Limit number of keys to process simultaneously #92
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We've found that the unprocessed keys table can fill up fairly fast (depending on activity), and the unprocessed batch key handler selects all keys in that table every time it processes them.
In a production environment, we found the unprocessed table >15k keys, and the processor tries to insert all of them at once, failing due to timeout, and not accumulating resolved data.
This PR adds a limit (of 100) to the unprocessed sql query. This allows the synchronization to proceed as expected.