diff --git a/.gitignore b/.gitignore
index 07ddefb..9a52e5b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1 @@
-*~
-*.pyc
-dist/
 pyCOREPOS.egg-info/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2c26baa..20d31e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,129 +5,6 @@ All notable changes to pyCOREPOS will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## v0.5.1 (2025-02-20)
-
-### Fix
-
-- add `Product.default_vendor_item` convenience property
-
-## v0.5.0 (2025-02-01)
-
-### Feat
-
-- use true column names for transaction data models
-
-### Fix
-
-- define common base schema for Product model
-- add `Parameter` model for lane_op
-- add model for lane_trans `LocalTrans`
-
-## v0.4.0 (2025-01-24)
-
-### Feat
-
-- add common base class for `dtransactions` and similar models
-
-### Fix
-
-- add `Employee` model for lane_op
-- fix ordering of name columns for MemberInfo
-
-## v0.3.5 (2025-01-15)
-
-### Fix
-
-- add workaround to avoid missing schema columns
-
-## v0.3.4 (2025-01-15)
-
-### Fix
-
-- misc. cleanup for sales batch models
-- add more enums for batch discount type, editor UI
-
-## v0.3.3 (2025-01-13)
-
-### Fix
-
-- remove `autoincrement` option for composite PK fields
-
-## v0.3.2 (2025-01-11)
-
-### Fix
-
-- add base class for all transaction tables, views
-- add `MemberType.ignore_sales` column
-- add model for `MasterSuperDepartment`
-
-## v0.3.1 (2024-12-17)
-
-### Fix
-
-- add `wicable`, `active` columns for Department model
-
-## v0.3.0 (2024-08-06)
-
-### Feat
-
-- add model for `MemberContactPreference` (`op.memContactPrefs`)
-- add model for `CustomReceiptLine` (`op.customReceipt`)
-
-## v0.2.1 (2024-07-04)
-
-### Fix
-
-- add API methods, `get_employees()` and `get_employee()`
-- remove `Change` data model
-- remove dependency for `six` package
-
-## v0.2.0 (2024-06-10)
-
-### Feat
-
-- switch from setup.cfg to pyproject.toml + hatchling
-
-## [0.1.20] - 2024-05-29
-### Changed
-- Add enum for CORE (Office) DB types.
-
-## [0.1.19] - 2023-11-01
-### Changed
-- Fix data types for tax, voided in `dtransactions`.
-- Fix synonym for `dtransactions.tax`.
-
-## [0.1.18] - 2023-10-12
-### Changed
-- Fix the `Department.tax_rate` relationship.
-- Let `MemberInfo.dates` be an object, not a list.
-
-## [0.1.17] - 2023-10-07
-### Changed
-- Rename module to `corepos.db.office_arch`.
-
-## [0.1.16] - 2023-09-15
-### Changed
-- Add model for `office_op.Tender`.
-
-## [0.1.15] - 2023-09-13
-### Changed
-- Add model for `CustomerNotifications` table.
-
-## [0.1.14] - 2023-09-07
-### Changed
-- Tweak primary key for StockPurchase model.
-
-## [0.1.13] - 2023-09-02
-### Changed
-- Add models for StockPurchase and EquityLiveBalance.
-
-## [0.1.12] - 2023-06-12
-### Changed
-- Add `get_member_types()` method for CORE API.
-- Rename model for `custdata` to `CustomerClassic`.
-- Add note about `meminfo.email_2` field, aka. "alt. phone".
-
 ## [0.1.11] - 2023-06-02
 ### Changed
 - Add support for htdigest auth when using CORE webservices API.
diff --git a/README.md b/README.md
deleted file mode 100644
index dd69797..0000000
--- a/README.md
+++ /dev/null
@@ -1,5 +0,0 @@
-
-# pyCOREPOS
-
-A Python interface to the [CORE POS](https://github.com/CORE-POS)
-system.
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..0b34d2f
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,7 @@
+
+pyCOREPOS
+=========
+
+A Python interface to the `CORE POS`_ system.
+
+.. _CORE POS:  https://github.com/CORE-POS
diff --git a/corepos/_version.py b/corepos/_version.py
index 555fee3..862eaaa 100644
--- a/corepos/_version.py
+++ b/corepos/_version.py
@@ -1,6 +1,3 @@
 # -*- coding: utf-8; -*-
 
