diff --git a/corepos/db/common/__init__.py b/corepos/db/common/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/corepos/db/common/op.py b/corepos/db/common/op.py
deleted file mode 100644
index 7cf84fc..0000000
--- a/corepos/db/common/op.py
+++ /dev/null
@@ -1,56 +0,0 @@
-# -*- coding: utf-8; -*-
-################################################################################
-#
-#  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
-#
-#  This file is part of pyCOREPOS.
-#
-#  pyCOREPOS is free software: you can redistribute it and/or modify it under
-#  the terms of the GNU General Public License as published by the Free
-#  Software Foundation, either version 3 of the License, or (at your option)
-#  any later version.
-#
-#  pyCOREPOS is distributed in the hope that it will be useful, but WITHOUT ANY
-#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-#  details.
-#
-#  You should have received a copy of the GNU General Public License along with
-#  pyCOREPOS.  If not, see <http://www.gnu.org/licenses/>.
-#
-################################################################################
-"""
-Common schema for operational data models
-"""
-
-import sqlalchemy as sa
-
-
-class EmployeeBase:
-    """
-    Base class for Employee models, shared by Office + Lane.
-    """
-    number = sa.Column('emp_no', sa.SmallInteger(), nullable=False,
-                       primary_key=True, autoincrement=False)
-
-    cashier_password = sa.Column('CashierPassword', sa.String(length=50), nullable=True)
-
-    admin_password = sa.Column('AdminPassword', sa.String(length=50), nullable=True)
-
-    first_name = sa.Column('FirstName', sa.String(length=255), nullable=True)
-
-    last_name = sa.Column('LastName', sa.String(length=255), nullable=True)
-
-    job_title = sa.Column('JobTitle', sa.String(length=255), nullable=True)
-
-    active = sa.Column('EmpActive', sa.Boolean(), nullable=True)
-
-    frontend_security = sa.Column('frontendsecurity', sa.SmallInteger(), nullable=True)
-
-    backend_security = sa.Column('backendsecurity', sa.SmallInteger(), nullable=True)
-
-    birth_date = sa.Column('birthdate', sa.DateTime(), nullable=True)
-
-    def __str__(self):
-        return ' '.join([self.first_name or '', self.last_name or '']).strip()
diff --git a/corepos/db/common/trans.py b/corepos/db/common/trans.py
deleted file mode 100644
index 2b4e503..0000000
--- a/corepos/db/common/trans.py
+++ /dev/null
@@ -1,123 +0,0 @@
-# -*- coding: utf-8; -*-
-################################################################################
-#
-#  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
-#
-#  This file is part of pyCOREPOS.
-#
-#  pyCOREPOS is free software: you can redistribute it and/or modify it under
-#  the terms of the GNU General Public License as published by the Free
-#  Software Foundation, either version 3 of the License, or (at your option)
-#  any later version.
-#
-#  pyCOREPOS is distributed in the hope that it will be useful, but WITHOUT ANY
-#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-#  details.
-#
-#  You should have received a copy of the GNU General Public License along with
-#  pyCOREPOS.  If not, see <http://www.gnu.org/licenses/>.
-#
-################################################################################
-"""
-Common schema for transaction data models
-"""
-
-import sqlalchemy as sa
-from sqlalchemy import orm
-from sqlalchemy.ext.declarative import declared_attr
-
-
-class TransactionDetailBase:
-    """
