Operator connection leak

[alexeyklyukin]

Apparently after the 415a7fd when creating users too many idle connections are established per each cluster, each of them corresponding to a single user and doing:

BEGIN ALTER ROLE "vhengst" RESET ALL;ALTER ROLE "vhengst" SET log_statement TO 'all'; END;

It seems that the changes actually triggered the old bug of establishing too many connections (could be that the underlying library is not limiting itself to only one), but the issue was dormant until after another bug, caused by the aforementioned request that changes the log_statement every time it goes the sync happens.

[alexeyklyukin]

Fixed with 1ffe98b