[@_ck_ Participant 16 years, 3 months ago]

No, 1.0 alpha CHANGES the database upon install/upgrade that will make the database incompatible with 0.9.

You may find yourself thinking it’s still working with 0.9 afterwards, but there will be critical updates missing, for example the topicmeta table is no longer used or updated in 1.0, even though it’s left in the db.