MX-227: Use ANSI SQL in the Liquibase Scripts

[IOhacker]

Summary by CodeRabbit

Release Notes

• Bug Fixes
  • Enhanced duplicate detection for user role assignments and self-service user account creation to improve data integrity and system reliability.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 127a60e and de31c08.

📒 Files selected for processing (1)

• src/main/resources/db/changelog/tenant/module/selfservice/parts/001-create-selfserviceuser-initial-schema.xml

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📝 Walkthrough

Walkthrough

Database migration file updated to replace PostgreSQL-specific ON CONFLICT DO NOTHING syntax with portable explicit duplicate detection using NOT EXISTS predicates in three insert statements. Table aliases added for clarity. Conflict-handling approach changed across multiple data insertion operations within the self-service user schema initialization.

Changes

Cohort / File(s)	Summary
Database Migration - Conflict Handling Refactor src/main/resources/db/changelog/tenant/module/selfservice/parts/001-create-selfserviceuser-initial-schema.xml	Replaced ON CONFLICT DO NOTHING with explicit AND NOT EXISTS duplicate detection in ss-0001-10 (user role mappings) and ss-0001-12 (self-service users). Added table aliases for source/destination qualification. Removed trailing ON CONFLICT clause from ss-0001-13. Changes improve cross-database compatibility while maintaining deduplication logic.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~50 minutes

Poem

🐰 A migration most cunning and fine,
We banish conflicts, make logic align,
NOT EXISTS now guards each precious row,
No PostgreSQL tricks—just standards we know!
Portable schemas for all hops and springs, 🌱✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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