New #868: Add SerializationFailureException

[KalimeroMK]

Fix#868

Adds SerializationFailureException for SQLSTATE code 40001 (serialization failure, e.g. transaction deadlock in concurrent updates). The code is the same for all databases, so the conversion is done centrally in ConvertException, next to the existing IntegrityException mapping.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.62%. Comparing base (f0b0d2b) to head (99d6356).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #1196 +/- ##
=========================================
Coverage 98.62% 98.62% - Complexity 1645 1646 +1 
=========================================
Files 120 120 Lines 4288 4290 +2 =========================================
+ Hits 4229 4231 +2 
Misses 59 59 

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[Copilot]

Pull request overview

Adds a database exception for SQLSTATE 40001 serialization failures.

Changes:

• Adds SerializationFailureException.
• Maps SQLSTATE 40001 centrally and adds a test.
• Updates the changelog.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/Exception/SerializationFailureException.php	Defines the new exception type.
src/Exception/ConvertException.php	Converts matching failures to the new type.
tests/Db/Exception/ConvertExceptionTest.php	Tests serialization-failure conversion.
CHANGELOG.md	Documents the feature.

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[vjik]

Are there cases when ($errorInfo[0] ?? null) === '40001' is not enough?

[zoranbogoevskimkd]

in real usage PDO always populates errorInfo, so the message fallback only served manually constructed exceptions I Removed it so the check now relies solely on $errorInfo[0] and the test sets errorInfo the way PDO would.