def downgrade():
op.execute(drop_func_process_user_login)
op.execute(drop_func_get_elligible_user_message_pairs)
op.execute(drop_func_update_user_message_last_time_sent)
op.execute(drop_func_get_and_update_messages_to_send)
op.execute(drop_func_get_localized_message)
op.execute(drop_func_add_message)
op.drop_table('user_message_last_time_sent')
op.drop_table('message_localization')
op.drop_index(op.f('idx_device_login_id'), table_name='device')
op.drop_table('device')
op.drop_table('message')
op.drop_table('login')
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