What is the condition for preserving every data entry per ID?

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The condition for preserving every data entry per ID is to ensure that each data entry is uniquely identifiable by a specific ID and the system or database is designed to retain and store all data entries associated with that ID without any duplication or loss of information. Additionally, proper data management processes, including regular backups, should be in place to prevent data loss due to technical failures or other unforeseen events.