Regarding replay from genesis. Would using something like SteemSQL or SteemData (MongoDB) helps with speed? We could query only posts that contains valid pocket op and process them. And instead of keeping an list of all users and their post count it can add them as it finds them in a valid post. After a replay it can use the blockchain directly.
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I haven't used those services, so I don't know their capabilities. However, a query on posts wouldn't work because a single post can contain multiple pocket operations due to editing. You really do have to query the blockchain directly.
But if there is a service that lets you see something about what is in a block before you download the whole thing, that could be very helpful. For example, if a block is outside the Genesis interval and it contains no
commentops, then it's not relevant to pocket. That sort of thing.Also, you only need the first 30-40 characters of a pocketsend to check it it's valid. Don't know if that helps any.
I’ll investigate. I think there is a way to get the last version of a post. And maybe a way to get the block details by doing two calls, one to get a preview of the content and another one if we detect a comment op.