Merge branch 'main' into dev

# Conflicts:
#	tests/test_migrations.py

web/backend/models.py

@@ -9,6 +9,7 @@ from sqlalchemy import (
     BigInteger,
     Boolean,
     ForeignKey,
+    Index,
     Integer,
     String,
     Text,
@@ -215,6 +216,24 @@ class DouyuTask(Base):
     created_by: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False)
     created_at: Mapped[datetime] = mapped_column(UTCDateTime, default=_utcnow)
     finished_at: Mapped[datetime | None] = mapped_column(UTCDateTime, nullable=True)
+    # 账号归属客服冗余字段，配合复合索引消除任务列表全表 filesort。
+    account_assigned_to: Mapped[int | None] = mapped_column(
+        ForeignKey("users.id"), nullable=True
+    )
+
+    __table_args__ = (
+        Index(
+            "ix_douyu_tasks_account_assigned_to_id",
+            "account_assigned_to",
+            "id",
+        ),
+        Index(
+            "ix_douyu_tasks_assigned_scope_id",
+            "account_assigned_to",
+            "handbook_scope",
+            "id",
+        ),
+    )
 
     account: Mapped[Account] = relationship("Account", back_populates="douyu_tasks")