Package-level declarations

The analytics catalog context: one service, centrally managed, holds the warehouse's data sources and, built on them, the wide tables a dataset serves. Its source aggregate is one physical table or view of the warehouse, identified by (connection, database, table) (sourceIdOf): a table the Wow ClickHouse Sink keeps, described by its trusted wow_catalog row, or a table an analyst provides, drafted from system.columns and reviewed. Its dataset aggregate is a wide table over the sources (-2), identified by the name queries read it by (datasetIdOf).