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Quick demo of Zero's new Background Queries More information in thread below 👇

Zero’s sync engine is query-based. Rather than specifying what to sync with rules or some separate system, you use queries. Right inside the client app, you do queries using a full sql-style language. You get filters, subqueries , limits, etc. Zero syncs the data for these queries to the client.

It’s important to realize because of this syncing, Zero isn’t really a cache. It’s a replica. It’s eagerly replicating a slice of your database - the slice covered by the queries you have open. So there's never stale data in Zero. When you close a query, we delete its rows so they don't go stale.

This is much different than normal caching because this data stays up to date. If you make the same query again, the results will be *instantly* available *and already up to date with server*.

If you make a different query the data from the background query is used client-side to answer the new query instantly if possible. This all happens completely automatically. Just by adding the ttl flag. Learn more about Zero's query-based sync: zero.rocicorp.dev/docs/reading...