recompute full storage each time

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

@@ -1,15 +1,37 @@
 CREATE PROCEDURE [dbo].[User_UpdateStorage]
-    @Id UNIQUEIDENTIFIER,
-    @StorageIncrease BIGINT
-
+    @Id UNIQUEIDENTIFIER
 AS
 BEGIN
     SET NOCOUNT ON
 
+    DECLARE @Storage BIGINT
+
+    ;WITH [CTE] AS (
+        SELECT
+            [Id],
+            (
+                SELECT
+                    SUM(CAST(JSON_VALUE(value,'$.Size') AS BIGINT))
+                FROM
+                    OPENJSON([Attachments])
+            ) [Size]
+        FROM
+            [dbo].[Cipher]
+    )
+    SELECT
+        @Storage = SUM([CTE].[Size])
+    FROM
+        [dbo].[Cipher] C
+    LEFT JOIN
+        [CTE] ON C.[Id] = [CTE].[Id]
+    WHERE
+        C.[UserId] = @Id
+        AND C.[Attachments] IS NOT NULL
+
     UPDATE
         [dbo].[User]
     SET
-        [Storage] = ISNULL([Storage], 0) + @StorageIncrease,
+        [Storage] = @Storage,
         [RevisionDate] = GETUTCDATE()
     WHERE
         [Id] = @Id