Move push notification to client instead of db trigger

supabase/migrations/20260228150000_add_notification_pushes.sql

@@ -0,0 +1,20 @@
+-- Create a table to record which notifications have been pushed by the edge function
+CREATE TABLE IF NOT EXISTS public.notification_pushes (
+  notification_id uuid PRIMARY KEY,
+  pushed_at timestamptz NOT NULL DEFAULT now()
+);
+
+-- Helper function: try to mark a notification as pushed. Returns true if the
+-- insert succeeded (i.e. this notification was not previously pushed), false
+-- if it already existed.
+CREATE OR REPLACE FUNCTION public.try_mark_notification_pushed(p_notification_id uuid)
+RETURNS boolean LANGUAGE plpgsql AS $$
+BEGIN
+  INSERT INTO public.notification_pushes(notification_id) VALUES (p_notification_id)
+  ON CONFLICT DO NOTHING;
+  RETURN FOUND; -- true if insert happened, false if ON CONFLICT prevented insert
+END;
+$$;
+
+-- index for quick lookup by pushed_at if needed
+CREATE INDEX IF NOT EXISTS idx_notification_pushes_pushed_at ON public.notification_pushes(pushed_at);