id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
26712	Avoid unnecessary SET TIMEZONE queries on PostgreSQL when no changes are required	Simon Charette	nobody	"The `setting_changed` receiver for the `TIME_ZONE` and `USE_TZ` settings inconditionally resets each connections timezones on every change even if not required. This is not an issue for all backends except PostgreSQL where a query needs to be performed.

Whether or not actions must me performed on `TIME_ZONE` and `USE_TZ` change should be delegated to the backend specific connection and signal receivers should only have to clear possibly stale cached values.

"	Cleanup/optimization	closed	Database layer (models, ORM)	dev	Normal	fixed			Ready for checkin	1	0	0	0	0	0