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4:20 AM
The room in question may end up getting frozen soon, as I just created another room parented to its same site. See Mithical's answer below. — Sonic the Anonymous Hedgehog 3 hours ago
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Q: What kind of unusual chatroom is this? It does not freeze

MartinI have noticed a chatroom called Mathematics. The transcript starts on 12 September 2014. It is unusual in several aspects: The first day of transcript shows similar messages which are shown in the "main" chatroom - many sites have a room that was created together with creation of the site. ("We...

7
A: What kind of unusual chatroom is this? It does not freeze

MithicalIt looks like somehow, the room isn't hosted on Mathematics.SE, but rather chat.Math.SE. If you go to the "all rooms" button on that room, it takes you to https://chat.stackexchange.com/?tab=site&host=chat.math.stackexchange.com. To contrast, the same button in the main Math.SE room links to http...

@SonictheAnonymousHedgehog Keep in mind that the new room needs at least some messages - in order to survive longer than 7 days. ("A room is considered worth retaining if it has more than 15 messages by at least 2 users. Rooms not worth retaining which are inactive for 7 days will be deleted. Rooms worth retaining which are inactive for 14 days will be frozen.") I have posted something into the "mysterious room" after posting this question, so there is some time before reaching 14 days of inactivity. — Martin 19 secs ago
Turns out, the system doesn't validate the field for parent sites. I was just able to create another room with chat.Math.SE as the parent site, by tweaking the page HTML. — Sonic the Anonymous Hedgehog 3 hours ago
 

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