Add Startup Events to Database

Now emit startup events on conneciton
Some events still to add

ObservatoryFramework/Files/Journal/Powerplay/PowerplayVoucher.cs

@@ -5,5 +5,5 @@ namespace Observatory.Framework.Files.Journal.Powerplay;
 public class PowerplayVoucher : PowerplayJoin
 {
     public override string Event => "PowerplayVoucher";
-    public ImmutableList<string> Systems { get; init; }
+    public ICollection<string> Systems { get; init; }
 }