Allows tags to optionally be owned by a partner which only they can use. Implementation notes: * either the tags table will need a new column, or a new table that associates tags with partners (to allow many:many) will be needed * adding tags to items will need to go through a stored procedure to ensure that the tags used are valid. sth like: setTags(assetId, tagIds, person) and addTags(assetId, tagIds, person) Reproducible: Always