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Use a polite executor for validation tasks

akwizgran requested to merge 675-polite-executor into master

I tested three solutions to this problem:

  • Use a separate executor for validation crypto tasks
  • Use a separate executor for validation crypto and DB tasks
  • Continue to use the existing executors, but add a queue to prevent validation tasks from blocking the crypto executor (this branch)

All the solutions had comparable performance, so I chose the one that didn't involve adding another executor.

This branch also includes a commit that adds logging to the crypto and DB executors and the DB lock to help with performance measurements. Should be useful for #545 (closed).

@grote you've seen most of this before in !485 (closed).

Closes #675 (closed)

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