Global labels: remove project_id, endpoints at /labels

Labels are now app-wide, not project-scoped.
GET/POST /labels, PATCH/DELETE /labels/{id}

src/tracker/api/labels.py

@@ -1,4 +1,4 @@
-"""Labels API — CRUD for project-scoped labels."""
+"""Labels API — CRUD for global labels."""
 
 import uuid
 
@@ -26,31 +26,27 @@ class LabelUpdate(BaseModel):
 
 class LabelOut(BaseModel):
     id: str
-    project_id: str
     name: str
     color: str
 
 
-@router.get("/projects/{project_id}/labels", response_model=list[LabelOut])
-async def list_labels(project_id: str, db: AsyncSession = Depends(get_db)):
-    result = await db.execute(
-        select(Label).where(Label.project_id == uuid.UUID(project_id)).order_by(Label.name)
-    )
-    return [LabelOut(id=str(l.id), project_id=str(l.project_id), name=l.name, color=l.color) for l in result.scalars()]
+@router.get("/labels", response_model=list[LabelOut])
+async def list_labels(db: AsyncSession = Depends(get_db)):
+    result = await db.execute(select(Label).order_by(Label.name))
+    return [LabelOut(id=str(l.id), name=l.name, color=l.color) for l in result.scalars()]
 
 
-@router.post("/projects/{project_id}/labels", response_model=LabelOut)
+@router.post("/labels", response_model=LabelOut)
 async def create_label(
-    project_id: str,
     req: LabelCreate,
     current_member: Member = Depends(get_current_member),
     db: AsyncSession = Depends(get_db),
 ):
-    label = Label(project_id=uuid.UUID(project_id), name=req.name, color=req.color)
+    label = Label(name=req.name, color=req.color)
     db.add(label)
     await db.commit()
     await db.refresh(label)
-    return LabelOut(id=str(label.id), project_id=str(label.project_id), name=label.name, color=label.color)
+    return LabelOut(id=str(label.id), name=label.name, color=label.color)
 
 
 @router.patch("/labels/{label_id}", response_model=LabelOut)
@@ -70,7 +66,7 @@ async def update_label(
         label.color = req.color
     await db.commit()
     await db.refresh(label)
-    return LabelOut(id=str(label.id), project_id=str(label.project_id), name=label.name, color=label.color)
+    return LabelOut(id=str(label.id), name=label.name, color=label.color)
 
 
 @router.delete("/labels/{label_id}")
@@ -83,8 +79,6 @@ async def delete_label(
     label = result.scalar_one_or_none()
     if not label:
         raise HTTPException(404, "Label not found")
-    # Remove task associations
-    await db.execute(select(TaskLabel).where(TaskLabel.label_id == label.id))
     await db.delete(label)
     await db.commit()
     return {"ok": True}

src/tracker/models/task.py

@@ -54,15 +54,12 @@ class Step(Base):
 
 
 class Label(Base):
-    """Project-scoped labels (like Jira)."""
+    """Global labels (app-wide)."""
     __tablename__ = "labels"
 
-    project_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("projects.id"), nullable=False)
-    name: Mapped[str] = mapped_column(String(100), nullable=False)
+    name: Mapped[str] = mapped_column(String(100), unique=True, nullable=False)
     color: Mapped[str] = mapped_column(String(7), default="#6366f1")  # hex color
 
-    project: Mapped["Project"] = relationship()
-
 
 class TaskLabel(Base):
     """Many-to-many: tasks ↔ labels."""