diff --git a/boxoffice/models/category.py b/boxoffice/models/category.py
index 51e8330e..cb0c8c57 100644
--- a/boxoffice/models/category.py
+++ b/boxoffice/models/category.py
@@ -6,11 +6,12 @@
 from uuid import UUID
 
 from . import BaseScopedNameMixin, Mapped, Model, relationship, sa
+from .user import User
 
 __all__ = ['Category']
 
 
-class Category(BaseScopedNameMixin, Model):
+class Category(BaseScopedNameMixin[int, User], Model):
     __tablename__ = 'category'
     __table_args__ = (
         sa.UniqueConstraint('item_collection_id', 'name'),
diff --git a/boxoffice/models/discount_policy.py b/boxoffice/models/discount_policy.py
index 886b5002..30f21cee 100644
--- a/boxoffice/models/discount_policy.py
+++ b/boxoffice/models/discount_policy.py
@@ -27,6 +27,7 @@
     sa,
 )
 from .enums import DiscountTypeEnum, LineItemStatus
+from .user import Organization, User
 
 __all__ = ['DiscountPolicy', 'DiscountCoupon', 'item_discount_policy']
 
@@ -49,7 +50,7 @@
 )
 
 
-class DiscountPolicy(BaseScopedNameMixin, Model):
+class DiscountPolicy(BaseScopedNameMixin[UUID, User], Model):
     """
     Consists of the discount rules applicable on tickets.
 
@@ -57,7 +58,6 @@ class DiscountPolicy(BaseScopedNameMixin, Model):
     """
 
     __tablename__ = 'discount_policy'
-    __uuid_primary_key__ = True
     __table_args__ = (
         sa.UniqueConstraint('organization_id', 'name'),
         sa.UniqueConstraint('organization_id', 'discount_code_base'),
@@ -305,9 +305,8 @@ def generate_coupon_code(size=6, chars=string.ascii_uppercase + string.digits):
     return ''.join(secrets.choice(chars) for _ in range(size))
 
 
-class DiscountCoupon(IdMixin, Model):
+class DiscountCoupon(IdMixin[UUID], Model):
     __tablename__ = 'discount_coupon'
-    __uuid_primary_key__ = True
     __table_args__ = (sa.UniqueConstraint('discount_policy_id', 'code'),)
 
     def __init__(self, *args, **kwargs):
@@ -370,4 +369,3 @@ class PolicyCoupon:
 
 if TYPE_CHECKING:
     from .item import Item, Price
-    from .user import Organization, User
diff --git a/boxoffice/models/invoice.py b/boxoffice/models/invoice.py
index 6db792f3..ae16a8ba 100644
--- a/boxoffice/models/invoice.py
+++ b/boxoffice/models/invoice.py
@@ -8,6 +8,7 @@
 
 from . import BaseMixin, Mapped, Model, UuidMixin, relationship, sa, timestamptz
 from .enums import InvoiceStatus
+from .user import Organization, User
 from .utils import get_fiscal_year
 
 __all__ = ['Invoice']
@@ -25,9 +26,8 @@ def gen_invoice_no(organization, jurisdiction, invoice_dt):
     )
 
 
-class Invoice(UuidMixin, BaseMixin, Model):
+class Invoice(UuidMixin, BaseMixin[UUID, User], Model):
     __tablename__ = 'invoice'
-    __uuid_primary_key__ = True
     __table_args__ = (
         sa.UniqueConstraint(
             'organization_id', 'fy_start_at', 'fy_end_at', 'invoice_no'
@@ -143,4 +143,3 @@ def validate_immutable_final_invoice(self, key, val):
 
 if TYPE_CHECKING:
     from .order import Order
-    from .user import Organization
diff --git a/boxoffice/models/item.py b/boxoffice/models/item.py
index 80318e90..efa8ecb0 100644
--- a/boxoffice/models/item.py
+++ b/boxoffice/models/item.py
@@ -29,13 +29,13 @@
 from .category import Category
 from .discount_policy import item_discount_policy
 from .enums import LineItemStatus
+from .user import User
 