-    Base class for POS transaction detail models, shared by Office +
-    Lane.
-    """
-
-    # register
-    register_number = sa.Column('register_no', sa.Integer(), nullable=True)
-
-    # txn
-    transaction_id = sa.Column('trans_id', sa.Integer(), nullable=True)
-    transaction_number = sa.Column('trans_no', sa.Integer(), nullable=True)
-    transaction_type = sa.Column('trans_type', sa.String(length=1), nullable=True)
-    transaction_subtype = sa.Column('trans_subtype', sa.String(length=2), nullable=True)
-    trans_status = sa.Column(sa.String(length=1), nullable=True)
-
-    @declared_attr
-    def transaction_status(self):
-        return orm.synonym('trans_status')
-
-    # cashier
-    employee_number = sa.Column('emp_no', sa.Integer(), nullable=True)
-
-    # customer
-    card_number = sa.Column('card_no', sa.Integer(), nullable=True)
-    member_type = sa.Column('memType', sa.Integer(), nullable=True)
-    staff = sa.Column(sa.Boolean(), nullable=True)
-
-    ##############################
-    # remainder is "line item" ...
-    ##############################
-
-    upc = sa.Column(sa.String(length=13), nullable=True)
-
-    department_number = sa.Column('department', sa.Integer(), nullable=True)
-
-    description = sa.Column(sa.String(length=30), nullable=True)
-
-    quantity = sa.Column(sa.Float(), nullable=True)
-
-    scale = sa.Column(sa.Boolean(), nullable=True, default=False)
-
-    cost = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    unitPrice = sa.Column('unitPrice', sa.Numeric(precision=10, scale=2), nullable=True)
-
-    @declared_attr
-    def unit_price(self):
-        return orm.synonym('unitPrice')
-
-    total = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    reg_price = sa.Column('regPrice', sa.Numeric(precision=10, scale=2), nullable=True)
-
-    tax = sa.Column(sa.SmallInteger(), nullable=True)
-
-    @declared_attr
-    def tax_rate_id(self):
-        return orm.synonym('tax')
-
-    food_stamp = sa.Column('foodstamp', sa.Boolean(), nullable=True)
-
-    discount = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    member_discount = sa.Column('memDiscount', sa.Numeric(precision=10, scale=2), nullable=True)
-
-    discountable = sa.Column(sa.Boolean(), nullable=True)
-
-    discount_type = sa.Column('discounttype', sa.Integer(), nullable=True)
-
-    voided = sa.Column(sa.Integer(), nullable=True)
-
-    percent_discount = sa.Column('percentDiscount', sa.Integer(), nullable=True)
-
-    item_quantity = sa.Column('ItemQtty', sa.Float(), nullable=True)
-
-    volume_discount_type = sa.Column('volDiscType', sa.Integer(), nullable=True)
-
-    volume = sa.Column(sa.Integer(), nullable=True)
-
-    volume_special = sa.Column('VolSpecial', sa.Numeric(precision=10, scale=2), nullable=True)
-
-    mix_match = sa.Column('mixMatch', sa.String(length=13), nullable=True)
-
-    matched = sa.Column(sa.Boolean(), nullable=True)
-
-    num_flag = sa.Column('numflag', sa.Integer(), nullable=True, default=0)
-
-    char_flag = sa.Column('charflag', sa.String(length=2), nullable=True)
-
-    def __str__(self):
-        return self.description or ''
diff --git a/corepos/db/lane_op/model.py b/corepos/db/lane_op/model.py
index 08da4f2..c7ed5b2 100644
--- a/corepos/db/lane_op/model.py
+++ b/corepos/db/lane_op/model.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
+#  Copyright © 2018-2023 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -27,19 +27,10 @@ Data model for CORE POS "lane_op" DB
 import sqlalchemy as sa
 from sqlalchemy import orm
 
