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/server/get-envs.ts

@@ -8,6 +8,7 @@ export const getServerEnvs = createServerFn().handler(async () => {
       process.env.DASHBOARD_URL || process.env.NEXT_PUBLIC_DASHBOARD_URL,
     ),
     isSelfHosted: process.env.SELF_HOSTED !== undefined,
+    isMaintenance: process.env.MAINTENANCE === '1',
   };
 
   return envs;