-from importlib.metadata import version
-
-
-__version__ = version('pyCOREPOS')
+__version__ = '0.1.11'
diff --git a/corepos/api.py b/corepos/api.py
index a24b906..c93ff9d 100644
--- a/corepos/api.py
+++ b/corepos/api.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2024 Lance Edgar
+#  Copyright © 2018-2023 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -132,22 +132,6 @@ class CoreWebAPI(object):
         assert set(js['result'].keys()) == set(['result'])
         return js['result']['result']
 
-    def get_member_types(self):
-        """
-        Fetch all Member Type records from CORE.
-
-        :returns: A (potentially empty) list of member type dict records.
-        """
-        params = {
-            'entity': 'Memtype',
-            'submethod': 'get',
-            'columns': {},
-        }
-
-        response = self.post(params)
-        result = self.parse_response(response)
-        return [json.loads(rec) for rec in result]
-
     def get_members(self):
         """
         Fetch all Member records from CORE.
@@ -198,40 +182,6 @@ class CoreWebAPI(object):
         if result:
             return result
 
-    def get_employees(self, **columns):
-        """
-        Fetch some or all of Employee records from CORE.
-
-        :returns: A (potentially empty) list of employee dict records.
-        """
-        params = {
-            'entity': 'Employees',
-            'submethod': 'get',
-            'columns': columns,
-        }
-        response = self.post(params)
-        result = self.parse_response(response)
-        return [json.loads(rec) for rec in result]
-
-    def get_employee(self, emp_no, **columns):
-        """
-        Fetch an existing Employee record from CORE.
-
-        :returns: Either a employee dict record, or ``None``.
-        """
-        columns['emp_no'] = emp_no
-        params = {
-            'entity': 'Employees',
-            'submethod': 'get',
-            'columns': columns,
-        }
-        response = self.post(params)
-        result = self.parse_response(response)
-        if result:
-            if len(result) > 1:
-                log.warning("CORE API returned %s employee results", len(result))
-            return json.loads(result[0])
-
     def get_stores(self, **columns):
         """
         Fetch some or all of Store records from CORE.
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 30ecc1c..0000000
--- a/corepos/db/common/op.py
+++ /dev/null
@@ -1,173 +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 ParameterBase:
-    """
-    Base class for Parameter models, shared by Office + Lane.
-    """
-    store_id = sa.Column(sa.SmallInteger(), primary_key=True, nullable=False)
-
-    lane_id = sa.Column(sa.SmallInteger(), primary_key=True, nullable=False)
-
-    param_key = sa.Column(sa.String(length=100), primary_key=True, nullable=False)
-
-    param_value = sa.Column(sa.String(length=255), nullable=True)
-
-    is_array = sa.Column(sa.Boolean(), nullable=True)
-
-    def __str__(self):
-        return f"{self.store_id}-{self.lane_id} {self.param_key}"
-
-
-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()
-
-
-class ProductBase:
-    """
-    Base class for Product models, shared by Office + Lane.
-    """
-    id = sa.Column(sa.Integer(), nullable=False, primary_key=True, autoincrement=True)
-
-    upc = sa.Column(sa.String(length=13), nullable=True)
-
-    description = sa.Column(sa.String(length=30), nullable=True)
-
-    brand = sa.Column(sa.String(length=30), nullable=True)
-
-    formatted_name = sa.Column(sa.String(length=30), nullable=True)
-
-    normal_price = sa.Column(sa.Float(), nullable=True)
-
-    price_method = sa.Column('pricemethod', sa.SmallInteger(), nullable=True)
-
-    group_price = sa.Column('groupprice', sa.Float(), nullable=True)
-
-    quantity = sa.Column(sa.SmallInteger(), nullable=True)
-
-    special_price = sa.Column(sa.Float(), nullable=True)
-
-    special_price_method = sa.Column('specialpricemethod', sa.SmallInteger(), nullable=True)
-
-    special_group_price = sa.Column('specialgroupprice', sa.Float(), nullable=True)
-
-    special_quantity = sa.Column('specialquantity', sa.SmallInteger(), nullable=True)
-
-    special_limit = sa.Column(sa.SmallInteger(), nullable=True)
-
-    start_date = sa.Column(sa.DateTime(), nullable=True)
-
-    end_date = sa.Column(sa.DateTime(), nullable=True)
-
-    department_number = sa.Column('department', sa.SmallInteger(), nullable=True)
-
-    size = sa.Column(sa.String(length=9), nullable=True)
-
-    tax_rate_id = sa.Column('tax', sa.SmallInteger(), nullable=True)
-
-    foodstamp = sa.Column(sa.Boolean(), nullable=True)
-
-    scale = sa.Column(sa.Boolean(), nullable=True)
-
