A couple of admin nice-to-have's based on the last few weeks of 24x7
operation are:
Allow DBA/Database Owner to log in even when max_connections has been
reached so they can determine which queries are hung via
pg_stat_activity etc. and perform any other needed work to restore
stability.
Log offending query during DEBUG logging for syntax errors, missing
tables/attributes, etc. so that the offending queries can be located in
the codebase.
ss