Mateusz Mandera 93e18fe289 migrations: Remove disallowed characters from topics. ...

Following b3c58f454f, we want to clean up
old topics that may contain the disallowed characters. The Message table
is large, so we go in batches, making sure we limit topic fetches and
UPDATE query to no more than BATCH_SIZE Message rows per query.

2021-12-09 09:51:06 -08:00

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