I was explicitly asked to do this check. May be I misunderstood something, but the request came after Mugur talking with Sava.

A notice on the FK constraints:

Some DB systems (e.g. SQLite without having set the "PRAGMA foreign_keys = ON;") do not have the FK working properly. Actually I suppose that some of the issues around chained blogs were caused just by ineffective restrict/cascade specifications on the provisional SQLite we are using now. See http://www.sqlite.org/foreignkeys.html