"user key" schema and api changes

src/Sql/dbo/Stored Procedures/User_UpdateKeys.sql

@@ -0,0 +1,21 @@
+CREATE PROCEDURE [dbo].[User_UpdateKeys]
+    @Id UNIQUEIDENTIFIER,
+    @SecurityStamp NVARCHAR(50),
+    @Key NVARCHAR(MAX),
+    @PrivateKey VARCHAR(MAX),
+    @RevisionDate DATETIME2(7)
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    UPDATE
+        [dbo].[User]
+    SET
+        [SecurityStamp] = @SecurityStamp,
+        [Key] = @Key,
+        [PrivateKey] = @PrivateKey,
+        [RevisionDate] = @RevisionDate,
+        [AccountRevisionDate] = @RevisionDate
+    WHERE
+        [Id] = @Id
+END