diff --git a/backend/alembic/versions/2022_12_29_2103-464ec4667aae_add_collective_flag_to_task.py b/backend/alembic/versions/2022_12_29_2103-464ec4667aae_add_collective_flag_to_task.py
new file mode 100644
index 00000000..cbed707c
--- /dev/null
+++ b/backend/alembic/versions/2022_12_29_2103-464ec4667aae_add_collective_flag_to_task.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+"""add collective flag to task
+
+Revision ID: 464ec4667aae
+Revises: d24b37426857
+Create Date: 2022-12-29 21:03:06.841962
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "464ec4667aae"
+down_revision = "d24b37426857"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column(
+        "work_package", sa.Column("collective", sa.Boolean(), server_default=sa.text("false"), nullable=False)
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("work_package", "collective")
+    # ### end Alembic commands ###
diff --git a/backend/oasst_backend/api/v1/tasks.py b/backend/oasst_backend/api/v1/tasks.py
index 94a0be4a..1318ba41 100644
--- a/backend/oasst_backend/api/v1/tasks.py
+++ b/backend/oasst_backend/api/v1/tasks.py
@@ -139,7 +139,7 @@ def request_task(
     try:
         pr = PromptRepository(db, api_client, request.user)
         task, thread_id, parent_post_id = generate_task(request, pr)
-        pr.store_task(task, thread_id, parent_post_id)
+        pr.store_task(task, thread_id, parent_post_id, request.collective)
 
     except OasstError:
         raise
@@ -252,3 +252,15 @@ def post_interaction(
     except Exception:
         logger.exception("Interaction request failed.")
         raise OasstError("Interaction request failed.", OasstErrorCode.TASK_INTERACTION_REQUEST_FAILED)
+
+
+@router.post("/close")
+def close_collective_task(
+    close_task_request: protocol_schema.TaskClose,
+    db: Session = Depends(deps.get_db),
+    api_key: APIKey = Depends(deps.get_api_key),
+):
+    api_client = deps.api_auth(api_key, db)
+    pr = PromptRepository(db, api_client, user=None)
+    pr.close_task(close_task_request.post_id)
+    return protocol_schema.TaskDone()
diff --git a/backend/oasst_backend/exceptions.py b/backend/oasst_backend/exceptions.py
index 98224790..ba11e931 100644
--- a/backend/oasst_backend/exceptions.py
+++ b/backend/oasst_backend/exceptions.py
@@ -40,6 +40,7 @@ class OasstErrorCode(IntEnum):
     WORK_PACKAGE_ALREADY_UPDATED = 2103
     WORK_PACKAGE_NOT_ACK = 2104
     WORK_PACKAGE_ALREADY_DONE = 2105
+    WORK_PACKAGE_NOT_COLLECTIVE = 2106
 
 
 class OasstError(Exception):
diff --git a/backend/oasst_backend/models/work_package.py b/backend/oasst_backend/models/work_package.py
index a89ed646..7e568cf7 100644
--- a/backend/oasst_backend/models/work_package.py
+++ b/backend/oasst_backend/models/work_package.py
@@ -32,6 +32,7 @@ class WorkPackage(SQLModel, table=True):
     frontend_ref_post_id: Optional[str] = None
     thread_id: Optional[UUID] = None
     parent_post_id: Optional[UUID] = None
+    collective: bool = Field(sa_column=sa.Column(sa.Boolean, nullable=False, server_default=false()))
 
     @property
     def expired(self) -> bool:
diff --git a/backend/oasst_backend/prompt_repository.py b/backend/oasst_backend/prompt_repository.py
index 6d44c443..f350e9fc 100644
--- a/backend/oasst_backend/prompt_repository.py
+++ b/backend/oasst_backend/prompt_repository.py
@@ -160,8 +160,9 @@ class PromptRepository:
             payload=db_payload.PostPayload(text=text),
             depth=depth,
         )
-        wp.done = True
-        self.db.add(wp)
+        if not wp.collective:
+            wp.done = True
+            self.db.add(wp)
         self.db.commit()
         self.journal.log_text_reply(work_package=wp, post_id=new_post_id, role=role, length=len(text))
         return user_post
@@ -186,6 +187,10 @@ class PromptRepository:
         # store reaction to post
         reaction_payload = db_payload.RatingReactionPayload(rating=rating.rating)
         reaction = self.insert_reaction(post.id, reaction_payload)
+        if not work_package.collective:
+            work_package.done = True
+            self.db.add(work_package)
+
         self.journal.log_rating(work_package, post_id=post.id, rating=rating.rating)
         logger.info(f"Ranking {rating.rating} stored for work_package {work_package.id}.")
         return reaction
@@ -193,8 +198,9 @@ class PromptRepository:
     def store_ranking(self, ranking: protocol_schema.PostRanking) -> PostReaction:
         # fetch work_package
         work_package = self.fetch_workpackage_by_postid(ranking.post_id)
-        work_package.done = True
-        self.db.add(work_package)
+        if not work_package.collective:
+            work_package.done = True
+            self.db.add(work_package)
 
