Extract Database to interface

PluralKit.Core/Database/DatabaseExt.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Threading.Tasks;
+
+namespace PluralKit.Core
+{
+    public static class DatabaseExt
+    {
+        public static async Task Execute(this IDatabase db, Func<IPKConnection, Task> func)
+        {
+            await using var conn = await db.Obtain();
+            await func(conn);
+        }
+        
+        public static async Task<T> Execute<T>(this IDatabase db, Func<IPKConnection, Task<T>> func)
+        {
+            await using var conn = await db.Obtain();
+            return await func(conn);
+        }
+    }
+}