feat: 统一生产初始化流程并保护系统管理员

backend/tests/test_study_delete.py

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+import uuid
+
+import pytest
+
+from app.crud import study as study_crud
+
+
+class _FakeDb:
+    def __init__(self):
+        self.tables = []
+        self.committed = False
+
+    async def execute(self, stmt):
+        table = getattr(getattr(stmt, "table", None), "name", None)
+        if table:
+            self.tables.append(table)
+
+    async def commit(self):
+        self.committed = True
+
+
+@pytest.mark.asyncio
+async def test_delete_study_removes_contract_fee_payments_before_contract_fees():
+    db = _FakeDb()
+
+    await study_crud.delete(db, uuid.uuid4())
+
+    assert "contract_fee_payments" in db.tables
+    assert "contract_fees" in db.tables
+    assert db.tables.index("contract_fee_payments") < db.tables.index("contract_fees")
+    assert db.committed is True