feat: dual system messages — detailed in task, brief in chat

- Task comments: who, what, when (detailed history)
- Chat messages: brief notifications
- PATCH /tasks accepts ?actor= for attribution

src/tracker/api/tasks.py

@@ -80,48 +80,83 @@ class AssignRequest(BaseModel):
 
 # --- Helpers ---
 
-async def _system_message(db: AsyncSession, task: Task, content: str, project_slug: str = ""):
-    """Create a system message for a task and broadcast it via WS.
+async def _get_project_chat_id(db: AsyncSession, project_id) -> str | None:
+    """Find project chat UUID."""
+    result = await db.execute(
+        select(Chat).where(Chat.project_id == project_id, Chat.kind == "project")
+    )
+    chat = result.scalar_one_or_none()
+    return chat.id if chat else None
 
-    Message goes to the project chat (visible in ChatPanel) with task_id reference.
+
+async def _system_message(
+    db: AsyncSession,
+    task: Task,
+    chat_text: str,
+    task_text: str | None = None,
+    project_slug: str = "",
+    actor_slug: str = "system",
+):
+    """Create system messages: one in project chat + one in task comments.
+    
+    chat_text: short message for project chat
+    task_text: detailed message for task history (if None, same as chat_text)
     """
     from tracker.ws.manager import manager
-
-    # Find project chat
-    chat_id = None
-    if task.project_id:
-        result = await db.execute(
-            select(Chat).where(Chat.project_id == task.project_id, Chat.kind == "project")
-        )
-        chat = result.scalar_one_or_none()
-        if chat:
-            chat_id = chat.id
-
-    msg = Message(
-        chat_id=chat_id,
-        task_id=task.id,
-        author_type="system",
-        author_slug="system",
-        content=content,
-        mentions=[],
-    )
-    db.add(msg)
-    await db.flush()  # get msg.id
+    import datetime
 
     prefix = project_slug[:2].upper() if project_slug else "XX"
     key = f"{prefix}-{task.number}"
+    task_text = task_text or chat_text
+    now = datetime.datetime.now(datetime.timezone.utc)
 
-    event_data = {
-        "id": str(msg.id),
-        "chat_id": str(chat_id) if chat_id else None,
+    chat_id = await _get_project_chat_id(db, task.project_id)
+
+    # 1. Task comment — detailed history
+    task_msg = Message(
+        task_id=task.id,
+        author_type="system",
+        author_slug=actor_slug,
+        content=task_text,
+        mentions=[],
+    )
+    db.add(task_msg)
+
+    # 2. Chat message — brief notification
+    chat_msg = None
+    if chat_id:
+        chat_msg = Message(
+            chat_id=chat_id,
+            author_type="system",
+            author_slug=actor_slug,
+            content=chat_text,
+            mentions=[],
+        )
+        db.add(chat_msg)
+
+    await db.flush()
+
+    # Broadcast task comment
+    await manager.broadcast_task_event(str(task.project_id), "message.new", {
+        "id": str(task_msg.id),
         "task_id": str(task.id),
         "task_key": key,
         "author_type": "system",
-        "author_slug": "system",
-        "content": content,
-        "created_at": msg.created_at.isoformat() if msg.created_at else "",
-    }
-    await manager.broadcast_task_event(str(task.project_id), "message.new", event_data)
+        "author_slug": actor_slug,
+        "content": task_text,
+        "created_at": task_msg.created_at.isoformat() if task_msg.created_at else now.isoformat(),
+    })
+
+    # Broadcast chat message
+    if chat_msg and chat_id:
+        await manager.broadcast_task_event(str(task.project_id), "message.new", {
+            "id": str(chat_msg.id),
+            "chat_id": str(chat_id),
+            "author_type": "system",
+            "author_slug": actor_slug,
+            "content": chat_text,
+            "created_at": chat_msg.created_at.isoformat() if chat_msg.created_at else now.isoformat(),
+        })
 
 
 def _task_out(t: Task, project_slug: str = "") -> dict:
@@ -248,21 +283,29 @@ async def create_task(
     # System message
     slug = project.slug
     key = f"{slug[:2].upper()}-{task.number}"
-    sys_text = f"Задача {key} создана: {task.title}"
+    chat_text = f"{key} создана: {task.title}"
+    task_text = f"Задача создана: {task.title}"
     if task.assignee_slug:
-        sys_text += f". Назначена на @{task.assignee_slug}"
-    await _system_message(db, task_full, sys_text, slug)
+        chat_text += f" → @{task.assignee_slug}"
+        task_text += f". Назначена на @{task.assignee_slug}"
+    await _system_message(db, task_full, chat_text=chat_text, task_text=task_text, project_slug=slug)
     await db.commit()
 
     return _task_out(task_full, slug)
 
