You can clone with
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As agreed at http://trac.ckan.org/ticket/1610 we should do this, just not right now.
I'm not yet entirely sure we should do this :-) -- I think we probably want a further discussion of pros / cons of PG vs sqlite vs ElasticSearch (and cost of change). Existing excellent summary of pros/cons is at: http://ckan.okfnpad.org/webstore-postgres-sqlite