Please add estimated time in hours.

Do we have this implemented already? Please update estimated hours and spent hours for the task.

We have implemented basic support for XEP-0136 which enables users to enable/disable saving all chat messages on server. Current implementation also supports retrieving stored messages.

There are two differences:

1. Our implementation uses date o saved chat message as collection id instead of threadid as described in XEP-0136.

2. Our implementation requires passing both to and from parameters when requesting for collections or items of collection. (To and from parameters are used to specify period of time to retrieve)