• Nick Thomas's avatar
    Allow external diffs to be used conditionally · 0e831b0b
    Nick Thomas authored
    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    outdated through user actions.
    0e831b0b