-    scale_price = sa.Column('scaleprice', sa.Float(), nullable=True)
-
-    mix_match_code = sa.Column('mixmatchcode', sa.String(length=13), nullable=True)
-
-    created = sa.Column(sa.DateTime(), nullable=True)
-
-    modified = sa.Column(sa.DateTime(), nullable=True)
-
-    tare_weight = sa.Column('tareweight', sa.Float(), nullable=True)
-
-    discount = sa.Column(sa.SmallInteger(), nullable=True)
-
-    discount_type = sa.Column('discounttype', sa.SmallInteger(), nullable=True)
-
-    line_item_discountable = sa.Column(sa.Boolean(), nullable=True)
-
-    unit_of_measure = sa.Column('unitofmeasure', sa.String(length=15), nullable=True)
-
-    wicable = sa.Column(sa.SmallInteger(), nullable=True)
-
-    quantity_enforced = sa.Column('qttyEnforced', sa.Boolean(), nullable=True)
-
-    id_enforced = sa.Column('idEnforced', sa.SmallInteger(), nullable=True)
-
-    cost = sa.Column(sa.Float(), nullable=True)
-
-    special_cost = sa.Column(sa.Float(), nullable=True)
-
-    received_cost = sa.Column(sa.Float(), nullable=True)
-
-    in_use = sa.Column('inUse', sa.Boolean(), nullable=True)
-
-    numflag = sa.Column(sa.Integer(), nullable=True)
-
-    subdepartment_number = sa.Column('subdept', sa.SmallInteger(), nullable=True)
-
-    deposit = sa.Column(sa.Float(), nullable=True)
-
-    local = sa.Column(sa.Integer(), nullable=True, default=0)
-
-    store_id = sa.Column(sa.SmallInteger(), nullable=True)
-
-    default_vendor_id = sa.Column(sa.Integer(), nullable=True)
-
-    current_origin_id = sa.Column(sa.Integer(), nullable=True)
-
-    auto_par = sa.Column(sa.Float(), nullable=True, default=0)
-
-    price_rule_id = sa.Column(sa.Integer(), nullable=True, default=0)
-
-    last_sold = sa.Column(sa.DateTime(), nullable=True)
diff --git a/corepos/db/common/trans.py b/corepos/db/common/trans.py
deleted file mode 100644
index 9ec5601..0000000
--- a/corepos/db/common/trans.py
+++ /dev/null
@@ -1,114 +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_no = sa.Column(sa.Integer(), nullable=True)
-
-    # txn
-    trans_id = sa.Column(sa.Integer(), nullable=True)
-    trans_no = sa.Column(sa.Integer(), nullable=True)
-    trans_type = sa.Column(sa.String(length=1), nullable=True)
-    trans_subtype = sa.Column(sa.String(length=2), nullable=True)
-    trans_status = sa.Column(sa.String(length=1), nullable=True)
-
-    # cashier
-    emp_no = sa.Column(sa.Integer(), nullable=True)
-
-    # customer
-    card_no = sa.Column(sa.Integer(), nullable=True)
-    memType = sa.Column(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 = sa.Column(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(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    total = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    regPrice = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    tax = sa.Column(sa.SmallInteger(), nullable=True)
-
-    foodstamp = sa.Column(sa.Boolean(), nullable=True)
-
-    discount = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    memDiscount = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    discountable = sa.Column(sa.Boolean(), nullable=True)
-
-    discounttype = sa.Column(sa.Integer(), nullable=True)
-
-    voided = sa.Column(sa.Integer(), nullable=True)
-
-    percentDiscount = sa.Column(sa.Integer(), nullable=True)
-
-    ItemQtty = sa.Column(sa.Float(), nullable=True)
-
-    volDiscType = sa.Column(sa.Integer(), nullable=True)
-
-    volume = sa.Column(sa.Integer(), nullable=True)
-
-    VolSpecial = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    mixMatch = sa.Column(sa.String(length=13), nullable=True)
-
-    matched = sa.Column(sa.Boolean(), nullable=True)
-
-    numflag = sa.Column(sa.Integer(), nullable=True, default=0)
-
-    charflag = sa.Column(sa.String(length=2), nullable=True)
-
-    def __str__(self):
-        txnid = '-'.join([str(val) for val in [self.register_no,
-                                               self.trans_no,
-                                               self.trans_id]])
-        return f"{txnid} {self.description or ''}"
diff --git a/corepos/db/lane_op/model.py b/corepos/db/lane_op/model.py
index 456b1b8..1c687ab 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.
 #
@@ -27,26 +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 Parameter(common.ParameterBase, Base):
-    """
-    Data model for ``parameters`` table.
-    """
-    __tablename__ = 'parameters'
-
-
-class Employee(common.EmployeeBase, Base):
-    """
-    Data model for ``employees`` table.
-    """
-    __tablename__ = 'employees'
-
-
 class Department(Base):
     """
     Represents a department within the organization.
@@ -88,14 +72,144 @@ class Department(Base):
         return self.name or ""
 
