- Sets session ID to be a constant-sized character field inline in the
table instead of a variable-length character field compressed outside
of the row.
- Changes the session data from "json" to "jsonb" which is faster and
smaller on disk with the drawback of not maintaining key order and
whitespace (which we don't care about at all)
- Adds a clustered index on the session expiration timestamp, which will
make periodic session purging much faster.
(For an example, WTDWTF currently has 482355 sessions in the table, and
because there is no index on the expiration timestamp, PostgreSQL must
check all the rows in the table every time.)
This upgrade script can run concurrently with a live NodeBB instance,
but any action that touches sessions will wait until the upgrade script
is done.
Does not touch the database if the database driver is not set to
PostgreSQL or if there is a Redis database configured.
Peter Jaszkowiak
renovate[bot]
Ben Lubar