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by brickcap 3751 days ago
Have you looked at couchdb? It has an http api and you can "watch" the modifications made to the database using a "_changes" feed that has options for longpoll, eventsource and a "continuous poll".

Web socket is not supported out of the box yet but you can always put couchdb in front of a proxy and send the changes feed over the socket connection once it's established.