init commit

backend/app/models/transactions.py

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+from uuid import UUID
+from uuid import uuid4
+
+from sqlalchemy import BigInteger
+from sqlalchemy import Column
+from sqlalchemy import ForeignKey
+from sqlmodel import Field
+from sqlmodel import Relationship
+from sqlmodel import SQLModel
+
+from app.models.item import Item
+from app.models.user import User
+
+
+class BaseTransaction(SQLModel):
+    title: str = Field(nullable=False)
+
+
+class Transaction(BaseTransaction, table=True):
+    id: UUID = Field(default_factory=uuid4, primary_key=True)
+    payer_id: int = Field(
+        sa_column=Column(BigInteger(), ForeignKey('user.id'))
+    )
+    payer: User = Relationship(back_populates='transactions')
+    event_id: UUID = Field(foreign_key='event.id')
+    event: 'Event' = Relationship(back_populates='transactions')
+    closed: bool = Field(nullable=False, default=False)
+    items: list['Item'] = Relationship(back_populates='transaction')
+
+    async def add_participant(self, participant: User):
+        self.participants.append(participant)
+
+    async def add_item(self, item: Item):
+        self.items.append(item)
+
+
+class OutputTransaction(BaseTransaction):
+    id: UUID
+    payer: User
+    event_id: UUID
+    closed: bool
+    items: list['Item']