Null out sponsorship values when foreign key deleted (#1733)

This allows us to maintain record of sponsorships up
until they are explicitly removed. Fixes issues where removing
sponsorships from organizations with invalid sponsorships would error

util/Migrator/DbScripts/2021-11-23_00_NullOrganizationSponsorshipOnFkDelete.sql

@@ -0,0 +1,86 @@
+-- OrganizationSponsorship_OrganizationDeleted
+IF OBJECT_ID('[dbo].[OrganizationSponsorship_OrganizationDeleted]') IS NOT NULL
+BEGIN
+    DROP PROCEDURE [dbo].[OrganizationSponsorship_OrganizationDeleted]
+END
+GO
+
+CREATE PROCEDURE [dbo].[OrganizationSponsorship_OrganizationDeleted]
+    @OrganizationId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    UPDATE
+        [dbo].[OrganizationSponsorship]
+    SET
+        [SponsoringOrganizationId] = NULL
+    WHERE
+        [SponsoringOrganizationId] = @OrganizationId AND
+        [CloudSponsor] = 0
+
+    UPDATE
+        [dbo].[OrganizationSponsorship]
+    SET
+        [SponsoredOrganizationId] = NULL
+    WHERE
+        [SponsoredOrganizationId] = @OrganizationId AND
+        [CloudSponsor] = 0
+
+    DELETE
+    FROM
+        [dbo].[OrganizationSponsorship]
+    WHERE
+        [CloudSponsor] = 1 AND
+        ([SponsoredOrganizationId] = @OrganizationId OR
+         [SponsoringOrganizationId] = @OrganizationId)
+END
+GO
+
+-- OrganizationSponsorship_OrganizationUserDeleted
+IF OBJECT_ID('[dbo].[OrganizationSponsorship_OrganizationUserDeleted]') IS NOT NULL
+BEGIN
+    DROP PROCEDURE [dbo].[OrganizationSponsorship_OrganizationUserDeleted]
+END
+GO
+
+CREATE PROCEDURE [dbo].[OrganizationSponsorship_OrganizationUserDeleted]
+    @OrganizationUserId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    UPDATE
+        OS
+    SET
+        [SponsoringOrganizationUserId] = NULL
+    FROM
+        [dbo].[OrganizationSponsorship] OS
+    WHERE
+        [SponsoringOrganizationUserId] = @OrganizationUserId
+END
+GO
+
+-- OrganizationSponsorship_OrganizationUsersDeleted
+IF OBJECT_ID('[dbo].[OrganizationSponsorship_OrganizationUsersDeleted]') IS NOT NULL
+BEGIN
+    DROP PROCEDURE [dbo].[OrganizationSponsorship_OrganizationUsersDeleted]
+END
+GO
+
+CREATE PROCEDURE [dbo].[OrganizationSponsorship_OrganizationUsersDeleted]
+    @SponsoringOrganizationUserIds [dbo].[GuidIdArray] READONLY
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    UPDATE
+        OS
+    SET
+        [SponsoringOrganizationUserId] = NULL
+    FROM
+        [dbo].[OrganizationSponsorship] OS
+    INNER JOIN
+        @SponsoringOrganizationUserIds I ON I.Id = OS.SponsoringOrganizationUserId
+END
+GO