services.postgresql.ensureUsers.*.ensureClauses.replication

Grants the user, created by the ensureUser attr, replication permissions. From the postgres docs:

A role must explicitly be given permission to initiate streaming replication (except for superusers, since those bypass all permission checks). A role used for streaming replication must have LOGIN permission as well. To create such a role, use CREATE ROLE name REPLICATION LOGIN.

More information on postgres roles can be found here

Type
null or boolean
Default

null: do not set. For newly created roles, use PostgreSQL's default. For existing roles, do not touch this clause.

Declared
<nixpkgs/nixos/modules/services/databases/postgresql.nix>