Refactor/2026 02 query sanitizer

[takapi327]

Implementation Details

QuerySanitizer.scala - Modification of Regular Expression Patterns:

Pattern	Before	After
STRING_LITERAL_PATTERN	'(?:[^'\\]|\\.)*'	'(?:[^'\\]|\\.|'')*'
DOUBLE_QUOTED_PATTERN	"(?:[^"\\]|\\.)*"	"(?:[^"\\]|\\.|"")*"

• Correctly recognizes MySQL's '' escape method (e.g., 'It''s a test') as a single literal
• Similarly supports the "" escape method (double-quote version)

QuerySanitizerTest.scala - Added 16 tests:

Category	Number of tests	Content
ReDoS Resistance Test	11	Confirmation of processing completion for malicious input against each regular expression pattern
MySQL '' Escape	3	Basic, multiple times, empty string cases
MAX_QUERY_LENGTH Boundary	2	Operation verification near the upper limit

Fixes

Fixes #xxxxx

Pull Request Checklist

• Wrote unit and integration tests
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code formatting by scalafmt (sbt scalafmtAll command execution)
• Add copyright headers to new files

References