PostgreSQL 18 introduced a powerful new feature that lets you enforce uniqueness across time periods: Temporal Constraints. With this addition, you can now define UNIQUE, PRIMARY KEY, or FOREIGN KEY constraints by either Date Range or Timestamp Range fields, making it easier than ever to prevent overlapping data.

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PostgreSQL 18 introduces temporal constraints with the WITHOUT OVERLAPS syntax, enabling enforcement of uniqueness across time periods using date or timestamp ranges. This feature prevents overlapping data in scenarios like subscription management, where users can have multiple historical records but only one active entry at a time. The implementation uses range types (daterange or timestamprange) with GIST indexes and requires the btree_gist extension for UUID compatibility.

PostgreSQL 18 - Temporal Constraints

Temporal Constraints with WITHOUT OVERLAPS

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<p>I see that new feature very usefull for applying constraints without trigger o logic in the application. Thanks for sharing it!</p>
