remodeling table models and migration to postgres

backend/app/schemas/base.py

@@ -0,0 +1,26 @@
+from sqlmodel import SQLModel
+from enum import Enum
+
+
+class UserRole(str, Enum):
+    ADMIN = "admin"
+    WRITE = "write"
+    READ_ONLY = "read_only"
+
+
+class TransactionType(str, Enum):
+    SALE = "sell"
+    PURCHASE = "buy"
+    CREDIT = "credit"
+
+
+class TransactionStatus(str, Enum):
+    UNPAID = "unpaid"
+    PARTIALLY_PAID = "partially_paid"
+    PAID = "paid"
+    CANCELLED = 'cancelled'
+
+
+class PartnerType(str, Enum):
+    CLIENT = "client"
+    SUPPLIER = "supplier"