fix: unified message format (author object), CASCADE delete tasks, author_id nullable

src/tracker/api/messages.py

@@ -34,8 +34,8 @@ class MessageOut(BaseModel):
     task_id: str | None = None
     parent_id: str | None = None
     author_type: str
-    author_id: str
-    author: dict | None = None  # Member object for display
+    author_id: str | None = None
+    author: dict | None = None  # {id, slug, name} — None for system messages
     content: str
     mentions: list[str] = []
     voice_url: str | None = None
@@ -174,9 +174,8 @@ async def create_message(req: MessageCreate, request: Request, db: AsyncSession
         "chat_id": req.chat_id,
         "task_id": req.task_id,
         "author_type": msg.author_type,
-        "author_id": str(msg.author_id),
-        "author_slug": author_slug,
-        "author_name": author_name,
+        "author_id": str(msg.author_id) if msg.author_id else None,
+        "author": {"id": str(msg.author.id), "slug": msg.author.slug, "name": msg.author.name} if msg.author else None,
         "content": msg.content,
         "mentions": msg.mentions or [],
         "attachments": [

src/tracker/api/tasks.py

@@ -545,7 +545,7 @@ async def reject_task(
     comment = Message(
         task_id=task.id,
         author_type=AuthorType.SYSTEM,
-        author_id=current_member.id,
+        author_id=None,
         content=f"Задача отклонена: {req.reason}",
         mentions=[],
     )

src/tracker/models/chat.py

@@ -35,7 +35,7 @@ class Message(Base):
 
     # Context: one of chat_id or task_id must be set
     chat_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("chats.id"))
-    task_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("tasks.id"))
+    task_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("tasks.id", ondelete="CASCADE"))
 
     # Thread support
     parent_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("messages.id"))

src/tracker/models/task.py

@@ -45,7 +45,7 @@ class Task(Base):
 class Step(Base):
     __tablename__ = "steps"
 
-    task_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("tasks.id"), nullable=False)
+    task_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("tasks.id", ondelete="CASCADE"), nullable=False)
     title: Mapped[str] = mapped_column(String(500), nullable=False)
     done: Mapped[bool] = mapped_column(Boolean, default=False)
     position: Mapped[int] = mapped_column(Integer, default=0)

src/tracker/ws/handler.py

@@ -290,10 +290,10 @@ async def _handle_chat_send(session_id: str, data: dict):
             "task_id": task_id,
             "author_type": member.type,
             "author_id": str(member.id),
-            "author_slug": member.slug,
-            "author_name": member.name,
+            "author": {"id": str(member.id), "slug": member.slug, "name": member.name},
             "content": content,
             "mentions": mentions,
+            "attachments": [],
             "created_at": msg.created_at.isoformat(),
         }