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You can for sure delete Duplicate records, but should not delete OOTB records present on this form as they are used in transformations and job fields.
The variables allow sets of common variable values to be substituted and used when executing transformations and jobs.
Variables are permission-based and substituted at runtime, during the execution.
So deletion of all might cause Malfunction to transformations and jobs.
Please let me know if you and query further on this.