edit

XLAB2/Infrastructure/IDatabaseConnectionFactory.cs

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+using Microsoft.Data.SqlClient;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace XLAB2.Infrastructure;
+
+internal interface IDatabaseConnectionFactory
+{
+    string ConnectionString { get; }
+
+    DatabaseOptions Options { get; }
+
+    SqlConnection CreateConnection();
+
+    Task<SqlConnection> OpenConnectionAsync(CancellationToken cancellationToken = default);
+}