 
-class Product(common.ProductBase, Base):
+class Product(Base):
     """
-    Data model for ``products`` table.
+    Represents a product, purchased and/or sold by the organization.
     """
     __tablename__ = 'products'
+    # __table_args__ = (
+    #     sa.ForeignKeyConstraint(['department'], ['departments.dept_no']),
+    #     sa.ForeignKeyConstraint(['subdept'], ['subdepts.subdept_no']),
+    #     sa.ForeignKeyConstraint(['tax'], ['taxrates.id']),
+    # )
+
+    id = sa.Column(sa.Integer(), nullable=False, 
+                   primary_key=True, autoincrement=True)
+
+    upc = sa.Column(sa.String(length=13), nullable=True)
+
+    description = sa.Column(sa.String(length=30), nullable=True)
+
+    brand = sa.Column(sa.String(length=30), nullable=True)
+
+    formatted_name = sa.Column(sa.String(length=30), nullable=True)
+
+    normal_price = sa.Column(sa.Float(), nullable=True)
+
+    price_method = sa.Column('pricemethod', sa.SmallInteger(), nullable=True)
+
+    group_price = sa.Column('groupprice', sa.Float(), nullable=True)
+
+    quantity = sa.Column(sa.SmallInteger(), nullable=True)
+
+    special_price = sa.Column(sa.Float(), nullable=True)
+
+    special_price_method = sa.Column('specialpricemethod', sa.SmallInteger(), nullable=True)
+
+    special_group_price = sa.Column('specialgroupprice', sa.Float(), nullable=True)
+
+    special_quantity = sa.Column('specialquantity', sa.SmallInteger(), nullable=True)
+
+    special_limit = sa.Column(sa.SmallInteger(), nullable=True)
+
+    start_date = sa.Column(sa.DateTime(), nullable=True)
+
+    end_date = sa.Column(sa.DateTime(), nullable=True)
+
+    department_number = sa.Column('department', sa.SmallInteger(), nullable=True)
+    # department = orm.relationship(
+    #     Department,
+    #     primaryjoin=Department.number == department_number,
+    #     foreign_keys=[department_number],
+    #     doc="""
+    #     Reference to the :class:`Department` to which the product belongs.
+    #     """)
+
+    size = sa.Column(sa.String(length=9), nullable=True)
+
+    tax_rate_id = sa.Column('tax', sa.SmallInteger(), nullable=True)
+    # tax_rate = orm.relationship(TaxRate)
+
+    foodstamp = sa.Column(sa.Boolean(), nullable=True)
+
+    scale = sa.Column(sa.Boolean(), nullable=True)
+
+    scale_price = sa.Column('scaleprice', sa.Float(), nullable=True)
+
+    mix_match_code = sa.Column('mixmatchcode', sa.String(length=13), nullable=True)
+
+    created = sa.Column(sa.DateTime(), nullable=True)
+
+    modified = sa.Column(sa.DateTime(), nullable=True)