 __all__ = ['Item', 'Price']
 
 
-class Item(BaseScopedNameMixin, Model):
+class Item(BaseScopedNameMixin[UUID, User], Model):
     __tablename__ = 'item'
-    __uuid_primary_key__ = True
     __table_args__ = (sa.UniqueConstraint('item_collection_id', 'name'),)
 
     description = MarkdownColumn('description', default='', nullable=False)
@@ -219,9 +219,8 @@ def demand_curve(self) -> Sequence[sa.engine.Row[tuple[Decimal, int]]]:
         ).fetchall()
 
 
-class Price(BaseScopedNameMixin, Model):
+class Price(BaseScopedNameMixin[UUID, User], Model):
     __tablename__ = 'price'
-    __uuid_primary_key__ = True
     __table_args__ = (
         sa.UniqueConstraint('item_id', 'name'),
         sa.CheckConstraint('start_at < end_at', 'price_start_at_lt_end_at_check'),
@@ -289,4 +288,3 @@ def tense(self):
 if TYPE_CHECKING:
     from .discount_policy import DiscountPolicy
     from .item_collection import ItemCollection
-    from .user import User
diff --git a/boxoffice/models/item_collection.py b/boxoffice/models/item_collection.py
index 8675c36a..03af8a1c 100644
--- a/boxoffice/models/item_collection.py
+++ b/boxoffice/models/item_collection.py
@@ -2,6 +2,7 @@
 
 from decimal import Decimal
 from typing import TYPE_CHECKING, cast
+from uuid import UUID
 
 from sqlalchemy.ext.orderinglist import ordering_list
 
@@ -17,17 +18,16 @@
 )
 from .enums import LineItemStatus, TransactionTypeEnum
 from .payment import PaymentTransaction
-from .user import Organization
+from .user import Organization, User
 from .utils import HeadersAndDataTuple
 
 __all__ = ['ItemCollection']
 
 
-class ItemCollection(BaseScopedNameMixin, Model):
+class ItemCollection(BaseScopedNameMixin[UUID, User], Model):
     """Represent a collection of tickets."""
 
     __tablename__ = 'item_collection'
-    __uuid_primary_key__ = True
     __table_args__ = (sa.UniqueConstraint('organization_id', 'name'),)
 
     description = MarkdownColumn('description', default='', nullable=False)
diff --git a/boxoffice/models/line_item.py b/boxoffice/models/line_item.py
index 1de6b8b0..5c076dd9 100644
--- a/boxoffice/models/line_item.py
+++ b/boxoffice/models/line_item.py
@@ -26,6 +26,7 @@
     timestamptz,
 )
 from .enums import LineItemStatus
+from .user import User
 
 __all__ = ['LineItem', 'Assignee']
 
@@ -46,7 +47,7 @@ class LineItemDict(TypedDict):
     ticket_id: str
 
 
-class Assignee(BaseMixin, Model):
+class Assignee(BaseMixin[int, User], Model):
     __tablename__ = 'assignee'
     __table_args__ = (
         sa.UniqueConstraint('line_item_id', 'current'),
@@ -67,7 +68,7 @@ class Assignee(BaseMixin, Model):
     current: Mapped[bool | None] = sa.orm.mapped_column()
 
 
-class LineItem(BaseMixin, Model):
+class LineItem(BaseMixin[UUID, User], Model):
     """
     A line item in a sale receipt.
 
@@ -76,7 +77,6 @@ class LineItem(BaseMixin, Model):
     """
 
     __tablename__ = 'line_item'
-    __uuid_primary_key__ = True
     __table_args__ = (
         sa.UniqueConstraint('customer_order_id', 'line_item_seq'),
         sa.UniqueConstraint('previous_id'),
@@ -393,4 +393,3 @@ def sales_delta(user_tz: tzinfo, ticket_ids: Sequence[str]):
     from .discount_policy import DiscountCoupon, DiscountPolicy
     from .item_collection import ItemCollection
     from .order import Order
-    from .user import User
diff --git a/boxoffice/models/line_item_discounter.py b/boxoffice/models/line_item_discounter.py
index 546a7e46..c9ba5510 100644
--- a/boxoffice/models/line_item_discounter.py
+++ b/boxoffice/models/line_item_discounter.py
@@ -6,8 +6,6 @@
 from uuid import UUID
 import itertools
 
-from beartype import beartype
-
 from .discount_policy import DiscountCoupon, DiscountPolicy, PolicyCoupon
 from .line_item import LineItemTuple
 
