Turned out I have django_evolution version updated somehow. Rolling back to 
the previous version worked.

On Tuesday, December 8, 2015 at 4:42:50 PM UTC-8, Kevin Yin wrote:
>
> So I got this reviewboard 1.7.12 server assigned to me. We have the need 
> for some new features from newer versions of reviewboard. So I simply did 
> easy_install -U ReviewBoard and rb-site upgrade. It failed. I did not have 
> a recent backup, but luckily rolling back the ReviewBoard python package 
> version worked. So I read a bunch of discussions here. I decided to upgrade 
> to 1.7.28 first. But it fails too, with following error same as 
> https://groups.google.com/forum/#!searchin/reviewboard/Downgrading$20Reviewboard$202.0RC2%7Csort:relevance/reviewboard/pxQ3eyYPhzE/PxEj_0_Oi9YJ
> :
>
> ------------------ <begin log output> ------------------
> Creating tables ...
>
> [!] Unable to execute the manager command syncdb: No module named
>     db.fields
>
> [!] Unable to execute the manager command evolve: No module named
>     db.fields
> ------------------- <end log output> -------------------
>
> So I compared some schema and content, figured out it is from 
> reviewboard.django_project_version. Then I took dumpdb this time, and 
> deleted the last record of reviewboard.django_project_version, retried 
> upgrading, it now fails with
>
>
> ----------------- <begin log output> ------------------
> Creating tables ...
> Upgrading Review Board from 1.7.12 to 1.7.28
> There are unapplied evolutions for accounts.
> There are unapplied evolutions for attachments.
> There are unapplied evolutions for diffviewer.
> There are unapplied evolutions for site.
> Project signature has changed - an evolution is required
> Installing custom SQL ...
> Installing indexes ...
> Installed 0 object(s) from 0 fixture(s)
> The stored evolutions do not completely resolve all model changes.
> Run `./manage.py evolve --hint` to see a suggestion for the changes 
> required.
>
> The following are the changes that could not be resolved:
> In model attachments.FileAttachment:
>     Field 'orig_filename' has been added
> In model hostingsvcs.HostingServiceAccount:
>     Field 'hosting_url' has been added
> The model auth.Message has been deleted
> In model reviews.FileAttachmentComment:
>     Field 'extra_data' has been added
> In model reviews.ReviewRequest:
>     Field 'last_review_activity_timestamp' has been added
>     Field 'depends_on' has been added
>     Field 'last_review_timestamp' has been deleted
> In model reviews.ReviewRequestDraft:
>     Field 'depends_on' has been added
> In model accounts.Profile:
>     Field 'timezone' has been added
>     Field 'open_an_issue' has been added
>     Field 'extra_data' has been added
> In model diffviewer.DiffSetHistory:
>     Field 'last_diff_updated' has been added
> In model diffviewer.FileDiff:
>     Field 'diff_hash' has been added
>     Field 'parent_diff_hash' has been added
>     Field 'diff64' has been added
>     Field 'parent_diff64' has been added
>     Field 'parent_diff' has been deleted
>     Field 'diff' has been deleted
> Error: Your models contain changes that Django Evolution cannot resolve 
> automatically.
>
> How can I proceed? I have a backup before this happens (quite old so not 
> possible to load back).
>

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