+
+    # TODO: what to do about this 'replaces' thing?
+    # 'batchID'=>array('type'=>'TINYINT', 'replaces'=>'advertised'),
+    # batch_id = sa.Column('batchID', sa.SmallInteger(), nullable=True)
+    # advertised = sa.Column(sa.Boolean(), nullable=True)
+
+    tare_weight = sa.Column('tareweight', sa.Float(), nullable=True)
+
+    discount = sa.Column(sa.SmallInteger(), nullable=True)
+
+    discount_type = sa.Column('discounttype', sa.SmallInteger(), nullable=True)
+
+    line_item_discountable = sa.Column(sa.Boolean(), nullable=True)
+
+    unit_of_measure = sa.Column('unitofmeasure', sa.String(length=15), nullable=True)
+
+    wicable = sa.Column(sa.SmallInteger(), nullable=True)
+
+    quantity_enforced = sa.Column('qttyEnforced', sa.Boolean(), nullable=True)
+
+    id_enforced = sa.Column('idEnforced', sa.SmallInteger(), nullable=True)
+
+    cost = sa.Column(sa.Float(), nullable=True)
+
+    special_cost = sa.Column(sa.Float(), nullable=True)
+
+    received_cost = sa.Column(sa.Float(), nullable=True)
+
+    in_use = sa.Column('inUse', sa.Boolean(), nullable=True)
+
+    flags = sa.Column('numflag', sa.Integer(), nullable=True)
+
+    subdepartment_number = sa.Column('subdept', sa.SmallInteger(), nullable=True)
+    # subdepartment = orm.relationship(
+    #     Subdepartment,
+    #     primaryjoin=Subdepartment.number == subdepartment_number,
+    #     foreign_keys=[subdepartment_number],
+    #     doc="""
+    #     Reference to the :class:`Subdepartment` to which the product belongs.
+    #     """)
+
+    deposit = sa.Column(sa.Float(), nullable=True)
+
+    local = sa.Column(sa.Integer(), nullable=True,
+                      default=0) # TODO: do we want a default here?
+
+    store_id = sa.Column(sa.SmallInteger(), nullable=True)
+
+    default_vendor_id = sa.Column(sa.Integer(), nullable=True)
+    # default_vendor = orm.relationship(
+    #     Vendor,
+    #     primaryjoin=Vendor.id == default_vendor_id,
+    #     foreign_keys=[default_vendor_id],
+    #     doc="""
+    #     Reference to the default :class:`Vendor` from which the product is obtained.
+    #     """)
+
+    current_origin_id = sa.Column(sa.Integer(), nullable=True)
+
+    auto_par = sa.Column(sa.Float(), nullable=True,
+                         default=0) # TODO: do we want a default here?
+
+    price_rule_id = sa.Column(sa.Integer(), nullable=True)
+
+    # TODO: some older DB's might not have this?  guess we'll see
+    last_sold = sa.Column(sa.DateTime(), nullable=True)
 
