Adding auto creation of opening transaction on create

api/app/transaction/models.py

@@ -1,4 +1,5 @@
 from decimal import Decimal
+from typing import Optional
 from uuid import UUID, uuid4
 
 from sqlmodel import Field, SQLModel, select, Relationship
@@ -50,7 +51,7 @@ class Transaction(TransactionBaseId, table=True):
 
 class SplitBase(SQLModel):
     account_id: UUID = Field(foreign_key="account.id")
-    payee_id: UUID = Field(foreign_key="payee.id")
+    payee_id: Optional[UUID] = Field(foreign_key="payee.id")
     amount: Decimal = Field(decimal_places=2)
 
 class SplitBaseId(SplitBase):
@@ -74,7 +75,7 @@ class SplitWrite(SplitBase):
             }
         }
     })
-    payee_id: UUID = PydField(json_schema_extra={
+    payee_id: UUID | None = PydField(json_schema_extra={
         "foreign_key": {
             "reference": {
                 "resource": "payees",