Updates:

- Restructure table models
- Remove React/Next.js frontend (in favor of HTMX)

backend/app/schemas/base.py

@@ -1,26 +1,62 @@
 from sqlmodel import SQLModel
 from enum import Enum
 
-
 class UserRole(str, Enum):
+    """User roles for system access.
+
+    Attributes:
+        ADMIN (str): Administrator with full access.
+        WRITE (str): User with write permissions.
+        READ_ONLY (str): User with read-only permissions.
+    """
     ADMIN = "admin"
     WRITE = "write"
     READ_ONLY = "read_only"
 
-
 class TransactionType(str, Enum):
+    """Types of financial transactions.
+
+    Attributes:
+        SALE (str): Sale transaction.
+        PURCHASE (str): Purchase transaction.
+        CREDIT (str): Credit transaction.
+    """
     SALE = "sell"
     PURCHASE = "buy"
     CREDIT = "credit"
 
-
 class TransactionStatus(str, Enum):
+    """Possible statuses of a transaction.
+
+    Attributes:
+        UNPAID (str): Transaction not paid.
+        PARTIALLY_PAID (str): Transaction partially paid.
+        PAID (str): Transaction fully paid.
+        CANCELLED (str): Transaction cancelled.
+    """
     UNPAID = "unpaid"
     PARTIALLY_PAID = "partially_paid"
     PAID = "paid"
     CANCELLED = 'cancelled'
 
-
 class PartnerType(str, Enum):
+    """Types of business partners.
+
+    Attributes:
+        CLIENT (str): Client partner.
+        SUPPLIER (str): Supplier partner.
+    """
     CLIENT = "client"
     SUPPLIER = "supplier"
+
+class PaymentMethod(str, Enum):
+    """Payment methods available.
+
+    Attributes:
+        MOMO (str): Mobile money.
+        BANK (str): Bank transfer.
+        CASH (str): Cash payment.
+    """
+    MOMO = "momo"
+    BANK = "bank"
+    CASH = "cash"