 
 @router.patch("/tasks/{task_id}", response_model=TaskOut)
-async def update_task(task_id: str, req: TaskUpdate, db: AsyncSession = Depends(get_db)):
+async def update_task(
+    task_id: str,
+    req: TaskUpdate,
+    actor: Optional[str] = Query(None, description="Who made the change"),
+    db: AsyncSession = Depends(get_db),
+):
     task = await _get_task(task_id, db)
     slug = task.project.slug if task.project else ""
     prefix = slug[:2].upper() if slug else "XX"
     key = f"{prefix}-{task.number}"
+    who = f"@{actor}" if actor else "Кто-то"
 
     old_status = task.status
     old_assignee = task.assignee_slug
@@ -287,13 +330,33 @@ async def update_task(task_id: str, req: TaskUpdate, db: AsyncSession = Depends(
         task.position = req.position
 
     # System messages for important changes
+    import datetime
+    now_str = datetime.datetime.now(datetime.timezone.utc).strftime("%H:%M UTC")
     if req.status is not None and req.status != old_status:
-        await _system_message(db, task, f"{key}: статус изменён {old_status} → {req.status}", slug)
+        await _system_message(
+            db, task,
+            chat_text=f"{key}: {old_status} → {req.status}",
+            task_text=f"{who} изменил статус: {old_status} → {req.status} ({now_str})",
+            project_slug=slug,
+            actor_slug=actor or "system",
+        )
     if req.assignee_slug is not None and req.assignee_slug != old_assignee:
         if req.assignee_slug:
-            await _system_message(db, task, f"{key}: назначена на @{req.assignee_slug}", slug)
+            await _system_message(
+                db, task,
+                chat_text=f"{key}: назначена на @{req.assignee_slug}",
+                task_text=f"{who} назначил задачу на @{req.assignee_slug} ({now_str})",
+                project_slug=slug,
+                actor_slug=actor or "system",
+            )
         else:
-            await _system_message(db, task, f"{key}: исполнитель снят (был @{old_assignee})", slug)
+            await _system_message(
+                db, task,
+                chat_text=f"{key}: исполнитель снят",
+                task_text=f"{who} снял исполнителя @{old_assignee} ({now_str})",
+                project_slug=slug,
+                actor_slug=actor or "system",
+            )
 
     await db.commit()
     await db.refresh(task)
@@ -343,7 +406,15 @@ async def take_task(task_id: str, slug: str = Query(...), db: AsyncSession = Dep
     proj_slug = task.project.slug if task.project else ""
     prefix = proj_slug[:2].upper() if proj_slug else "XX"
     key = f"{prefix}-{task.number}"
-    await _system_message(db, task, f"{key}: @{slug} взял задачу в работу", proj_slug)
+    import datetime
+    now_str = datetime.datetime.now(datetime.timezone.utc).strftime("%H:%M UTC")
+    await _system_message(
+        db, task,
+        chat_text=f"{key}: @{slug} взял в работу",
+        task_text=f"@{slug} взял задачу в работу ({now_str})",
+        project_slug=proj_slug,
+        actor_slug=slug,
+    )
     await db.commit()
 
     # Broadcast task.assigned event
@@ -402,7 +473,12 @@ async def assign_task(task_id: str, req: AssignRequest, db: AsyncSession = Depen
     proj_slug = task.project.slug if task.project else ""
     prefix = proj_slug[:2].upper() if proj_slug else "XX"
     key = f"{prefix}-{task.number}"
-    await _system_message(db, task, f"{key}: назначена на @{req.assignee_slug}", proj_slug)
+    await _system_message(
+        db, task,
+        chat_text=f"{key}: назначена на @{req.assignee_slug}",
+        task_text=f"Задача назначена на @{req.assignee_slug}",
+        project_slug=proj_slug,
+    )
     await db.commit()
 
     # Broadcast task.assigned event