Remove and backup orphaned notes records
#438239 (closed) introduced a non-null constraint to prevent notes records with null
noteable_type
.
The orphaned notes
records with noteable_type=NULL
should be removed then the non-null constraint should be validated.
To locate and delete the orphaned records (there are few records), an index should've been added.
To be safe, create a table (use CREATE TABLE (LIKE notes ...)
) and copy over the orphaned records before deleting them.
Edited by euko