Root cause: fetch_available_datasources did not return database_id,
so frontend could not auto-set target_database_id when user selected
a datasource. User then had to manually pick a database on Target Config
tab — and could accidentally select the wrong one.
Backend changes:
- Add 'database_id' field to datasources response (from db_info.get('id'))
- Add _database_name tracking in SupersetSqlLabExecutor with getter
- Add database_name + database_backend to TargetSchemaValidationResponse
- Enrich resolve_database_id logging with database_name and all_keys
Frontend changes:
- In selectDatasource(), auto-set targetDatabaseId from ds.database_id
when present, so the correct target DB is used for schema checks.