First pass at unique constraint

util/Migrator/DbScripts/2025-12-20_00_Collection_AddDefaultCollectionOwnerAndConstraint.sql

@@ -0,0 +1,76 @@
+-- Add DefaultCollectionOwner column to Collection table for Type=1 collections
+-- This enables a filtered unique constraint to prevent duplicate default collections
+
+IF NOT EXISTS (
+    SELECT *
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE TABLE_SCHEMA = 'dbo'
+      AND TABLE_NAME = 'Collection'
+      AND COLUMN_NAME = 'DefaultCollectionOwner'
+)
+BEGIN
+    ALTER TABLE [dbo].[Collection]
+        ADD [DefaultCollectionOwner] UNIQUEIDENTIFIER NULL
+END
+GO
+
+-- Add foreign key constraint to OrganizationUser
+IF NOT EXISTS (
+    SELECT *
+    FROM sys.foreign_keys
+    WHERE name = 'FK_Collection_OrganizationUser'
+      AND parent_object_id = OBJECT_ID('[dbo].[Collection]')
+)
+BEGIN
+    ALTER TABLE [dbo].[Collection]
+        ADD CONSTRAINT [FK_Collection_OrganizationUser]
+        FOREIGN KEY ([DefaultCollectionOwner])
+        REFERENCES [dbo].[OrganizationUser] ([Id])
+        ON DELETE SET NULL
+END
+GO
+
+-- Create filtered unique index to prevent duplicate default collections per user
+IF NOT EXISTS (
+    SELECT *
+    FROM sys.indexes
+    WHERE name = 'IX_Collection_DefaultCollectionOwner_OrganizationId_Type'
+      AND object_id = OBJECT_ID('[dbo].[Collection]')
+)
+BEGIN
+    CREATE UNIQUE NONCLUSTERED INDEX [IX_Collection_DefaultCollectionOwner_OrganizationId_Type]
+        ON [dbo].[Collection]([DefaultCollectionOwner], [OrganizationId], [Type])
+        WHERE [Type] = 1;
+END
+GO
+
+-- Refresh dependent views to include new column
+IF OBJECT_ID('[dbo].[CollectionView]') IS NOT NULL
+BEGIN
+    EXECUTE sp_refreshsqlmodule N'[dbo].[CollectionView]';
+END
+GO
+
+IF OBJECT_ID('[dbo].[Collection_ReadById]') IS NOT NULL
+BEGIN
+    EXECUTE sp_refreshsqlmodule N'[dbo].[Collection_ReadById]';
+END
+GO
+
+IF OBJECT_ID('[dbo].[Collection_ReadByIds]') IS NOT NULL
+BEGIN
+    EXECUTE sp_refreshsqlmodule N'[dbo].[Collection_ReadByIds]';
+END
+GO
+
+IF OBJECT_ID('[dbo].[Collection_ReadByOrganizationId]') IS NOT NULL
+BEGIN
+    EXECUTE sp_refreshsqlmodule N'[dbo].[Collection_ReadByOrganizationId]';
+END
+GO
+
+IF OBJECT_ID('[dbo].[UserCollectionDetails]') IS NOT NULL
+BEGIN
+    EXECUTE sp_refreshsqlmodule N'[dbo].[UserCollectionDetails]';
+END
+GO