A software vendor is migrating a customer-facing SaaS application to Azure. The relational backend must be fully managed and support automatic patching and high availability. Usage is highly intermittent: the database experiences bursts of activity during business hours but sits completely idle for long overnight and weekend periods. The vendor wants to minimize cost during idle time and is willing to accept a short delay when the first query arrives after inactivity. Which Azure SQL Database compute option should you recommend?