Issue #16 indicates a problem where a sensor's data time stamp has become out-of-sync with real time. One improvement that could be made here would be to add some validation to the DB data insertion process, either at the sensor end or at the database (I don't know what the architecture of this system is) to check sensor time against a trusted (network) time source. Inconsistencies between the sensor's clock and the time source could be caught and would prevent data with an incorrect timestamp being inserted into the database.
Issue #16 indicates a problem where a sensor's data time stamp has become out-of-sync with real time. One improvement that could be made here would be to add some validation to the DB data insertion process, either at the sensor end or at the database (I don't know what the architecture of this system is) to check sensor time against a trusted (network) time source. Inconsistencies between the sensor's clock and the time source could be caught and would prevent data with an incorrect timestamp being inserted into the database.