title: How to build model in DynamoDB if each night I need to process the daily records and then delete them?
body: <p>I need to store some daily information in DynamoDB. Basically, I need to store user actions: UserID, StoreID, ActionID and Timestamp.
  Each night I would like to process the information generated that day, do some aggregations, some reports, and then I can safely deleted those records.
  How should I model this? I mean the hash key and the sort key... I need to have the full timestamp of each action for the reports but in order to query DynamoDB I guess it is easier to also save the date only.
  I have some PKs as UserID and StoreID but anyhow I need to process all data each night, not the data related to one user or one store...
  Thanks!
  Patricio</p>