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Is it possible to "backload" changes?

"Start the changefeed at timestamp `x`. Once it's caught up to realtime, keep feeding me new ones"

RethinkDB's `.changes()` command doesn't support this directly. Here is the corresponding github issue: https://github.com/rethinkdb/rethinkdb/issues/3579

The code in the demo does this by performing a separate `between` query.