I was seeing a very strange issue where restores of `mysqldump` backups would fail to correctly restore two specific rows in the `notifications` table, causing the `delivery` column to become corrupted.
After extensive testing spanning multiple days, I found two ways to avoid the problem:
1. This fix, wherein we limit the number of rows in each `INSERT`.
2. Deleting the `SET FOREIGN_KEY_CHECKS=0` line that gets automatically inserted at the top of the backup file by `mysqldump`.
I can't tell why the second option works and there's no way to configure `mysqldump` to prevent it from spitting out that line. We can remove it after-the-fact but that would be more work.
On the other hand, this solution is simple and "just works".
Depends on D4641