Resolve error when deleting an account connected to a provider (#1580)

util/Migrator/DbScripts/2021-09-10_00_DeleteProviderUser.sql

@@ -0,0 +1,153 @@
+IF OBJECT_ID('[dbo].[ProviderUser_ReadCountByOnlyOwner]') IS NOT NULL
+BEGIN
+    DROP PROCEDURE [dbo].[ProviderUser_ReadCountByOnlyOwner]
+END
+GO
+
+CREATE PROCEDURE [dbo].[ProviderUser_ReadCountByOnlyOwner]
+@UserId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    ;WITH [OwnerCountCTE] AS
+    (
+        SELECT
+            PU.[UserId],
+            COUNT(1) OVER (PARTITION BY PU.[ProviderId]) [ConfirmedOwnerCount]
+        FROM
+            [dbo].[ProviderUser] PU
+        WHERE
+            PU.[Type] = 0 -- 0 = ProviderAdmin
+            AND PU.[Status] = 2 -- 2 = Confirmed
+    )
+     SELECT
+         COUNT(1)
+     FROM
+         [OwnerCountCTE] OC
+     WHERE
+        OC.[UserId] = @UserId
+        AND OC.[ConfirmedOwnerCount] = 1
+END
+GO
+
+IF OBJECT_ID('[dbo].[User_DeleteById]') IS NOT NULL
+    BEGIN
+        DROP PROCEDURE [dbo].[User_DeleteById]
+    END
+GO
+
+CREATE PROCEDURE [dbo].[User_DeleteById]
+    @Id UNIQUEIDENTIFIER
+WITH RECOMPILE
+AS
+BEGIN
+    SET NOCOUNT ON
+    DECLARE @BatchSize INT = 100
+
+    -- Delete ciphers
+    WHILE @BatchSize > 0
+        BEGIN
+            BEGIN TRANSACTION User_DeleteById_Ciphers
+
+                DELETE TOP(@BatchSize)
+                FROM
+                    [dbo].[Cipher]
+                WHERE
+                        [UserId] = @Id
+
+                SET @BatchSize = @@ROWCOUNT
+
+            COMMIT TRANSACTION User_DeleteById_Ciphers
+        END
+
+    BEGIN TRANSACTION User_DeleteById
+
+        -- Delete folders
+        DELETE
+        FROM
+            [dbo].[Folder]
+        WHERE
+            [UserId] = @Id
+
+        -- Delete devices
+        DELETE
+        FROM
+            [dbo].[Device]
+        WHERE
+            [UserId] = @Id
+
+        -- Delete collection users
+        DELETE
+            CU
+        FROM
+            [dbo].[CollectionUser] CU
+        INNER JOIN
+            [dbo].[OrganizationUser] OU ON OU.[Id] = CU.[OrganizationUserId]
+        WHERE
+            OU.[UserId] = @Id
+
+        -- Delete group users
+        DELETE
+            GU
+        FROM
+            [dbo].[GroupUser] GU
+        INNER JOIN
+            [dbo].[OrganizationUser] OU ON OU.[Id] = GU.[OrganizationUserId]
+        WHERE
+            OU.[UserId] = @Id
+
+        -- Delete organization users
+        DELETE
+        FROM
+            [dbo].[OrganizationUser]
+        WHERE
+            [UserId] = @Id
+
+        -- Delete provider users
+        DELETE
+        FROM
+            [dbo].[ProviderUser]
+        WHERE
+            [UserId] = @Id
+
+        -- Delete U2F logins
+        DELETE
+        FROM
+            [dbo].[U2f]
+        WHERE
+            [UserId] = @Id
+
+        -- Delete SSO Users
+        DELETE
+        FROM
+            [dbo].[SsoUser]
+        WHERE
+            [UserId] = @Id
+
+        -- Delete Emergency Accesses
+        DELETE
+        FROM
+            [dbo].[EmergencyAccess]
+        WHERE
+            [GrantorId] = @Id
+        OR
+            [GranteeId] = @Id
+
+        -- Delete Sends
+        DELETE
+        FROM
+            [dbo].[Send]
+        WHERE
+            [UserId] = @Id
+
+        -- Finally, delete the user
+        DELETE
+        FROM
+            [dbo].[User]
+        WHERE
+            [Id] = @Id
+
+    COMMIT TRANSACTION User_DeleteById
+END
+go