add migration to fix concatenated subjects (part 2) DONT MERGE YET #1630
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Context
In the first part of this data clean up we created a new column
deconcatenated_subject
and copied all subjects here, cleaning up the ones we've identified.Now we want to replace the subjects column with these values.
#1449 #1627
What's New
We remove the subject column and rename
deconcatenated_subject
tosubject
. Also clean up the ERA_subjects_issue.txt file and reference in the previous migration.