added reminder

backend/app/db/models.py

@@ -251,6 +251,25 @@ class ShoppingListItem(Base):
     shopping_list: Mapped["ShoppingList"] = relationship(back_populates="items")
 
 
+class Reminder(Base):
+    __tablename__ = "reminders"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    title: Mapped[str] = mapped_column(String(255))
+    notes: Mapped[str] = mapped_column(Text, default="")
+    due_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), index=True)
+    all_day: Mapped[bool] = mapped_column(Boolean, default=False)
+    recurrence: Mapped[str] = mapped_column(String(16), default="none")
+    enabled: Mapped[bool] = mapped_column(Boolean, default=True, index=True)
+    last_fired_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    timezone: Mapped[str] = mapped_column(String(64), default="Europe/Moscow")
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+
 class AssistantState(Base):
     __tablename__ = "assistant_state"