Load distribution in refresh provision

lib/default-provisions.js

@@ -29,7 +29,8 @@ function refresh(sessionData, provision, declarations, startRevision, endRevisio
   path.length = MAX_DEPTH;
   path.fill("*", l);
   let every = 1000 * (provision[2] || 1);
-  let t = Math.trunc(sessionData.timestamp / every) * every;
+  let offset = Math.abs(common.djb2(sessionData.deviceId)) % 86400000;
+  let t = Math.trunc((sessionData.timestamp + offset) / every) * every - offset;
 
   for (let i = l; i < path.length; ++ i)
     declarations.push([path.slice(0, i), t, {object: 1, writable: 1, value: t}]);