old_contents: 
  from django.db import connection
  from south.db import generic
  
  class DatabaseOperations(generic.DatabaseOperations):
  
      """
      SQLite3 implementation of database operations.
      """
  
      # SQLite ignores foreign key constraints. I wish I could.
      supports_foreign_keys = False
      
      # You can't add UNIQUE columns with an ALTER TABLE.
      def add_column(self, table_name, name, field, *args, **kwds):
          # Run ALTER TABLE with no unique column
          unique, field._unique, field.db_index = field.unique, False, False
          # If it's not nullable, and has no default, raise an error (SQLite is picky)
          if not field.null and (not field.has_default() or field.get_default() is None):
              raise ValueError("You cannot add a null=False column without a default value.")
          generic.DatabaseOperations.add_column(self, table_name, name, field, *args, **kwds)
          # If it _was_ unique, make an index on it.
          if unique:
              self.create_index(table_name, [name], unique=True)
      
      # SQLite doesn't have ALTER COLUMN
      def alter_column(self, table_name, name, field, explicit_name=True):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support altering columns.")
      
      # Nor DROP COLUMN
      def delete_column(self, table_name, name):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support deleting columns.")
      
      # Nor RENAME COLUMN
      def rename_column(self, table_name, old, new):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support renaming columns.")
      
      # Nor unique creation
      def create_unique(self, table_name, columns):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support adding unique constraints.")
      
      # Nor unique deletion
      def delete_unique(self, table_name, columns):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support removing unique constraints.")
      
      # No cascades on deletes
      def delete_table(self, table_name, cascade=True):
          generic.DatabaseOperations.delete_table(self, table_name, False)
      
new_contents: 
  from django.db import connection
  from south.db import generic
  
  class DatabaseOperations(generic.DatabaseOperations):
  
      """
      SQLite3 implementation of database operations.
      """
  
      # SQLite ignores foreign key constraints. I wish I could.
      supports_foreign_keys = False
      
      # You can't add UNIQUE columns with an ALTER TABLE.
      def add_column(self, table_name, name, field, *args, **kwds):
          # Run ALTER TABLE with no unique column
          unique, field._unique, field.db_index = field.unique, False, False
          # If it's not nullable, and has no default, raise an error (SQLite is picky)
          if not field.null and (not field.has_default() or field.get_default() is None):
              raise ValueError("You cannot add a null=False column without a default value.")
          generic.DatabaseOperations.add_column(self, table_name, name, field, *args, **kwds)
          # If it _was_ unique, make an index on it.
          if unique:
              self.create_index(table_name, [name], unique=True)
      
      # SQLite doesn't have ALTER COLUMN
      def alter_column(self, table_name, name, field, explicit_name=True):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support altering columns.")
      
      # Nor DROP COLUMN
      def delete_column(self, table_name, name):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support deleting columns.")
      
      # Nor RENAME COLUMN
      def rename_column(self, table_name, old, new):
          """
          Not supported under SQLite.
          """
          raise NotImplementedError("SQLite does not support renaming columns.")
      
      # Nor unique creation
      def create_unique(self, table_name, columns):
          """
          Not supported under SQLite.
          """
          print "WARNING: SQLite does not support adding unique constraints. Ignored."
      
      # Nor unique deletion
      def delete_unique(self, table_name, columns):
          """
          Not supported under SQLite.
          """
          print "WARNING: SQLite does not support removing unique constraints. Ignored."
      
      # No cascades on deletes
      def delete_table(self, table_name, cascade=True):
          generic.DatabaseOperations.delete_table(self, table_name, False)
      
subject: Downgrade those from errors to warnings.