* Migrate existing Version-Sprints to new Sprint model

* Journal is written to inform user about the type change


<br>

> * Migration considerations:
>
> * Existing versions used as sprints are migrated (read copied).
>
> * The goal is to have an uninterrupted user experience when switching from the pre-sprint state to the post-sprint state.
>
> * A version is migrated to a sprint if
>
> * the version is configured to be displayed &quot;left&quot; (for &quot;Column in backlog&quot;) in a project
>
> * Backlogs is active in that project
>
> * the version has at least one work package associated to it in that project
>
> * Name, start &amp; finish date, status are migrated
>
> * Mapping of status
>
> * Version open -&gt; Sprint in planning
>
> * Version locked or closed -&gt; Sprint completed
>
> * The project the sprint is created in and the sharing it has:
>
> * _\[open\] Needs to be defined_
>
> * The existing connection from a work package to a version is kept
>
> * The reason for this is that we cannot differentiate programmatically whether a version was only used as a sprint or if it also served the role of a version.
>
> * Work packages associated to a migrated version are associated to the created sprint.
>
> * A journal is written by the system user informing about the shift from version to sprint - no notification is sent
>
> * _\[open\] Phrasing of the message: &quot;Version &#39;{version name} has been converted to a sprint.&quot;_
>
> * Begin of the insertionMigrating permissions are done separately in <mention class="mention" data-id="71253" data-type="work_package" data-text="##71253">##71253</mention>&nbsp;End of the insertion Begin of the deletion Permissions need to be migrated:End of the deletion
> Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion > Begin of the deletion End of the deletion * Begin of the insertion**For 17.2**End of the insertion Begin of the deletion View master backlog → View sprints
&gt;
&gt; * View taskboards → View sprints
&gt;
&gt; * Select done statuses (remove later on or removeEnd of the deletion the Begin of the insertionVersions are migrated Sprints first, so we don&#39;t lose data.End of the insertion Begin of the deletion functionality with it)End of the deletion
> Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion > Begin of the insertion End of the insertion Begin of the deletion End of the deletion * Begin of the insertionMapping VersionsEnd of the insertion Begin of the deletion Update sprints → _(remove, butEnd of the deletion to Begin of the insertionSprints:End of the insertion Begin of the deletion be confirmed)_End of the deletion
> Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion > * Begin of the insertionNot Shared -&gt; Not SharedEnd of the insertion Begin of the deletion Manage versions&amp;nbsp; → Create sprints (?)End of the deletion
>
> * Begin of the deletion Assign versions → (split) Manage sprint items
&gt;

&lt;br&gt;

Notes:

* Versions sharing defined in `app/models/versions/scopes/shared_with.rb`

* Mapping Versions to Sprints:

* Not Shared -&amp;gt; Not Shared

* End of the deletion With Subprojects -&gt; With Subprojects Begin of the insertion
>
> End of the insertion Begin of the deletion

End of the deletion * With Project Hierarchy -&gt; With Subprojects Begin of the insertion
>
> End of the insertion Begin of the deletion

End of the deletion * Simulate Hierarchy by finding the root Project and apply sharing with Subprojects. As a side effect, the sprint will be shared with the original Projects&#39; sibling as well. Begin of the insertion
>
> End of the insertion Begin of the deletion

End of the deletion * With Project Tree -&gt; With Subprojects Begin of the insertion
>
> End of the insertion Begin of the deletion

End of the deletion * Finding root Project, same as Hierarchy. Begin of the insertion
>
> End of the insertion Begin of the deletion

End of the deletion * All Projects -&gt; All Projects Begin of the insertion
>

Notes:

* Versions sharing defined in `app/models/versions/scopes/shared_with.rb`End of the insertion