fix: change order keys for clickhouse tables

* wip

* rename

* fix: minor things before merging new order keys

* fix: add maintenance mode

* fix: update order by for session and events

* fix: remove properties from sessions and final migration test

* fix: set end date on migrations

* fix: comments

apps/start/src/hooks/use-app-context.ts

@@ -17,5 +17,6 @@ export function useAppContext() {
     apiUrl: params.apiUrl,
     dashboardUrl: params.dashboardUrl,
     isSelfHosted: params.isSelfHosted,
+    isMaintenance: params.isMaintenance ?? false,
   };
 }