Add PostgreSQL backend scaffolding#428
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Support MySQL SHOW COLLATION and SHOW DATABASES/SCHEMAS in the PostgreSQL driver using tokenized statement parsing and static MySQL-shaped result rows.
Add MySQL-compatible savepoint handling, including fail-closed handling for unsupported savepoint syntax before raw backend execution. Add scoped PostgreSQL TRUNCATE support and main database-qualified simple table targets. Keep unsupported extra-qualified CREATE TABLE targets fail-closed before DDL translation.
Add standalone CREATE/DROP INDEX support, including fail-closed handling for unsupported forms. Support main database-qualified DROP TABLE and database qualifiers for SHOW TABLES and SHOW INDEX/INDEXES/KEYS.
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Summary
This PR adds PostgreSQL backend support to the SQLite Database Integration test infrastructure and makes the full WordPress PHPUnit suite practical to run in CI.
Passes the full WordPress unit test suite.
Validation
This was validated with package-level PostgreSQL PHPUnit coverage, focused WordPress PostgreSQL regressions, repeated full unfiltered local WordPress PostgreSQL runs, code review on the performance-sensitive paths, and final hosted GitHub Actions verification.
WordPress PHPUnit: SQLite 24,648 passed; PostgreSQL 24,628 passed
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