Store stard status in the database

PluralKit.Core/Models/PKShardInfo.cs

@@ -0,0 +1,19 @@
+using NodaTime;
+
+namespace PluralKit.Core
+{
+    public class PKShardInfo
+    {
+        public int Id { get; }
+        public ShardStatus Status { get; }
+        public float? Ping { get; }
+        public Instant? LastHeartbeat { get; }
+        public Instant? LastConnection { get; }
+
+        public enum ShardStatus
+        {
+            Down = 0,
+            Up = 1
+        }
+    }
+}