C3: Add DELETE endpoint to sequences route (admin-only, soft-delete)

app/routes/sequences.py

@@ -1,4 +1,4 @@
-"""Sequence routes — list, create, update (admin only)."""
+"""Sequence routes — list, create, update, delete (admin only)."""
 
 from __future__ import annotations
 
@@ -83,3 +83,30 @@ async def update_sequence(
     if result is None:
         raise HTTPException(404, detail={"detail": "Sequence not found", "code": "not_found"})
     return result
+
+
+@router.delete("/{sequence_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_sequence(
+    sequence_id: str,
+    db: AsyncSession = Depends(get_db),
+    current_user: dict = Depends(get_current_user),
+):
+    """Delete a sequence (soft-delete). Admin only."""
+    tenant_id = uuid.UUID(current_user["tenant_id"])
+    user_id = uuid.UUID(current_user["user_id"])
+    role = current_user.get("role", "viewer")
+
+    if not check_permission(role, "settings", "delete"):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail={"detail": "Insufficient permissions", "code": "forbidden"},
+        )
+
+    try:
+        sid = uuid.UUID(sequence_id)
+    except ValueError:
+        raise HTTPException(400, detail={"detail": "Invalid sequence_id", "code": "invalid_id"}) from None
+
+    deleted = await sequence_service.delete_sequence(db, tenant_id, user_id, sid)
+    if not deleted:
+        raise HTTPException(404, detail={"detail": "Sequence not found", "code": "not_found"})