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docs/scalability.md

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+## Step 1 – players and dialogs centralized, rooms distributed
+All players are located on the same node. The client traffic is terminated on the same node
+
+Rooms and their history could be located on other nodes.
+
+The membership data:
+- If the room and the player are located on the same node, it is on the same node and updated atomically.
+- If the room and the player are located on different nodes, the membership data is split into two parts:
+  - The player-specific membership contains all data necessary to validate commands on the player's node side.
+    It is located on the player's node.
+  - The room-specific membership contains all data needed to respond to queries such as "list users".
+    It is located on the room's node.
+
+Dialogs and their history are located on the same node, as all players.
+
+The allocation is specified statically in the configuration file.
+
+## Step 2 – players and dialogs distributed
+
+## Step 3 – dynamic allocation and consensus
+
+## Step 4 – all data replicated
+
+## Step 5 – chat history fragmented