Mendix native offline mobile app - identifying delta data synchronized from device to be posted to external system

Hi Team, We are building a native offline mobile app. Any changes that user performs on the device once synchronized with the Mendix server database, we would want to identify the latest synchronized changes to be able to post to a target system. Should I go with post commit action to update a flag say “Posted to external system” as No and use the same to filter and retrieve the data to be posted to external system. Are there any better solutions than maintaining a flag? Please let me know. Thanks! 
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