@@ -15,7 +13,6 @@
 
 
 class LineItemDiscounter:
-    @beartype
     def get_discounted_line_items(
         self,
         line_items: Sequence[LineItemTuple],
@@ -36,7 +33,6 @@ def get_discounted_line_items(
             return self.apply_discount(valid_discounts[0], line_items)
         return line_items
 
-    @beartype
     def get_valid_discounts(
         self, line_items: Sequence[LineItemTuple], coupons: Sequence[str]
     ) -> Sequence[PolicyCoupon]:
@@ -51,7 +47,6 @@ def get_valid_discounts(
 
         return DiscountPolicy.get_from_ticket(ticket, len(line_items), coupons)
 
-    @beartype
     def calculate_discounted_amount(
         self, discount_policy: DiscountPolicy, line_item: LineItemTuple
     ) -> Decimal:
@@ -73,11 +68,9 @@ def calculate_discounted_amount(
             return line_item.base_amount - discounted_price.amount
         return (discount_policy.percentage or 0) * line_item.base_amount / Decimal(100)
 
-    @beartype
     def is_coupon_usable(self, coupon: DiscountCoupon, applied_to_count: int) -> bool:
         return (coupon.usage_limit - coupon.used_count) > applied_to_count
 
-    @beartype
     def apply_discount(
         self,
         policy_coupon: PolicyCoupon,
@@ -134,7 +127,6 @@ def apply_discount(
                 discounted_line_items.append(line_item)
         return discounted_line_items
 
-    @beartype
     def apply_combo_discount(
         self,
         discounts: list[PolicyCoupon],
@@ -149,7 +141,6 @@ def apply_combo_discount(
             [discounts[0]], self.apply_combo_discount(discounts[1:], line_items)
         )
 
-    @beartype
     def apply_max_discount(
         self,
         discounts: list[PolicyCoupon | Sequence[PolicyCoupon]],
@@ -184,7 +175,6 @@ def apply_max_discount(
             ),
         )
 
-    @beartype
     def get_combos(
         self, discounts: list[PolicyCoupon], qty: int
     ) -> list[list[PolicyCoupon]]:
diff --git a/boxoffice/models/order.py b/boxoffice/models/order.py
index e6cf028a..deef53ff 100644
--- a/boxoffice/models/order.py
+++ b/boxoffice/models/order.py
@@ -4,7 +4,7 @@
 from decimal import Decimal
 from functools import partial
 from typing import TYPE_CHECKING
-from uuid import UUID, uuid4
+from uuid import UUID
 import secrets
 
 from sqlalchemy.ext.orderinglist import ordering_list
@@ -24,6 +24,7 @@
 )
 from .enums import LineItemStatus, OrderStatus, TransactionTypeEnum
 from .line_item import LineItem
+from .user import Organization, User
 
 __all__ = ['Order', 'OrderSession']
 
@@ -42,17 +43,13 @@ def gen_receipt_no(organization):
     )
 
 
-class Order(BaseMixin, Model):
+class Order(BaseMixin[UUID, User], Model):
     __tablename__ = 'customer_order'
-    __uuid_primary_key__ = True
     __table_args__ = (
         sa.UniqueConstraint('organization_id', 'invoice_no'),
         sa.UniqueConstraint('access_token'),
     )
 
-    id: Mapped[UUID] = sa.orm.mapped_column(  # type: ignore[assignment]  # noqa: A003
-        primary_key=True, default=uuid4
-    )
     user_id: Mapped[int | None] = sa.orm.mapped_column(sa.ForeignKey('user.id'))
     user: Mapped[User | None] = relationship(back_populates='orders')
     menu_id: Mapped[UUID] = sa.orm.mapped_column(
@@ -99,8 +96,8 @@ class Order(BaseMixin, Model):
 
     confirmed_line_items: DynamicMapped[LineItem] = relationship(
         lazy='dynamic',
-        primaryjoin=sa.and_(
-            LineItem.customer_order_id == id,
+        primaryjoin=lambda: sa.and_(
+            LineItem.customer_order_id == Order.id,
             LineItem.status == LineItemStatus.CONFIRMED,
         ),
         viewonly=True,
@@ -108,8 +105,8 @@ class Order(BaseMixin, Model):
 
