diff --git a/public/openapi/components/schemas/TeaserObject.yaml b/public/openapi/components/schemas/TeaserObject.yaml
index 93eeafa86e..2018685c1b 100644
--- a/public/openapi/components/schemas/TeaserObject.yaml
+++ b/public/openapi/components/schemas/TeaserObject.yaml
@@ -1,14 +1,24 @@
 TeaserObject:
   type: object
+  nullable: true
   properties:
-    roomId:
+    pid:
       type: number
-    fromuid:
-      type: number
-    content:
+    url:
       type: string
+    uid:
+      type: number
+      description: A user identifier
     timestamp:
       type: number
+    tid:
+      type: number
+      description: A topic identifier
+    content:
+      type: string
+    sourceContent:
+      type: string
+      nullable: true
     timestampISO:
       type: string
       description: An ISO 8601 formatted date string (complementing `timestamp`)
@@ -18,15 +28,13 @@ TeaserObject:
         uid:
           type: number
           description: A user identifier
-        isLocal:
-          type: boolean
-          description: Whether the user belongs to the local installation or not.
         username:
           type: string
           description: A friendly name for a given user account
         displayname:
           type: string
-          description: This is either username or fullname depending on forum and user settings
+        isLocal:
+          type: boolean
         userslug:
           type: string
           description: An URL-safe variant of the username (i.e. lower-cased, spaces
@@ -34,10 +42,6 @@ TeaserObject:
         picture:
           nullable: true
           type: string
-        status:
-          type: string
-        lastonline:
-          type: number
         icon:text:
           type: string
           description: A single-letter representation of a username. This is used in the
@@ -50,6 +54,10 @@ TeaserObject:
             `icon:text` for the user's
             auto-generated icon
           example: "#f44336"
-        lastonlineISO:
-          type: string
-  nullable: true
+    topic:
+      type: object
+      additionalProperties: {}
+    index:
+      type: number
+  required:
+    - pid
\ No newline at end of file
diff --git a/public/openapi/read/user/userslug/chats/roomid.yaml b/public/openapi/read/user/userslug/chats/roomid.yaml
index 4468d9c0a1..448f350a42 100644
--- a/public/openapi/read/user/userslug/chats/roomid.yaml
+++ b/public/openapi/read/user/userslug/chats/roomid.yaml
@@ -264,7 +264,60 @@ get:
                         unread:
                           type: boolean
                         teaser:
-                          $ref: ../../../../components/schemas/TeaserObject.yaml#/TeaserObject
+                          type: object
+                          properties:
+                            roomId:
+                              type: number
+                            fromuid:
+                              type: number
+                            content:
+                              type: string
+                            timestamp:
+                              type: number
+                            timestampISO:
+                              type: string
+                              description: An ISO 8601 formatted date string (complementing `timestamp`)
+                            user:
+                              type: object
+                              properties:
+                                uid:
+                                  type: number
+                                  description: A user identifier
+                                isLocal:
+                                  type: boolean
+                                  description: Whether the user belongs to the local installation or not.
+                                username:
+                                  type: string
+                                  description: A friendly name for a given user account
+                                displayname:
+                                  type: string
+                                  description: This is either username or fullname depending on forum and user settings
+                                userslug:
+                                  type: string
+                                  description: An URL-safe variant of the username (i.e. lower-cased, spaces
+                                    removed, etc.)
+                                picture:
+                                  nullable: true
+                                  type: string
+                                status:
+                                  type: string
+                                lastonline:
+                                  type: number
+                                icon:text:
+                                  type: string
+                                  description: A single-letter representation of a username. This is used in the
+                                    auto-generated icon given to users
+                                    without an avatar
+                                icon:bgColor:
+                                  type: string
+                                  description: A six-character hexadecimal colour code assigned to the user. This
+                                    value is used in conjunction with
+                                    `icon:text` for the user's
+                                    auto-generated icon
+                                  example: "#f44336"
+                                lastonlineISO:
+                                  type: string
+                          nullable: true
                         lastUser:
                           type: object
                           properties:
@@ -375,7 +428,58 @@ get:
                         unread:
                           type: boolean
                         teaser:
-                          $ref: ../../../../components/schemas/TeaserObject.yaml#/TeaserObject
+                          type: object
+                          properties:
+                            fromuid:
+                              type: number
+                            content:
+                              type: string
+                            timestamp:
+                              type: number
+                            timestampISO:
+                              type: string
+                              description: An ISO 8601 formatted date string (complementing `timestamp`)
+                            user:
+                              type: object
+                              properties:
+                                uid:
+                                  type: number
+                                  description: A user identifier
+                                isLocal:
+                                  type: boolean
+                                  description: Whether the user belongs to the local installation or not.
+                                username:
+                                  type: string
+                                  description: A friendly name for a given user account
+                                displayname:
+                                  type: string
+                                  description: This is either username or fullname depending on forum and user settings
+                                userslug:
+                                  type: string
+                                  description: An URL-safe variant of the username (i.e. lower-cased, spaces
+                                    removed, etc.)
+                                picture:
+                                  nullable: true
+                                  type: string
+                                status:
+                                  type: string
+                                lastonline:
+                                  type: number
+                                icon:text:
+                                  type: string
+                                  description: A single-letter representation of a username. This is used in the
+                                    auto-generated icon given to users
+                                    without an avatar
+                                icon:bgColor:
+                                  type: string
+                                  description: A six-character hexadecimal colour code assigned to the user. This
+                                    value is used in conjunction with
+                                    `icon:text` for the user's
+                                    auto-generated icon
+                                  example: "#f44336"
+                                lastonlineISO:
+                                  type: string
+                          nullable: true
                         lastUser:
                           type: object
                           properties:
diff --git a/public/openapi/write/chats.yaml b/public/openapi/write/chats.yaml
index 5206482565..37204a9b5c 100644
--- a/public/openapi/write/chats.yaml
+++ b/public/openapi/write/chats.yaml
@@ -47,7 +47,54 @@ get:
                         type: boolean
                         description: Whether or not the chat has unread messages within
                       teaser:
-                        $ref: ../components/schemas/TeaserObject.yaml#/TeaserObject
+                        type: object
+                        nullable: true
+                        properties:
+                          fromuid:
+                            type: number
+                          content:
+                            type: string
+                          timestamp:
+                            type: number
+                          timestampISO:
+                            type: string
+                          user:
+                            type: object
+                            properties:
+                              uid:
+                                type: number
+                                description: A user identifier
+                              username:
+                                type: string
+                                description: A friendly name for a given user account
+                              displayname:
+                                type: string
+                                description: This is either username or fullname depending on forum and user settings
+                              userslug:
+                                type: string
+                                description: An URL-safe variant of the username (i.e. lower-cased, spaces
+                                  removed, etc.)
+                              picture:
+                                nullable: true
+                                type: string
+                              status:
+                                type: string
+                              lastonline:
+                                type: number
+                              icon:text:
+                                type: string
+                                description: A single-letter representation of a username. This is used in the
+                                  auto-generated icon given to users
+                                  without an avatar
+                              icon:bgColor:
+                                type: string
+                                description: A six-character hexadecimal colour code assigned to the user. This
+                                  value is used in conjunction with
+                                  `icon:text` for the user's
+                                  auto-generated icon
+                                example: "#f44336"
+                              lastonlineISO:
+                                type: string
                       users:
                         type: array
                         items: