i think most of this works lole

app/schemas/transaction.py

@@ -0,0 +1,49 @@
+from typing import List, Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+class PurchaseItem(BaseModel):
+    product_id: int
+    unit_price: float
+    quantity: int
+    is_case: bool
+    num_boxes: Optional[int] = None
+    # TODO: remove is_case and num_boxes, should derive from product_id
+
+class SaleItem(BaseModel):
+    inventory_item_id: int
+    unit_price: float
+
+class PurchaseTransactionCreate(BaseModel):
+    vendor_id: int
+    transaction_date: datetime
+    items: List[PurchaseItem]
+    transaction_notes: Optional[str] = None
+
+class SaleTransactionCreate(BaseModel):
+    customer_id: int
+    marketplace_id: Optional[int] = None
+    transaction_date: datetime
+    items: List[SaleItem]
+    transaction_notes: Optional[str] = None
+
+class TransactionItemResponse(BaseModel):
+    id: int
+    transaction_id: int
+    physical_item_id: int
+    unit_price: float
+    created_at: datetime
+    updated_at: datetime
+
+class TransactionResponse(BaseModel):
+    id: int
+    vendor_id: Optional[int] = None
+    customer_id: Optional[int] = None
+    marketplace_id: Optional[int] = None
+    transaction_type: str
+    transaction_date: datetime
+    transaction_total_amount: float
+    transaction_notes: Optional[str] = None
+    created_at: datetime
+    updated_at: datetime
+    transaction_items: List[TransactionItemResponse]