Parent comment isn't asking how data is requested from the back-end. GP comment is (seemingly) describing keeping an entirely client side instance (data stored

Parent comment isn't asking how data is requested from the back-end. GP comment is (seemingly) describing keeping an entirely client side instance (data stored locally / in memory) snapshot of the back-end database. Parent comment is asking how the two are kept in sync. It's hard to believe it would be the method you're describing and take 25ms. If you're doing http range requests, that suggests you're reading from a file which means object storage or disk. I have to assume there is something getting triggered when back end is updating to tell the client to update their instance. (Which very well could just be telling it to execute some sql to get the new / updated information it needs) Or the data is entirely in memory on the back end in an in memory duckdb instance with the latest data and just needs to retrieve it / return it from memory.