All Rules

Validates that email columns match standard email format

Ensures a column has no null or empty values

Ensures all FK values exist in the parent reference table

Validates that date/timestamp values are not in the future

Ensures all values in a column are unique with no duplicates

Verifies table has been updated within expected time window

Ensures table has at least N rows — catches empty or truncated loads

Validates that the mean of a numeric column falls within expected bounds