feat: implement billing system with Pally integration

- Added billing models and repository for handling bills.
- Introduced BillingService to manage payment initiation and bill creation.
- Updated user service to remove ticket-related functionality.
- Refactored settings to include new billing-related fields.
- Removed ticket-related handlers and schemas.
- Added new billing handlers for processing payments.
- Updated database schema with new bills table and status enum.
- Enhanced utility functions to calculate prices considering discounts.
- Introduced prehandling for non-private messages.
- Updated main application to initialize new billing services and repositories.

db/models/__init__.py

@@ -1,4 +1,4 @@
-from .tickets import Ticket
+from .bills import Bill
 from .users import User
 
-__all__ = ["Ticket", "User"]
+__all__ = ["Bill", "User"]

db/models/bills.py

@@ -0,0 +1,28 @@
+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 Bill(Base):
+    __tablename__ = "bills"
+
+    id: Mapped[int] = mapped_column(
+        BIGINT, autoincrement=True, unique=True, nullable=False, primary_key=True
+    )
+    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
+    )
+
+    user: Mapped["User"] = relationship(
+        "User",
+        back_populates="bills",
+    )

db/models/tickets.py

@@ -1,25 +0,0 @@
-from enum import Enum as VanillaEnum
-
-from sqlalchemy import BIGINT, INTEGER, Enum
-from sqlalchemy.orm import Mapped, mapped_column
-
-from db.base import Base
-
-
-class TicketStatus(VanillaEnum):
-    OPEN = "OPEN"
-    CLOSED = "CLOSED"
-    PENDING = "PENDING"
-
-
-class Ticket(Base):
-    __tablename__ = "tickets"
-
-    id: Mapped[int] = mapped_column(
-        INTEGER, autoincrement=True, unique=True, nullable=False, primary_key=True
-    )
-    creator_id: Mapped[int] = mapped_column(BIGINT, nullable=False)
-    status: Mapped[TicketStatus] = mapped_column(
-        Enum(TicketStatus), nullable=False, default=TicketStatus.PENDING
-    )
-    thread_id: Mapped[int] = mapped_column(BIGINT, nullable=True, unique=True)

db/models/users.py

@@ -1,8 +1,13 @@
+from typing import TYPE_CHECKING
+
 from sqlalchemy import BIGINT, INTEGER, TEXT
-from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from db.base import Base
 
+if TYPE_CHECKING:
+    from db.models.bills import Bill
+
 
 class User(Base):
     __tablename__ = "users"
@@ -11,3 +16,9 @@ class User(Base):
     referal_id: Mapped[int] = mapped_column(BIGINT, nullable=True)
     subscription_link: Mapped[str] = mapped_column(TEXT, nullable=True, unique=True)
     balance: Mapped[int] = mapped_column(INTEGER, nullable=False, default=0)
+
+    bills: Mapped[list["Bill"]] = relationship(
+        "Bill",
+        back_populates="user",
+        cascade="all, delete",
+    )