In PostgreSQL 15+ You can create an index in which NULL values can be duplicated.

Here is an example of creating the index:

CREATE UNIQUE INDEX ON untitled_table2(created_at) NULLS NOT DISTINCT ;

Beekeeper doesn't show this detail in the structure tab, instead just shows it as a unique index

This should probably be displayed in an 'extras' column, or something similar to how we handle MYSQL Extras

More details:

• https://stackoverflow.com/questions/8289100/create-unique-constraint-with-null-columns
• https://www.postgresql.org/docs/15/release-15.html#id-1.11.6.5.5.3.4