{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does a blockchain database implement the destruction of database objects?","a":"Set destruction conditions: According to business requirements and data characteristics, set the destruction conditions of data objects. For example, when the deadline of a data object reaches, or its mission is completed,  or a new data object replaces it, etc."}]}],"pr":"2fdb119eaa42890f1fb86a68d5be896c43f34a0716d945f2ddfb42803b81ad3e"}