-from corepos.db.common import op as common
-
 
 Base = orm.declarative_base()
 
 
-class Employee(common.EmployeeBase, Base):
-    """
-    Data model for ``employees`` table.
-    """
-    __tablename__ = 'employees'
-
-
 class Department(Base):
     """
     Represents a department within the organization.
diff --git a/corepos/db/lane_trans/__init__.py b/corepos/db/lane_trans/__init__.py
deleted file mode 100644
index 8e8c706..0000000
--- a/corepos/db/lane_trans/__init__.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# -*- coding: utf-8; -*-
-################################################################################
-#
-#  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
-#
-#  This file is part of pyCOREPOS.
-#
-#  pyCOREPOS is free software: you can redistribute it and/or modify it under
-#  the terms of the GNU General Public License as published by the Free
-#  Software Foundation, either version 3 of the License, or (at your option)
-#  any later version.
-#
-#  pyCOREPOS is distributed in the hope that it will be useful, but WITHOUT ANY
-#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-#  details.
-#
-#  You should have received a copy of the GNU General Public License along with
-#  pyCOREPOS.  If not, see <http://www.gnu.org/licenses/>.
-#
-################################################################################
-"""
-Lane Transaction Database
-"""
-
-from sqlalchemy import orm
-
-
-Session = orm.sessionmaker()
diff --git a/corepos/db/lane_trans/model.py b/corepos/db/lane_trans/model.py
deleted file mode 100644
index b656d8f..0000000
--- a/corepos/db/lane_trans/model.py
+++ /dev/null
@@ -1,62 +0,0 @@
-# -*- coding: utf-8; -*-
-################################################################################
-#
-#  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
-#
-#  This file is part of pyCOREPOS.
-#
-#  pyCOREPOS is free software: you can redistribute it and/or modify it under
-#  the terms of the GNU General Public License as published by the Free
-#  Software Foundation, either version 3 of the License, or (at your option)
-#  any later version.
-#
-#  pyCOREPOS is distributed in the hope that it will be useful, but WITHOUT ANY
-#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-#  details.
-#
-#  You should have received a copy of the GNU General Public License along with
-#  pyCOREPOS.  If not, see <http://www.gnu.org/licenses/>.
-#
-################################################################################
-"""
-Data model for CORE POS "lane_trans" DB
-"""
-
-import sqlalchemy as sa
-from sqlalchemy import orm
-
-from corepos.db.common import trans as common
-
-
-Base = orm.declarative_base()
-
-
-class DTransactionBase(common.TransactionDetailBase):
-    """
-    Base class for ``dtransactions`` and similar models.
-    """
-    pos_row_id = sa.Column(sa.Integer(), primary_key=True, nullable=False)
-
-    store_id = sa.Column(sa.Integer(), nullable=True, default=0)
-    date_time = sa.Column('datetime', sa.DateTime(), nullable=True)
-
-
-class DTransaction(DTransactionBase, Base):
-    """
-    Represents a record from ``dtransactions`` table.
-    """
-    __tablename__ = 'dtransactions'
-
-
-class LocalTempTrans(common.TransactionDetailBase, Base):
-    """
-    Represents a record from ``localtemptrans`` table.
-    """
-    __tablename__ = 'localtemptrans'
-    __table_args__ = (
-        sa.PrimaryKeyConstraint('trans_id'),
-    )
-
-    date_time = sa.Column('datetime', sa.DateTime(), nullable=True)
diff --git a/corepos/db/office_arch/model.py b/corepos/db/office_arch/model.py
index bc5838f..49b0bbd 100644
--- a/corepos/db/office_arch/model.py
+++ b/corepos/db/office_arch/model.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
+#  Copyright © 2018-2024 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -24,11 +24,9 @@
 CORE Office "arch" data model
 """
 
-import sqlalchemy as sa
 from sqlalchemy import orm
 
-from corepos.db.common import trans as common
-from corepos.db.office_trans.model import DTransactionBase
+from corepos.db.office_trans.model import DTransactionBase, DLogBase
 
 
 Base = orm.declarative_base()
@@ -36,7 +34,7 @@ Base = orm.declarative_base()
 
 class BigArchive(DTransactionBase, Base):
     """
-    Data model for ``bigArchive`` table.
+    Represents a record from ``bigArchive`` table.
     """
     __tablename__ = 'bigArchive'
 
@@ -45,19 +43,8 @@ class BigArchive(DTransactionBase, Base):
 TransactionDetail = BigArchive
 
