perf: SQLite WAL + 复合索引 + GZip + scheduler jitter + 构建缓存

backend/app/models/notification_log.py

@@ -1,6 +1,6 @@
 from datetime import datetime, timezone
 from typing import Optional
-from sqlalchemy import Integer, String, DateTime, Text, ForeignKey
+from sqlalchemy import Index, Integer, String, DateTime, Text, ForeignKey, text
 from sqlalchemy.orm import mapped_column, Mapped
 from app.database import Base
 
@@ -19,3 +19,8 @@ class NotificationLog(Base):
     status: Mapped[str] = mapped_column(String(16), nullable=False)
     response_text: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(timezone.utc), index=True)
+
+    __table_args__ = (
+        Index("ix_notif_event_created", "event_type", text("created_at DESC")),
+        Index("ix_notif_status_created", "status", text("created_at DESC")),
+    )