         work_payload: db_payload.RankConversationRepliesPayload | db_payload.RankInitialPromptsPayload = (
             work_package.payload.payload
@@ -250,6 +256,7 @@ class PromptRepository:
         task: protocol_schema.Task,
         thread_id: UUID = None,
         parent_post_id: UUID = None,
+        collective: bool = False,
     ) -> WorkPackage:
         payload: db_payload.TaskPayload
         match type(task):
@@ -287,10 +294,7 @@ class PromptRepository:
                 raise OasstError(f"Invalid task type: {type(task)=}", OasstErrorCode.INVALID_TASK_TYPE)
 
         wp = self.insert_work_package(
-            payload=payload,
-            id=task.id,
-            thread_id=thread_id,
-            parent_post_id=parent_post_id,
+            payload=payload, id=task.id, thread_id=thread_id, parent_post_id=parent_post_id, collective=collective
         )
         assert wp.id == task.id
         return wp
@@ -301,6 +305,7 @@ class PromptRepository:
         id: UUID = None,
         thread_id: UUID = None,
         parent_post_id: UUID = None,
+        collective: bool = False,
     ) -> WorkPackage:
         c = PayloadContainer(payload=payload)
         wp = WorkPackage(
@@ -311,6 +316,7 @@ class PromptRepository:
             api_client_id=self.api_client.id,
             thread_id=thread_id,
             parent_post_id=parent_post_id,
+            collective=collective,
         )
         self.db.add(wp)
         self.db.commit()
@@ -463,3 +469,20 @@ class PromptRepository:
 
     def fetch_post(self, post_id: UUID) -> Optional[Post]:
         return self.db.query(Post).filter(Post.id == post_id).one()
+
+    def close_task(self, post_id: str, allow_personal_tasks: bool = False):
+        self.validate_post_id(post_id)
+        wp = self.fetch_workpackage_by_postid(post_id)
+
+        if not wp:
+            raise OasstError("Work package not found", OasstErrorCode.WORK_PACKAGE_NOT_FOUND)
+        if wp.expired:
+            raise OasstError("Work package expired", OasstErrorCode.WORK_PACKAGE_EXPIRED)
+        if not allow_personal_tasks and not wp.collective:
+            raise OasstError("This is not a collective task", OasstErrorCode.WORK_PACKAGE_NOT_COLLECTIVE)
+        if wp.done:
+            raise OasstError("Allready closed", OasstErrorCode.WORK_PACKAGE_ALREADY_DONE)
+
+        wp.done = True
+        self.db.add(wp)
+        self.db.commit()
diff --git a/discord-bot/api_client.py b/discord-bot/api_client.py
index 1de6bb17..0c88258e 100644
--- a/discord-bot/api_client.py
+++ b/discord-bot/api_client.py
@@ -52,14 +52,19 @@ class ApiClient:
         return self.task_models_map[task_type].parse_obj(data)
 
     def fetch_task(
-        self, task_type: protocol_schema.TaskRequestType, user: Optional[protocol_schema.User] = None
+        self,
+        task_type: protocol_schema.TaskRequestType,
+        user: Optional[protocol_schema.User] = None,
+        collective: bool = False,
     ) -> protocol_schema.Task:
-        req = protocol_schema.TaskRequest(type=task_type, user=user)
+        req = protocol_schema.TaskRequest(type=task_type, user=user, collective=collective)
         data = self.post("/api/v1/tasks/", req.dict())
         return self._parse_task(data)
 
-    def fetch_random_task(self, user: Optional[protocol_schema.User] = None) -> protocol_schema.Task:
-        return self.fetch_task(protocol_schema.TaskRequestType.random, user)
+    def fetch_random_task(
+        self, user: Optional[protocol_schema.User] = None, collective: bool = False
+    ) -> protocol_schema.Task:
+        return self.fetch_task(protocol_schema.TaskRequestType.random, user, collective=collective)
 
     def ack_task(self, task_id: str, post_id: str) -> None:
         req = protocol_schema.TaskAck(post_id=post_id)
diff --git a/oasst-shared/oasst_shared/schemas/protocol.py b/oasst-shared/oasst_shared/schemas/protocol.py
index 17ee23f0..19b1921d 100644
--- a/oasst-shared/oasst_shared/schemas/protocol.py
+++ b/oasst-shared/oasst_shared/schemas/protocol.py
@@ -43,6 +43,7 @@ class TaskRequest(BaseModel):
 
     type: TaskRequestType = TaskRequestType.random
     user: Optional[User] = None
+    collective: bool = False
 
 
 class TaskAck(BaseModel):
@@ -57,6 +58,12 @@ class TaskNAck(BaseModel):
     reason: str
 
 
+class TaskClose(BaseModel):
+    """The frontend asks to mark task as done"""
+
+    post_id: str
+
+
 class Task(BaseModel):
     """A task is a unit of work that the backend gives to the frontend."""