Microsoft’s latest Fabric database push is another sign that the company wants to own not just the storage layer, but the operational experience around it as well. The new Database Hub, now in early access, is meant to give engineers a single place to manage databases spanning Azure SQL, Azure Cosmos DB, Azure Database for PostgreSQL, Azure Database for MySQL, SQL Server enabled by Azure Arc, and other Fabric services. That is an ambitious scope, and it arrives at a moment when Microsoft is...