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TL;DR until I create a better explanation: currently we use an exclusive lock for reading from the database, which is obviously suboptimal. This is an experimental PR to see how difficult it would be to implement a pool of long-lived MDSQLiteConnection objects instead of a single readConnection object.
We could also create a new SqliteConnection object for every request, letting ADO.NET use its internal connection pool, but I haven't yet investigated the potential costs of having to load the PowerSync SQLite extension every time we do a query.