 
-class DLogBase(common.TransactionDetailBase):
-    """
-    Base class for ``dlogBig`` and similar models.
-    """
-    store_row_id = sa.Column(sa.Integer(), primary_key=True, nullable=False)
-
-    store_id = sa.Column(sa.Integer(), nullable=True, default=0)
-    pos_row_id = sa.Column(sa.Integer(), nullable=True)
-    date_time = sa.Column('tdate', sa.DateTime(), nullable=True)
-
-
 class DLogBig(DLogBase, Base):
     """
-    Data model for ``dlogBig`` view.
+    Represents a record from ``dlogBig`` view.
     """
     __tablename__ = 'dlogBig'
diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index 67f405a..ff3f493 100644
--- a/corepos/db/office_op/model.py
+++ b/corepos/db/office_op/model.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
+#  Copyright © 2018-2024 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -31,8 +31,6 @@ import sqlalchemy as sa
 from sqlalchemy import orm
 from sqlalchemy.ext.associationproxy import association_proxy
 
-from corepos.db.common import op as common
-
 
 log = logging.getLogger(__name__)
 
@@ -993,12 +991,35 @@ class ProductPhysicalLocation(Base):
     location = sa.Column(sa.SmallInteger(), nullable=True, default=0)
 
 
-class Employee(common.EmployeeBase, Base):
+class Employee(Base):
     """
-    Data model for ``employees`` table.
+    Represents an employee within the organization.
     """
     __tablename__ = 'employees'
 
+    number = sa.Column('emp_no', sa.SmallInteger(), primary_key=True, autoincrement=False, nullable=False)
+
+    cashier_password = sa.Column('CashierPassword', sa.String(length=50), nullable=True)
+
+    admin_password = sa.Column('AdminPassword', sa.String(length=50), nullable=True)
+
+    first_name = sa.Column('FirstName', sa.String(length=255), nullable=True)
+
+    last_name = sa.Column('LastName', sa.String(length=255), nullable=True)
+
+    job_title = sa.Column('JobTitle', sa.String(length=255), nullable=True)
+
+    active = sa.Column('EmpActive', sa.Boolean(), nullable=True)
+
+    frontend_security = sa.Column('frontendsecurity', sa.SmallInteger(), nullable=True)
+
+    backend_security = sa.Column('backendsecurity', sa.SmallInteger(), nullable=True)
+
+    birth_date = sa.Column('birthdate', sa.DateTime(), nullable=True)
+
+    def __str__(self):
+        return ' '.join([self.first_name or '', self.last_name or '']).strip()
+
 
 class MemberType(Base):
     """
diff --git a/corepos/db/office_trans/model.py b/corepos/db/office_trans/model.py
index c2b0959..b4659cd 100644
--- a/corepos/db/office_trans/model.py
+++ b/corepos/db/office_trans/model.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2025 Lance Edgar
+#  Copyright © 2018-2024 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -26,8 +26,7 @@ CORE POS Transaction Data Model
 
 import sqlalchemy as sa
 from sqlalchemy import orm
-
-from corepos.db.common import trans as common
+from sqlalchemy.ext.declarative import declared_attr
 
 
 Base = orm.declarative_base()
@@ -69,20 +68,118 @@ class EquityLiveBalance(Base):
     start_date = sa.Column('startdate', sa.DateTime(), nullable=True)
 
 
-class DTransactionBase(common.TransactionDetailBase):
+class TransactionDetailBase:
     """
-    Base class for ``dtransactions`` and similar models.
+    Represents a POS transaction detail record.
     """
-    store_row_id = sa.Column(sa.Integer(), primary_key=True, nullable=False)
 
