Timestamp in asset/attributes endpoint

Hello,
We have implemented OpenRemote to receive data from agricultural sensors, create dashboards and analyze them. The sensors transmit the data to a Gateway that adds a timestamp and stores it in a temporary database, every 15 minutes it reads the temporary database and sends it to OpenRemote through the /asset/attributes endpoint. Because the crops are located in areas with difficult communication, the Gateway normally cannot communicate 100% of the time and once it recovers communication it sends all the accumulated data.
Is there a way for the data to retain its original timestamp and not be plotted with the date and time it was received by OpenRemote?
We greatly appreciate your help.

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