[!] add schema migration support for PostgreSQL sinks, closes #1110 - #1111
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- Add `admin.migration` table and migration infrastructure to sink - Implement `Migrate()` and `NeedsMigration()` for `PostgresWriter` and `MultiWriter` - Add migration checks during sink initialization with error messages - Extend `config init/upgrade` commands to support sink migrations - `NewWriterFromPostgresConn` now returns nil writer on errors - Add comprehensive test coverage for migration happy/unhappy paths - Update docs to document sink database migration support Migration pattern follows existing metrics database approach, ensuring both config and sink databases can be upgraded independently using the same `pgwatch config upgrade` command.
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admin.migrationtable and migration infrastructure to sinkMigrate()andNeedsMigration()forPostgresWriterandMultiWriterconfig init/upgradecommands to support sink migrationsNewWriterFromPostgresConnnow returns nil writer on errorsMigration pattern follows existing metrics database approach, ensuring both config and sink databases can be upgraded independently using the same
pgwatch config upgradecommand.