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simulator: stop using the database as a cache for origin data

vlorentz requested to merge generated-differential-D4914-source into generated-differential-D4914-target

This was a significant bottleneck of the simulator. To work around this, we:

  • Generate snapshot ids consistently in the OriginModel
  • Cache the origin data locally in the simulator, to compute the eventfulness of visits
  • Cache the last visit time for all origins to compute the estimated run time of visit tasks.

Migrated from D4914 (view on Phabricator)

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