Default roles
An administrator can define a default role to assign to individual users or to the PUBLIC group for a particular database.
The default role is automatically applied when a user establishes a connection with the database.
Each user has whatever privileges are granted to the user individually and the privileges of the default role. A user can switch from the current individual role to the default role by using the SET ROLE DEFAULT statement.
If different default roles are assigned to a user and to PUBLIC, the default role of the user takes precedence. If a default role is not assigned to a user, the user only has individually granted and public privileges.