Make `traversal_ids` column nullable if it's already not
What does this MR do and why?
With this change, we will make the traversal_ids
column of the vulnerability_reads
table nullable if it's already not. This can happen if an installation has already run the migration introduced by Change column null for `traversal_ids` of the `... (!146800 - merged) which is no-opped by Make the recently added not null migration no-op (!147264 - merged).
Edited by Mehmet Emin INAC