Description of changes:
Create createdAt at DispatchResoruce's assign-drivers handler and pass it to dispatcher to avoid creating duplicated assignment entries.
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Issue #, if available:
Description of changes: Create
createdAtatDispatchResoruce'sassign-drivershandler and pass it to dispatcher to avoid creating duplicated assignment entries.By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.