Tim Abbott a3a9adbfa9 edit_history: Stop writing prev_subject to the database. ...

Now that we have code to support reading prev_topic, this is no longer
necessary.

We'll want to deploy this change to production before running the
migration to remove prev_subject from edit history entries, so that
prev_subject can be fully purged from the database.

2022-03-04 10:25:48 -08:00

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