[Design] Chandler alpha2 data migration plan

[Sheila Mooney]

Since alpha 2 is only a few weeks away, we are overdue posting the  
plans for migrating users from 0.6 or 0.6.1 to 0.7alpha2. In summary,  
it's a bit ugly but there is a migration path. We are working towards  
a better solution for 0.7.

Non Shared Data:

+ The migration path for non-shared data will support calendar data  
only.
+ Users will have to manually export their calendars, then re-import  
them into 0.7alpha2.
+ Each calendar will have to be handled individually since we will  
not have an export/import all feature.
+ Any tasks, notes and emails that are not shared will be lost.

Shared Data:

Currently Cosmo Demo is running Cosmo 0.2.8. Cosmo 0.3 will release  
about the same time as Chandler 0.7alpha2 but we don't quite know  
when we will officially upgrade Cosmo Demo. QA will be covering all  
test scenarios to make sure alpha 2 runs against both Cosmo 0.2.8 and  
0.3.

+ Any shares that users have published can be restored using the  
restore item in the collection menu.
+ Users will have to resubscribe to all previous shares using the  
original tickets they used for 0.6 or 0.6.1.
+ Since we can currently share any type of Chandler item, restoring  
shares will handle more than just calendar events.
+ If you have a Work collection that is shared and a Home collection  
that is not shared AND an event appears on both calendars, you need  
to do the restore before the import  since the shared version will  
have the original UUID.
+ In general we will tell users to restore shares before importing  
other calendars.
+ In reference to Morgen's post about backwards compatibility with  
0.6 shared collections, Chandler 0.6 and 0.6.1 will be able to sync  
shares with 0.7alpha 2 users.

Since we do not have a solution to restore everything in one-step for  
alpha2, we plan to communicate this in a readme and/or on the landing  
page. We will look at modifying the "old repository message" to  
provide more detail and perhaps a link to the migration instructions.  
We will also be working with Heikki and Bear to explore our options  
on the installer side.

Sheila

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