Purging data from DynamoDB

The best way to delete data is to utilize the time to live (TTL) feature in dynamoDB. Once enabled at the table level, you specify a field to hold the numeric value to expire the data. This numeric field is the epoch date time. Once this date time is in the past, AWS (within a day or so) will automatically remove this data (at no extra charge). With this in place, you will not need to drop and rebuild the table, but you will need to manage this TTL attribute.

Another option is to use infrastructure as code (such as CDK, CloudFormation templates, etc), to rename this table which will drop and establish a new table.