* MM-46410: adds urgency on mention counts We have introduced priority for posts in https://github.com/mattermost/mattermost-webapp/pull/10951. We do need to color the mention badges in the webapp with a prominent color when a mention is posted in an urgent message. A thread has urgent mentions if the root post is marked as urgent, and the replies contain mentions to the user viewing the thread. This PR adds a column, urgentmentioncount, in channelmembers. Furthermore when asking for team/thread mention counts, we also return urgent mention counts for the user. Adds a new table to hold posts priorities Refactors priority out of the props and into the new table We are nilifying Metadata when post.ForPlugin(), which didn't save Priority for a post when Boards was enabled. This commit copies metadata again to the post, so metadata are reinstated. Co-authored-by: Mattermod <mattermod@users.noreply.github.com> Co-authored-by: Vishal Choudhary <vish9812@gmail.com>
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