feat: add subscription and transaction repositories

- Implemented SubscriptionRepository with methods to get, create, and update subscriptions.
- Added BalanceTXRepository for creating and retrieving balance transactions.
- Introduced a test script for simulating Pally webhook for local testing.

db/models/bills.py

@@ -1,15 +1,22 @@
+from enum import StrEnum
 from typing import TYPE_CHECKING
 
 from sqlalchemy import BIGINT, INTEGER, Enum, ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from db.base import Base
-from misc.pally import BillStatus
 
 if TYPE_CHECKING:
     from db.models.users import User
 
 
+class DepositStatus(StrEnum):
+    PENDING = "pending"
+    SUCCESS = "success"
+    FAILED = "failed"
+    EXPIRED = "expired"
+
+
 class Bill(Base):
     __tablename__ = "bills"
 
@@ -18,8 +25,10 @@ class Bill(Base):
     )
     creator_id: Mapped[int] = mapped_column(BIGINT, ForeignKey("users.id"), nullable=False)
     amount: Mapped[int] = mapped_column(INTEGER, nullable=False)
-    status: Mapped[BillStatus] = mapped_column(
-        Enum(BillStatus), nullable=False, default=BillStatus.NEW
+    status: Mapped[DepositStatus] = mapped_column(
+        Enum(DepositStatus, name="depositstatus", values_callable=lambda x: [e.value for e in x]),
+        nullable=False,
+        default=DepositStatus.PENDING,
     )
 
     user: Mapped["User"] = relationship(