# Deleting field 'Button.key_mod'
db.delete_column('toolbar_button', 'key_mod')
# Changing field 'Button.key'
db.alter_column('toolbar_button', 'key', self.gf('django.db.models.fields.CharField')(max_length=1, null=True))
# Deleting field 'Button.key_mod'
db.delete_column('toolbar_button', 'key_mod')
# Changing field 'Button.key'
db.alter_column('toolbar_button', 'key', self.gf('django.db.models.fields.CharField')(max_length=1, null=True))