David Mudrák c5944a1d57 MDL-64553 message: Add index for the notifications.useridfrom field
The useridfrom would normally be a foreign key to the users table. But
it can also contain some extra negative values with special semantics
(-10 or -20 for no-reply or support user). Therefore we can't make it a
foreign key and the index must be created explicitly.
2019-01-21 12:57:11 +01:00
..
2019-01-16 12:14:25 +08:00