Hello,
I cannot find anything on how to purge the update manager database. I am using SQL express for this right now and needed to purge data myself. Below is a SQL script i used while logged into the Update manager database. I have have not had any issues since running it. I basically deleted all entries that have Microsoft in the name. If you do this i suggest backing up the database first.
The below script will delete 30000 rows at a time so if you have simple loggin enabled you will not grow your transaction logs by much.
WHILE (2 > 1)
BEGIN
DELETE top (30000) FROM VCI_PACKAGE_LOCALES
where DOWNLOADURL like '%microsoft%'
IF @@ROWCOUNT = 0 -- no more to delete
BREAK;
-- 1 second delay loop to allow other processes to "jump in"
WAITFOR delay '00:00:01'
END
GO