Add action_type to submission items

supabase/migrations/20251013182948_4e9710fc-7ef6-4278-9cb7-ecec66eac4b3.sql

@@ -0,0 +1,21 @@
+-- Add action_type column to submission_items to preserve original submission intent
+ALTER TABLE submission_items 
+ADD COLUMN IF NOT EXISTS action_type text DEFAULT 'create';
+
+-- Add check constraint to ensure valid values
+ALTER TABLE submission_items
+ADD CONSTRAINT submission_items_action_type_check 
+CHECK (action_type IN ('create', 'edit', 'delete'));
+
+-- Create index for better query performance
+CREATE INDEX IF NOT EXISTS idx_submission_items_action_type 
+ON submission_items(action_type);
+
+-- Backfill existing records based on original_data presence
+UPDATE submission_items
+SET action_type = CASE
+  WHEN item_type = 'photo_delete' THEN 'delete'
+  WHEN original_data IS NULL OR original_data::text = '{}' THEN 'create'
+  ELSE 'edit'
+END
+WHERE action_type IS NULL;