feat: доменный нейминг изменен

src/domain/subscription.py

@@ -1,22 +1,21 @@
 import uuid
 from typing import TYPE_CHECKING
 
-from sqlalchemy import BigInteger, ForeignKey
+from sqlalchemy import ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from src import domain
 
 if TYPE_CHECKING:
-    from .purchase import Purchase
+    from .placement import Placement
+    from .subscriber import Subscriber
 
 
 class Subscription(domain.Base):
-    """Подписка пользователя в целевой канал через конкретный закуп."""
-
-    purchase_id: Mapped[uuid.UUID] = mapped_column(ForeignKey('purchases.id'), index=True)
-    user_telegram_id: Mapped[int] = mapped_column(BigInteger, index=True)
-    username: Mapped[str | None]
+    placement_id: Mapped[uuid.UUID] = mapped_column(ForeignKey('placement.id'), index=True)
+    subscriber_id: Mapped[uuid.UUID] = mapped_column(ForeignKey('subscriber.id'), index=True)
     invite_link: Mapped[str] = mapped_column(index=True)  # По которой пришёл пользователь
 
-    # Relationship
-    purchase: Mapped['Purchase'] = relationship()
+    # Relationships
+    placement: Mapped['Placement'] = relationship(back_populates='subscriptions')
+    subscriber: Mapped['Subscriber'] = relationship(back_populates='subscriptions')