4

I tried to implement repeated execution of particular action and set this param as _self of calling contract, but the transaction gets executed only once in this case. Then i tried to set it as time() and it worked, so has it to be unique?

5

The sender_id is just a value set by the contract that sends the deferred transaction so that later operations can refer to the same transaction. The semantics are:

  • sending a new transaction with the same sender_id as one in-flight will replace the in-flight transaction
  • canceling a transaction can be achieved by passing that sender_id into cancel_deferred

So, if you want to have N transactions in-flight at the same time they need N unique ID's

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