I tried to fix the bug by simple detecting the current core schema and "i" and 
the iterating through all update scripts in form of 'core_"i"_"i+1"' its simple 
and straight forward. No looking for paths and leaving us to actually only 
worry about upgrade +1 increasing upgrade scripts. If the basic idea is OK I 
can propose for merging.

** Changed in: zeitgeist
     Assignee: (unassigned) => Seif Lotfy (seif)

** Branch linked: lp:~seif/zeitgeist/fix-643303

Upgrade of the db schema strategy for version jumps
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Status in Zeitgeist Framework: Triaged

Bug description:
We have to discuss how to support versions jump in the upgrade path of our db 
schema, like from ("core", 0) to ("core", 2). This becomes even more important 
when we reach the next version.

For me there are two solution:
1.) write 'dummy' upgrade scripts, like core_0_2.py, which do not more than 
running core_0_1.run() and core_1_2.run() one after another
2.) add some magic to sql._do_schema_upgrade() which automatically tries to 
find an upgrade path and run the 'shortest' possible one.

There is an issue with both solutions: right now the upgrade mechanism is 
designed in a way that after each data upgrade the schema upgrade is done. In 
both solutions the schema upgrade will be done *after* the full upgrade path. 
This can be handled by solution 1.) in the sanest possible way, the downside is 
that 1.) does not scale well for big numbers of schema versions around.

Any Ideas?

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