#1452 - Cannot add or update a child row: a foreign key constraint fails (`Appian`.`#sql-alter-34ce-15086d9`, CONSTRAINT `tems_stability_ranges_ibfk_2` FOREIGN KEY (`budget_id`) REFERENCES `tems_etem_log_excursion` (`budget_id`))

#1452 - Cannot add or update a child row: a foreign key constraint fails (`Appian`.`#sql-alter-34ce-15086d9`, CONSTRAINT `table1_ibfk_2` FOREIGN KEY (`first_id`) REFERENCES `table2` (`first_id`))

What does this error mean?

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