Moving database definition models, so they are shared and can be used in the sql syntax provider.

src/Umbraco.Core/Persistence/DatabaseModelDefinitions/SystemMethods.cs

@@ -0,0 +1,10 @@
+namespace Umbraco.Core.Persistence.DatabaseModelDefinitions
+{
+    public enum SystemMethods
+    {
+        NewGuid,
+        NewSequentialId,
+        CurrentDateTime,
+        CurrentUTCDateTime
+    }
+}