objects: one table per object, named by its slug. This is the default schema, soSELECT … FROM companiesresolves toobjects.companies.lists: one table per list, named by its slug. Each row is a list entry.activities: one table per activity, named by its slug. Each row is an activity record, e.g.activities.phone_calls.
Discovering the schema
Two introspection schemas are available:information_schema and a Postgres-compatible pg_catalog, so standard SQL tooling can discover tables and columns.
These describe the schema, not your CRM data.