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I'm implementing one to one chat in firebase. I'm bit confuse with the data structure. There is best practice available for firechat, but that's for group chat not for one to one chat.

I've design the following data structure, Can anyone suggests the better way or point correction.

chat-messages/
   <chat-id>
     <message-id>
        userId - The id of the user that sent the message.
        name - The name of the user that sent the message.
        message - The content of the message.
        timestamp - The time at which the message was sent.

chat-metadata/
   <chat-id>
        createdAt - The time at which the room was created.
        createdByUserId- The id of the user that created the room.
        id - The id of the room.

my-chats/
  <user-id>
     <other-user-id>
        chatId - The chat id

users/
  <user-id>
        id - The id of the user.
        name - The display name of the user.

In my-chats it will show the all of people user has done chatting. So for username1 and username2 there will be each entries for respective user like

my-chats
  username1
    username2
       chatId:-K6OqUkJRDpnOahGQ4rO
  username2
    username1
       chatId:-K6OqUkJRDpnOahGQ4rO
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