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This section introduces temporal tables, with a focus on Application Time (which we support) and only a brief mention of System Time (which we don't). It covers temporal primary keys, unique constraints, and temporal foreign keys. We will document temporal update/delete and periods as we add those features. This commit also adds glossary entries for temporal table, application time, and system time. Author: Paul A. Jungwirth <pj@illuminatedcomputing.com> Discussion: https://www.postgresql.org/message-id/flat/ec498c3d-5f2b-48ec-b989-5561c8aa2024@illuminatedcomputing.com