Allow appending SQL comments via DD_DBM_ALWAYS_APPEND_SQL_COMMENT

[bwoebi]

Modeled after DataDog/dd-trace-java#9798.

Fixes #3951.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Insert appended comments before a trailing semicolon

When append mode is enabled, semicolon-terminated queries such as SELECT 1; are rewritten as SELECT 1; /*dd...*/. In contexts that treat ; as the statement boundary, the DBM comment is no longer attached to the statement and can be parsed as a separate empty/comment-only statement, which can break execution or lose correlation for the exact queries this new append mode affects. Please place the comment before a final statement terminator instead of always concatenating it after the whole query.

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[datadog-official]

 

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🚦 37 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-php | ASAN test_c with multiple observers: [8.3]     

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Fatal error: Uncaught Exception: wait for replay timeout in /go/src/github.com/DataDog/apm-reliability/dd-trace-php/tmp/build_extension/tests/ext/includes/request_replayer.inc:100

DataDog/apm-reliability/dd-trace-php | benchmarks-tracer     

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DataDog/apm-reliability/dd-trace-php | test_extension_ci: [7.0]     

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Failed to execute tests due to missing executables '/go/src/github.com/DataDog/apm-reliability/dd-trace-php/libtool' and '/go/src/github.com/DataDog/apm-reliability/dd-trace-php/tmp/build_extension/build/shtool'.

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🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 54.12% (+0.00%)

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