- Add 'postgresql' to DatabaseType union in database.types.ts
- Add PostgreSqlConfig interface extending DatabaseConfig
- Add postgresqlConfigSchema Zod schema with host, port, database,
username, password, and maxPoolSize fields
- Add 'postgresql' to databaseConfigSchema and type exports
- Create SqlDialect interface with methods for quoteTableName,
param, params, currentTimestamp, upsert, paginate, maxBatchRows
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>