feat: 静态通知同步 + 积分审计 JSONB 序列化修复

backend/src/models/notification.py

@@ -31,6 +31,13 @@ class Notification(TimestampMixin, SoftDeleteMixin, Base):
             "ix_notifications_published_at",
             "published_at",
         ),
+        Index(
+            "uq_notifications_source_source_key",
+            "source",
+            "source_key",
+            unique=True,
+            postgresql_where=text("source_key IS NOT NULL"),
+        ),
     )
 
     id: Mapped[uuid.UUID] = mapped_column(
@@ -39,6 +46,12 @@ class Notification(TimestampMixin, SoftDeleteMixin, Base):
     type: Mapped[str] = mapped_column(
         String(32), nullable=False, server_default=text("'system'")
     )
+    source: Mapped[str] = mapped_column(
+        String(32), nullable=False, server_default=text("'manual'")
+    )
+    source_key: Mapped[str | None] = mapped_column(String(128), nullable=True)
+    source_version: Mapped[int | None] = mapped_column(nullable=True)
+    content_hash: Mapped[str | None] = mapped_column(String(64), nullable=True)
     title: Mapped[str] = mapped_column(Text, nullable=False)
     body: Mapped[str] = mapped_column(Text, nullable=False)
     payload: Mapped[dict[str, object]] = mapped_column(