first commit

app/models/__init__.py

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+from app.models.user import User
+
+__all__ = ("User",)

app/models/user.py

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+from __future__ import annotations
+
+from datetime import datetime
+from typing import Optional
+
+from sqlalchemy import BigInteger, DateTime, ForeignKey, String, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    telegram_id: Mapped[int] = mapped_column(BigInteger, unique=True, index=True)
+    username: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
+    first_name: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+    )
+    referrer_id: Mapped[Optional[int]] = mapped_column(
+        ForeignKey("users.id", ondelete="SET NULL"),
+        nullable=True,
+        index=True,
+    )
+
+    referrer: Mapped[Optional[User]] = relationship(
+        back_populates="referrals",
+        remote_side="User.id",
+    )
+    referrals: Mapped[list[User]] = relationship(
+        back_populates="referrer",
+    )