code: def __repr__(self):
      return f"<SqlMetric({self.key}, {self.value}, {self.timestamp})>"
  
file_path: mlflow/mlflow/store/tracking/dbmodels/initial_models.py
imports: import time
  from sqlalchemy import BigInteger, CheckConstraint, Column, Float, ForeignKey, Integer, PrimaryKeyConstraint, String
  from sqlalchemy.orm import backref, declarative_base, relationship
label_desc: Use image node_id 1 for calling the SqlMetric obj's underlying member method code with example usage: obj.__repr__() and returns: str, self, str, self, str, self, str