feat(link_codes): linking method between telegram and website

db/models/link_codes.py

@@ -0,0 +1,28 @@
+from datetime import UTC, datetime
+
+from sqlalchemy import TEXT, DateTime, Enum, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column
+
+from db.base import Base
+from schemas.enums import LinkCodeStatus
+
+
+class LinkCode(Base):
+    __tablename__ = "link_codes"
+
+    code: Mapped[str] = mapped_column(TEXT, nullable=False, unique=True, primary_key=True)
+    user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False)
+    status: Mapped[LinkCodeStatus] = mapped_column(
+        Enum(LinkCodeStatus, name="linkcodestatus"), nullable=False, default=LinkCodeStatus.ACTIVE
+    )
+
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        nullable=False,
+        default=lambda: datetime.now(UTC),
+    )
+    expires_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        nullable=False,
+    )
+    used_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=True)