chore(django): fail fast with hint when pipeline 0012/0013 migration files missing

Made-with: Cursor

backend/manage.py

@@ -2,11 +2,34 @@
 """Django's command-line utility for administrative tasks."""
 import os
 import sys
+from pathlib import Path
+
+
+def _require_pipeline_migration_files() -> None:
+    """0013 依赖 0012；缺文件时 MigrationLoader 报 NodeNotFoundError，此处给出可操作的提示。"""
+    base = Path(__file__).resolve().parent
+    required = (
+        base / "pipeline" / "migrations" / "0012_job_pause_checkpoint.py",
+        base / "pipeline" / "migrations" / "0013_rebuild_pipelinejobcheckpoint.py",
+    )
+    missing = [p for p in required if not p.is_file()]
+    if not missing:
+        return
+    print(
+        "Missing pipeline migration file(s) (clone/pull 不完整或误删):\n"
+        + "\n".join(f"  - {p}" for p in missing)
+        + "\n\nRestore from Git, e.g.\n"
+        "  git checkout HEAD -- pipeline/migrations/0012_job_pause_checkpoint.py "
+        "pipeline/migrations/0013_rebuild_pipelinejobcheckpoint.py\n",
+        file=sys.stderr,
+    )
+    sys.exit(1)
 
 
 def main():
     """Run administrative tasks."""
     os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'config.settings')
+    _require_pipeline_migration_files()
     try:
         from django.core.management import execute_from_command_line
     except ImportError as exc: