Fix migration

migrations/versions/c1d7ddb101a1_add_code.py

@@ -24,9 +24,7 @@ def upgrade():
     sa.PrimaryKeyConstraint('id', name=op.f('pk_code')),
     sa.UniqueConstraint('secret', name=op.f('uq_code_secret'))
     )
-    op.drop_constraint('user_email_key', 'user', type_='unique')
 
 
 def downgrade():
-    op.create_unique_constraint('user_email_key', 'user', ['email'])
     op.drop_table('code')