Flyway V4 Script (Removing invalid ApplicationInformation extensions) causes MySQL issues

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The Flyway V4 script applies to all DB vendors. Rather than creating custom V4 scripts for each vendor, remove the extension columns from the V1 __Create_Base_Tables.sql script

[dfcoffin]

Resolved by PR #42. Added TestContainers integration tests for MySQL and PostgreSQL with proper database version alignment and Flyway migration cleanup.