added api

backend/app/db/models.py

@@ -215,6 +215,16 @@ class FitnessReminder(Base):
     last_fired_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
 
 
+class AssistantState(Base):
+    __tablename__ = "assistant_state"
+
+    key: Mapped[str] = mapped_column(String(128), primary_key=True)
+    value: Mapped[str] = mapped_column(Text, default="")
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+
 class WorkItem(Base):
     __tablename__ = "work_items"