[sigi45]

I like the approach and think something like this is fun but i don't understand the businsess case at all.

I would have migrated MySQL 5.5 to 5.6 first, than cleaned the shit out of it, normalized everything, added a few indezes and suddently realize that there is not much left to do.

I like to work with postgresql but if you have 1,2k dbs which are more or less not claned up and crappy, what are they used anyway?

[richdougherty]

I agree. It sounds like they decided to do a cleanup ahead of an investment and not much of a real business case. Your migration path seems much, much simpler - and that's assuming the cleanup is even needed in the first place.