Add PostgreSQL migrations#55
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Each existing MySQL migration now has a corresponding PostgreSQL counterpart extending AbstractPostgreSQLMigration. The PostgreSQL versions use platform-appropriate SQL syntax (SERIAL, TIMESTAMP, ALTER INDEX, DROP CONSTRAINT, etc.).
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Adds PostgreSQL migration counterparts for all 8 existing MySQL-only migrations. Each PostgreSQL migration extends
AbstractPostgreSQLMigration(which skips execution on MySQL) and uses PostgreSQL-appropriate SQL syntax:SERIALfor auto-increment,TIMESTAMP(0) WITHOUT TIME ZONEfor datetime,ALTER INDEX ... RENAME TOinstead ofALTER TABLE ... RENAME INDEX,DROP CONSTRAINTinstead ofDROP FOREIGN KEY, and separateCREATE INDEXstatements instead of inline index definitions.