chore: add delete user notification

Author: appflowy

migrations/20250305082545_workspace_delete_trigger.sql

@@ -0,0 +1,22 @@
+-- Create the trigger function
+CREATE OR REPLACE FUNCTION workspace_deleted_trigger_function()
+RETURNS trigger AS
+$$
+DECLARE
+    payload jsonb;
+BEGIN
+    payload := jsonb_build_object(
+        'workspace_id', OLD.workspace_id,
+        'owner_id', OLD.owner_uid
+    );
+
+    PERFORM pg_notify('af_workspace_deleted', payload::text);
+    RETURN OLD;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Create the trigger that calls the function after deleting a workspace
+CREATE TRIGGER on_workspace_delete
+AFTER DELETE ON public.af_workspace
+FOR EACH ROW
+EXECUTE FUNCTION workspace_deleted_trigger_function();