-    pos_row_id = sa.Column(sa.Integer(), nullable=True)
+    # store
+    store_row_id = sa.Column(sa.Integer(), primary_key=True, nullable=False)
     store_id = sa.Column(sa.Integer(), nullable=True, default=0)
+
+    # register
+    register_number = sa.Column('register_no', sa.Integer(), nullable=True)
+    pos_row_id = sa.Column(sa.Integer(), nullable=True)
+
+    # txn
+    transaction_id = sa.Column('trans_id', sa.Integer(), nullable=True)
+    transaction_number = sa.Column('trans_no', sa.Integer(), nullable=True)
+    transaction_type = sa.Column('trans_type', sa.String(length=1), nullable=True)
+    transaction_subtype = sa.Column('trans_subtype', sa.String(length=2), nullable=True)
+
+    trans_status = sa.Column(sa.String(length=1), nullable=True)
+
+    @declared_attr
+    def transaction_status(self):
+        return orm.synonym('trans_status')
+
+    # cashier
+    employee_number = sa.Column('emp_no', sa.Integer(), nullable=True)
+
+    # customer
+    card_number = sa.Column('card_no', sa.Integer(), nullable=True)
+    member_type = sa.Column('memType', sa.Integer(), nullable=True)
+    staff = sa.Column(sa.Boolean(), nullable=True)
+
+    ##############################
+    # remainder is "line item" ...
+    ##############################
+
+    upc = sa.Column(sa.String(length=13), nullable=True)
+
+    department_number = sa.Column('department', sa.Integer(), nullable=True)
+
+    description = sa.Column(sa.String(length=30), nullable=True)
+
+    quantity = sa.Column(sa.Float(), nullable=True)
+
+    scale = sa.Column(sa.Boolean(), nullable=True, default=False)
+
+    cost = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
+
+    unitPrice = sa.Column('unitPrice', sa.Numeric(precision=10, scale=2), nullable=True)
+
+    @declared_attr
+    def unit_price(self):
+        return orm.synonym('unitPrice')
+
+    total = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
+
+    reg_price = sa.Column('regPrice', sa.Numeric(precision=10, scale=2), nullable=True)
+
+    tax = sa.Column(sa.SmallInteger(), nullable=True)
+
+    @declared_attr
+    def tax_rate_id(self):
+        return orm.synonym('tax')
+
+    food_stamp = sa.Column('foodstamp', sa.Boolean(), nullable=True)
+
+    discount = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
+
+    member_discount = sa.Column('memDiscount', sa.Numeric(precision=10, scale=2), nullable=True)
+
+    discountable = sa.Column(sa.Boolean(), nullable=True)
+
+    discount_type = sa.Column('discounttype', sa.Integer(), nullable=True)
+
+    voided = sa.Column(sa.Integer(), nullable=True)
+
+    percent_discount = sa.Column('percentDiscount', sa.Integer(), nullable=True)
+
+    item_quantity = sa.Column('ItemQtty', sa.Float(), nullable=True)
+
+    volume_discount_type = sa.Column('volDiscType', sa.Integer(), nullable=True)
+
+    volume = sa.Column(sa.Integer(), nullable=True)
+
+    volume_special = sa.Column('VolSpecial', sa.Numeric(precision=10, scale=2), nullable=True)
+
+    mix_match = sa.Column('mixMatch', sa.String(length=13), nullable=True)
+
+    matched = sa.Column(sa.Boolean(), nullable=True)
+
+    num_flag = sa.Column('numflag', sa.Integer(), nullable=True, default=0)
+
+    char_flag = sa.Column('charflag', sa.String(length=2), nullable=True)
+
+    def __str__(self):
+        return self.description or ''
+
+
+class DTransactionBase(TransactionDetailBase):
+
     date_time = sa.Column('datetime', sa.DateTime(), nullable=True)
 
 
+class DLogBase(TransactionDetailBase):
+
+    date_time = sa.Column('tdate', sa.DateTime(), nullable=True)
+
+
 class DTransaction(DTransactionBase, Base):
     """
-    Data model for ``dtransactions`` table.
+    Represents a record from ``dtransactions`` table.
     """
     __tablename__ = 'dtransactions'