Fix down migration in media update; add a temp index for performance.
Fix down migration in media update; add a temp index for performance.


SlvrEagle23/AzuraCast,SlvrEagle23/AzuraCast,AzuraCast/AzuraCast,SlvrEagle23/AzuraCast,AzuraCast/AzuraCast,SlvrEagle23/AzuraCast,AzuraCast/AzuraCast,SlvrEagle23/AzuraCast,AzuraCast/AzuraCast