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Author SHA1 Message Date
Nick Thomas
0e831b0b69
Allow external diffs to be used conditionally
Since external diffs are likely to be a bit slower than in-database
ones, add a mode that makes diffs external after they've been obsoleted
by events. This should strike a balance between performance and disk
space.

A background cron drives the majority of migrations, since diffs become
outdated through user actions.
2019-03-27 16:51:33 +00:00