old_contents: class FieldType:
      """ Acts as an enum for field types """
      INTEGER = "INTEGER"
      TEXT = "TEXT"
  
  class FieldConstraint:
      """ Acts a an enum for field constraints """
      NONE = ""
      PRIMARY_KEY = "PRIMARY KEY"
      NOT_NULL = "NOT NULL"
new_contents: class FieldType:
      """ Acts as an enum for field types """
      INTEGER = "INTEGER"
      TEXT = "TEXT"
  
subject: Remove FieldConstraint class (not used)