This changes the caching mechanism so we cache both current _and_ future
broadcast messages, then manually filter out those we don't want to
display. This ensures we don't need any additional queries while still
being able to display the right messages at the right time.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36661
Caching of BroadcastMessage instances has been changed so a cache stays
valid as long as the default cache expiration time permits, instead of
the cache being expired after 1 minute. When modifying broadcast
messages the cache is flushed automatically.
To remove the need for performing sequence scans on the
"broadcast_messages" table we also add an index on (starts_at, ends_at,
id), permitting PostgreSQL to use an index scan to get all necessary
data.
Finally this commit adds a few NOT NULL constraints to the table to
match the Rails validations.
Fixesgitlab-org/gitlab-ce#31706
In 8278b763d9 the default behaviour of annotation
has changes, which was causing a lot of noise in diffs. We decided in #17382
that it is better to get rid of the whole annotate gem, and instead let people
look at schema.rb for the columns in a table.
Fixes: #17382
