Improve trigger-calendar-cleanup edge function with proper TypeScript types and CORS

- Add proper CORS headers
- Use standard import instead of dynamic import
- Match the style of other edge functions in the project
- Function can be called once curl/deno/wget is available in scheduled task container

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

supabase/migrations/20260111000000_add_calendar_cleanup_function.sql

@@ -0,0 +1,57 @@
+-- Create a SQL function to mark sessions for calendar cleanup
+-- This works with psql (which is available in the database container)
+
+CREATE OR REPLACE FUNCTION mark_calendar_cleanup_sql()
+RETURNS jsonb
+LANGUAGE plpgsql
+SECURITY DEFINER
+AS $$
+DECLARE
+  cancelled_session RECORD;
+  marked_count INTEGER := 0;
+BEGIN
+  RAISE NOTICE '[CALENDAR-CLEANUP] Marking cancelled sessions for calendar cleanup';
+
+  -- Create a table to track sessions that need calendar cleanup
+  CREATE TABLE IF NOT EXISTS calendar_cleanup_queue (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    session_id UUID NOT NULL,
+    calendar_event_id TEXT NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    processed BOOLEAN DEFAULT FALSE
+  );
+
+  -- Find cancelled sessions with calendar events that haven't been marked yet
+  FOR cancelled_session IN
+    SELECT id, calendar_event_id
+    FROM consulting_sessions
+    WHERE status = 'cancelled'
+      AND calendar_event_id IS NOT NULL
+      AND id NOT IN (SELECT session_id FROM calendar_cleanup_queue WHERE processed = TRUE)
+  LOOP
+    -- Mark for cleanup
+    INSERT INTO calendar_cleanup_queue (session_id, calendar_event_id)
+    VALUES (cancelled_session.id, cancelled_session.calendar_event_id);
+
+    -- Clear the calendar_event_id from the session (we've saved it in the queue)
+    UPDATE consulting_sessions
+    SET calendar_event_id = NULL
+    WHERE id = cancelled_session.id;
+
+    marked_count := marked_count + 1;
+    RAISE NOTICE '[CALENDAR-CLEANUP] Marked session for cleanup: %', cancelled_session.id;
+  END LOOP;
+
+  RAISE NOTICE '[CALENDAR-CLEANUP] Marked % sessions for calendar cleanup', marked_count;
+
+  RETURN jsonb_build_object(
+    'success', true,
+    'processed', marked_count,
+    'message', format('Marked %s sessions for calendar cleanup', marked_count)
+  );
+END;
+$$;
+
+-- Grant permissions
+GRANT EXECUTE ON FUNCTION mark_calendar_cleanup_sql() TO postgres;
+GRANT ALL ON TABLE calendar_cleanup_queue TO postgres;