release v2.3.0

[methane]

This pull request prepares for the 2.3.0 release by updating the version information and adding detailed release notes. The release introduces several new features, improvements, and deprecations to the MySQLdb package.

Release preparation:

• Updated the version number to 2.3.0 in src/MySQLdb/release.py.
• Added a new section in HISTORY.rst describing the changes in 2.3.0, including new features, bug fixes, and deprecations.

Key highlights from the release notes:

Thread Safety and Concurrency:

• Concurrent use of the same Connection object from multiple threads now raises ProgrammingError immediately, preventing undefined behavior.

Performance and Feature Enhancements:

• Added an optional executemany_fallback="multi" connection option to batch certain statements in Cursor.executemany() for improved performance.
• Made Cursor an iterator as specified by DB-API 2.0, and added Cursor.warning_count and Connection.more_results() for better API compliance and usability.

Deprecations:

• Deprecated accessing exception classes as Cursor attributes and the reconnect parameter of Connection.ping().

Summary by CodeRabbit

• New Features

  • Added cursor iteration and warning-count access.
  • Added support for processing additional result sets.
  • Added configurable batched executemany() behavior.
  • Added Windows ARM64 wheel support.

• Bug Fixes

  • Concurrent use of a connection now raises ProgrammingError immediately.
  • Improved procedure-call quoting and corrected timedelta conversion.

• Compatibility

  • Added testing support for Python 3.15 and free-threaded Python.
  • Updated MariaDB Connector/C support.

• Deprecations

  • Cursor-level exception attributes and the reconnect parameter of Connection.ping() are deprecated.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.71%. Comparing base (e2a908b) to head (9545807).
⚠️ Report is 53 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #799      +/-   ##
==========================================
+ Coverage   88.86%   91.71%   +2.84%     
==========================================
  Files           7        7              
  Lines         548      676     +128     
==========================================
+ Hits          487      620     +133     
+ Misses         61       56       -5     

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 8cce9bf9-d8a0-49dc-af46-a0b009b3e8de

📥 Commits

Reviewing files that changed from the base of the PR and between 382a198 and 9545807.

📒 Files selected for processing (1)

• HISTORY.rst

🚧 Files skipped from review as they are similar to previous changes (1)

• HISTORY.rst

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📝 Walkthrough

Walkthrough

The release updates package version metadata from 2.2.8 to 2.3.0 and adds release notes covering connection behavior, cursor APIs, conversion fixes, platform support, testing, new methods, and deprecations.

Changes

2.3.0 release

Layer / File(s)	Summary
Publish 2.3.0 release src/MySQLdb/release.py, HISTORY.rst	The package version changes to 2.3.0. The release notes document concurrent connection errors, executemany() fallback configuration, cursor iteration and warnings, conversion and quoting fixes, platform and test updates, Connection.more_results(), and deprecations.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to 95458

The package version and 2.3.0 release notes are updated with no remaining identified merge-readiness risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: preparing the 2.3.0 release. It is concise and related to the version update and release notes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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