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============================
Remove SQL Schema Downgrades
============================

.. If section numbers are desired, unindent this
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    .. contents::

Trove still has the downgrade method on its migration files. Following the
cross-project spec https://review.openstack.org/#/c/152337/ we are supposed to
remove the downgrade to avoid data inconsistency, lack of integrity, etc.
This approach was already done in many projects like Keystone, Magnum, Nova
and others [2][3][4][5].

Launchpad Blueprint:
https://blueprints.launchpad.net/trove/+spec/remove-sql-schema-downgrades


Problem Description
===================

Downgrades are not the best idea when thinking about data integrity. A cross
project spec was proposed to start removing downgrades and it was already done
in many projects. We need to delete downgrade from migration files.

Proposed Change
===============

Remove downgrades from migration files and remove the command from
trove-manage.

Configuration
-------------

None

Database
--------

None

Public API
----------

None

Public API Security
-------------------

None

Python API
----------

None

CLI (python-troveclient)
------------------------

None

Internal API
------------

None

Guest Agent
-----------

None

Alternatives
------------

None


Dashboard Impact (UX)
=====================

TBD (section added after approval)


Implementation
==============

Assignee(s)
-----------

<tellesmvn>

Milestones
----------

Mitaka-1

Work Items
----------

This work is basically removing downgrades, removing the command from
trove-manage and update the tests.

Upgrade Implications
====================

None


Dependencies
============

None


Testing
=======

We need to update the tests so they will not fail when trying to downgrade.


Documentation Impact
====================

None

References
==========

* https://review.openstack.org/#/c/152337/
* https://review.openstack.org/#/c/167554/2
* https://review.openstack.org/#/c/167834/
* https://review.openstack.org/#/c/167189/2
* https://review.openstack.org/#/c/165740/


Appendix
========

None