自动排队生成量化因子挖掘任务，心跳派发后将高 IC 因子入库。

Co-authored-by: Cursor <cursoragent@cursor.com>

app/services/tasks.py

@@ -24,6 +24,7 @@ from app.clock import utcnow
 from app.config import settings
 from app.errors import AppError
 from app.models import ComputeNode, ComputeTask, NodeStatus, PushStatus, TaskStatus
+from app.services.alpha_queue import ingest_alpha_factors
 from app.services.common import get_node_by_sn
 
 logger = logging.getLogger(__name__)
@@ -125,8 +126,15 @@ def dispatch_random_tasks(session: Session, now: datetime | None = None) -> list
     """向当前在线、授权仍有效、且没有未完成任务的节点随机下发一轮任务。"""
     moment = now or utcnow()
     expire_overdue_tasks(session, moment)
+    # 未绑定的挖掘切片不算占用节点。已派发的挖掘任务单独排队，不挡住模拟任务。
     pending_node_ids = set(
-        session.scalars(select(ComputeTask.node_id).where(ComputeTask.status.in_(_BUSY))).all()
+        session.scalars(
+            select(ComputeTask.node_id).where(
+                ComputeTask.node_id.is_not(None),
+                ComputeTask.status.in_(_BUSY),
+                ComputeTask.task_type != "alpha_mining",
+            )
+        ).all()
     )
     candidates = [
         node
@@ -174,15 +182,16 @@ def list_pending_tasks(session: Session, sn: str, now: datetime | None = None) -
     node = get_node_by_sn(session, sn.strip())
     tasks = session.scalars(
         select(ComputeTask)
-        .where(ComputeTask.node_id == node.id, ComputeTask.status == TaskStatus.PENDING)
-        .order_by(ComputeTask.dispatched_at)
+        .where(ComputeTask.node_id == node.id, ComputeTask.status.in_(_BUSY))
+        .order_by(ComputeTask.dispatched_at, ComputeTask.id)
     ).all()
     visible: list[ComputeTask] = []
     for task in tasks:
         if task.deadline_at < moment:
             task.status = TaskStatus.EXPIRED
             continue
-        task.status = TaskStatus.PROCESSING
+        if task.status == TaskStatus.PENDING:
+            task.status = TaskStatus.PROCESSING
         visible.append(task)
     session.flush()
     return visible
@@ -221,6 +230,8 @@ def report_task(
     task.result = result or None
     task.status = TaskStatus.COMPLETED if success else TaskStatus.FAILED
     session.flush()
+    if task.status == TaskStatus.COMPLETED and task.task_type == "alpha_mining":
+        ingest_alpha_factors(session, task)
     return task
 
 
@@ -228,6 +239,7 @@ def expire_overdue_tasks(session: Session, now: datetime | None = None) -> int:
     moment = now or utcnow()
     tasks = session.scalars(
         select(ComputeTask).where(
+            ComputeTask.node_id.is_not(None),
             ComputeTask.status.in_(_BUSY),
             ComputeTask.deadline_at < moment,
         )