation_schemas[sql_expression_default].gql is excluded by !**/__snapshots__/**

📒 Files selected for processing (7)

• mise.toml
• src/strawchemy/dto/backend/strawberry.py
• src/strawchemy/dto/inspectors/sqlalchemy.py
• src/strawchemy/schema/factories/base.py
• tests/unit/mapping/test_schemas.py
• tests/unit/models.py
• tests/unit/schemas/mutations/sql_expression_default.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sql-expresion-defaults-optional

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[codecov]

Codecov Report

❌ Patch coverage is 83.87097% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.06%. Comparing base (6fd5039) to head (7489b23).
⚠️ Report is 9 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/strawchemy/dto/inspectors/sqlalchemy.py	79.16%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
+ Coverage   92.18%   93.06%   +0.87%     
==========================================
  Files          70       69       -1     
  Lines        6170     6215      +45     
  Branches      816      821       +5     
==========================================
+ Hits         5688     5784      +96     
+ Misses        333      288      -45     
+ Partials      149      143       -6     

☔ View full report in Codecov by Harness.
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[netbek]

@gazorby Thanks for turning my band-aid into a proper fix and for cutting a release. I didn't have time last week to post a minimal reproducible example here and ask what the expected behaviour is. The unit test you added

strawchemy/tests/unit/models.py

Line 225 in 7489b23

created_at: Mapped[datetime] = mapped_column(default=func.now())

demonstrates exactly what I bumped into.