Update DB access and queue handling #449
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no, I think it makes sense to switch to postgres, and if that goes in first, we can modify this PR to remove the atomic DB operations. I just wanted to submit this so we didn't lose track of the changes needed to fix the queue problems. |
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Makes saves to the database atomic operations, updates the model runners to pause consumption of messages from the run queue while a simulation is running, and removes the thread pool for model runners.