2. Write a test for test/xml/Odds_XML-long-import.xml once it no
longer takes 10 minutes to import (Postgres only?).
-3. Write a test for the ON DELETE CASCADE behavior which is supposed
- to be default but does not seem to work at the moment.
+3. Write a test for the ON DELETE CASCADE behavior.
-4. Add top-level message tables for all types so that we can link all
- records to a message and use the message's time stamp to (cascade)
- delete old data.
+4. Add a test for inserting duplicate messages.