https://www.postgresql.org/account/comments/new/15/sql-alterdatabase.html/

On Tue, Jan 24, 2023 at 12:43 PM PG Doc comments form <
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Page: https://www.postgresql.org/docs/15/sql-alterdatabase.html
Description:

Would love to see more information about each of the ALTER DATABASE
parameters... a specific... "connlimit"... -1 means no connections, but
what
does 0 mean? Are there users that connect even though the connection limit
is exceeded. Is there special allowances for other database connections, ie
backups?

I would expect superuser roles to ignore all of those options. Everyone
else, not so much. connlimit=0 should have the same effect as
allowcon=false

There is some enhancement at the margins here but unless you are trying to
do unusual stuff it should be working as one would intuitively expect.

David J.