How is the Postgres 'system database' attribute set or unset?

One of several databases in a Postgres 10.15 cluster has been set to be a system database. The mechanism that caused this is unknown, though it may have happened at the same time that the database was converted to a template by updating the pg_database table. The pg_database table does not have a setting to control whether or not a database is a system database, however, and I cannot find any documentation describing how to set (or unset, which is what I really want to do) the system database flag.

https://stackoverflow.com/questions/67292190/how-is-the-postgres-system-database-attribute-set-or-unset April 28, 2021 at 08:21AM