Implement group duty pinning and user phone management

- Added functionality to pin duty messages in group chats, including scheduling updates and handling bot add/remove events.
- Introduced a new `GroupDutyPin` model to store pinned message details and a `phone` field in the `User` model for user contact information.
- Implemented commands for users to set or clear their phone numbers in private chats.
- Enhanced the repository with functions to manage group duty pins and user phone data.
- Updated handlers to register new commands and manage duty pin updates effectively.

db/models.py

@@ -21,6 +21,7 @@ class User(Base):
     username: Mapped[str | None] = mapped_column(Text, nullable=True)
     first_name: Mapped[str | None] = mapped_column(Text, nullable=True)
     last_name: Mapped[str | None] = mapped_column(Text, nullable=True)
+    phone: Mapped[str | None] = mapped_column(Text, nullable=True)
 
     duties: Mapped[list["Duty"]] = relationship("Duty", back_populates="user")
 
@@ -39,3 +40,12 @@ class Duty(Base):
     event_type: Mapped[str] = mapped_column(Text, nullable=False, server_default="duty")
 
     user: Mapped["User"] = relationship("User", back_populates="duties")
+
+
+class GroupDutyPin(Base):
+    """Stores which message to update in each group for the pinned duty notice."""
+
+    __tablename__ = "group_duty_pins"
+
+    chat_id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
+    message_id: Mapped[int] = mapped_column(Integer, nullable=False)