     confirmed_and_cancelled_line_items: DynamicMapped[LineItem] = relationship(
         lazy='dynamic',
-        primaryjoin=sa.and_(
-            LineItem.customer_order_id == id,
+        primaryjoin=lambda: sa.and_(
+            LineItem.customer_order_id == Order.id,
             LineItem.status.in_(
                 [LineItemStatus.CONFIRMED.value, LineItemStatus.CANCELLED.value]
             ),
@@ -119,8 +116,8 @@ class Order(BaseMixin, Model):
 
     initial_line_items: DynamicMapped[LineItem] = relationship(
         lazy='dynamic',
-        primaryjoin=sa.and_(
-            LineItem.customer_order_id == id,
+        primaryjoin=lambda: sa.and_(
+            LineItem.customer_order_id == Order.id,
             LineItem.previous_id.is_(None),
             LineItem.status.in_(
                 [
@@ -221,11 +218,10 @@ def net_amount(self) -> Decimal:
         return self.paid_amount - self.refunded_amount
 
 
-class OrderSession(BaseMixin, Model):
+class OrderSession(BaseMixin[UUID, User], Model):
     """Records the referrer and utm headers for an order."""
 
     __tablename__ = 'order_session'
-    __uuid_primary_key__ = True
 
     customer_order_id: Mapped[UUID] = sa.orm.mapped_column(
         sa.ForeignKey('customer_order.id'), index=True, unique=False
@@ -256,4 +252,3 @@ class OrderSession(BaseMixin, Model):
     from .invoice import Invoice
     from .item_collection import ItemCollection
     from .payment import OnlinePayment, PaymentTransaction
-    from .user import Organization, User
diff --git a/boxoffice/models/payment.py b/boxoffice/models/payment.py
index 9d436659..74fe12ab 100644
--- a/boxoffice/models/payment.py
+++ b/boxoffice/models/payment.py
@@ -25,15 +25,15 @@
     TransactionMethodEnum,
     TransactionTypeEnum,
 )
+from .user import User
 
 __all__ = ['OnlinePayment', 'PaymentTransaction']
 
 
-class OnlinePayment(BaseMixin, Model):
+class OnlinePayment(BaseMixin[UUID, User], Model):
     """Represents payments made through a payment gateway. Supports Razorpay only."""
 
     __tablename__ = 'online_payment'
-    __uuid_primary_key__ = True
     customer_order_id: Mapped[UUID] = sa.orm.mapped_column(
         sa.ForeignKey('customer_order.id')
     )
@@ -60,7 +60,7 @@ def fail(self) -> None:
         self.failed_at = func.utcnow()
 
 
-class PaymentTransaction(BaseMixin, Model):
+class PaymentTransaction(BaseMixin[UUID, User], Model):
     """
     Models transactions made by a customer.
 
@@ -68,7 +68,6 @@ class PaymentTransaction(BaseMixin, Model):
     """
 
     __tablename__ = 'payment_transaction'
-    __uuid_primary_key__ = True
 
     customer_order_id: Mapped[UUID] = sa.orm.mapped_column(
         sa.ForeignKey('customer_order.id')
diff --git a/boxoffice/models/user.py b/boxoffice/models/user.py
index 18ec218d..bab1132d 100644
--- a/boxoffice/models/user.py
+++ b/boxoffice/models/user.py
@@ -84,6 +84,8 @@ def permissions(self, actor, inherited=None):
 
     def fetch_invoices(self):
         """Return invoices for an organization as a tuple of (row_headers, rows)."""
+        from .order import Order  # pylint: disable=import-outside-toplevel
+
         headers = [
             'order_id',
             'receipt_no',
@@ -135,9 +137,10 @@ def fetch_invoices(self):
 
 # Tail imports
 from .invoice import Invoice  # isort:skip
-from .order import Order  # isort:skip
+
 
 if TYPE_CHECKING:
     from .discount_policy import DiscountPolicy
     from .item_collection import ItemCollection
     from .line_item import Assignee
+    from .order import Order
diff --git a/requirements.txt b/requirements.txt
index 9f341de5..406e889b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
 git+https://github.com/hasgeek/baseframe#egg=baseframe
-beartype
 click
 git+https://github.com/hasgeek/coaster#egg=coaster
 Flask