M1：镜生域后端闭环——灵胚/照心试演/启镜原子闸门/执镜关系/命台租约/魂籍签名导出/死亡冷静期（迁移 001，测试 7 用例）

backend/app/models/character.py

@@ -41,3 +41,13 @@ class Character(Base):
     )
     activated_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
     archived_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    # ── rewrite/1.0 镜生域增量列（data-model.md §1）：来源、道体锚点、死亡与冷静期 ──
+    source: Mapped[str] = mapped_column(
+        String(40), nullable=False, default="original", server_default="original", index=True
+    )
+    identity_baseline_json: Mapped[str] = mapped_column(
+        Text, nullable=False, default="{}", server_default="{}"
+    )
+    death_requested_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    calm_period_until: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    died_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))