For Co-op, a bot (Hostbot) will be initiating Flow boards in Wikipedia_talk:Co-op/ SomeUserName
These will not be in $wgFlowOccupyPages, so even before we have full-blown Enable/Disable Flow (https://trello.com/c/P7F12mwL), Flow needs to respect content model on a page that is 'flow-board.'
This requires that $wgContentHandlerUseDB be set. It is set on testwiki but not yet on enwiki (T51193).
This is due December.