 
-class CustomerClassic(Base):
+class CustData(Base):
     """
     Represents a customer of the organization.
 
@@ -161,7 +275,3 @@ class CustomerClassic(Base):
 
     def __str__(self):
         return "{} {}".format(self.first_name or '', self.last_name or '').strip()
-
-
-# TODO: deprecate / remove this
-CustData = CustomerClassic
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 f2245f5..0000000
--- a/corepos/db/lane_trans/model.py
+++ /dev/null
@@ -1,79 +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 sqlalchemy.ext.declarative import declared_attr
-
-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):
-    """
-    Data model for ``dtransactions`` table.
-    """
-    __tablename__ = 'dtransactions'
-
-
-class LocalTransBase(common.TransactionDetailBase):
-    """
-    Base class for ``localtrans`` and similar models.
-    """
-
-    @declared_attr
-    def __table_args__(self):
-        return (
-            sa.PrimaryKeyConstraint('trans_id'),
-        )
-
-    date_time = sa.Column('datetime', sa.DateTime(), nullable=True)
-
-
-class LocalTrans(LocalTransBase, Base):
-    """
-    Data model for ``localtrans`` table.
-    """
-    __tablename__ = 'localtrans'
-
-
-class LocalTempTrans(LocalTransBase, Base):
-    """
-    Data model for ``localtemptrans`` table.
-    """
-    __tablename__ = 'localtemptrans'
diff --git a/corepos/db/office_arch/model.py b/corepos/db/office_arch/model.py
deleted file mode 100644
index bc5838f..0000000
--- a/corepos/db/office_arch/model.py
+++ /dev/null
@@ -1,63 +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/>.
-#
-################################################################################
-"""
-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
-
-
-Base = orm.declarative_base()
-
-
-class BigArchive(DTransactionBase, Base):
-    """
-    Data model for ``bigArchive`` table.
-    """
-    __tablename__ = 'bigArchive'
-
-
-# TODO: deprecate / remove this
-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.
-    """
-    __tablename__ = 'dlogBig'
diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index 60ad478..132fd33 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 © 2018-2023 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__)
 
@@ -56,12 +54,42 @@ class StringableDateTime(sa.TypeDecorator):
         raise NotImplementedError
 
 
-class Parameter(common.ParameterBase, Base):
+class Change(Base):
     """
-    Data model for ``parameters`` table.
+    Represents a changed (or deleted) record, which is pending synchronization
+    to another system(s).
+
+    .. note::
+       This table may or may not be installed to a given CORE Office Op DB.  Its
+       presence is required if Rattail datasync needs to "watch" the DB.
+    """
+    __tablename__ = 'datasync_changes'
+
+    id = sa.Column(sa.Integer(), nullable=False, primary_key=True)
+    object_type = sa.Column(sa.String(length=255), nullable=False)
+    object_key = sa.Column(sa.String(length=255), nullable=False)
+    deleted = sa.Column(sa.Boolean(), nullable=False, default=False)
+
+
+class Parameter(Base):
+    """
+    Represents a "parameter" value.
     """
     __tablename__ = 'parameters'
 
+    store_id = sa.Column(sa.SmallInteger(), primary_key=True, nullable=False)
+
+    lane_id = sa.Column(sa.SmallInteger(), primary_key=True, nullable=False)
+
+    param_key = sa.Column(sa.String(length=100), primary_key=True, nullable=False)
+
+    param_value = sa.Column(sa.String(length=255), nullable=True)
+
+    is_array = sa.Column(sa.Boolean(), nullable=True)
+
+    def __str__(self):
+        return "{}-{} {}".format(self.store_id, self.lane_id, self.param_key)
+
 
 class TableSyncRule(Base):
     """
@@ -69,9 +97,7 @@ class TableSyncRule(Base):
     """
     __tablename__ = 'TableSyncRules'
 
-    # nb. this should be autoincrement, but we can't do that
-    # automatically via sqlalchemy when PK is composite
-    id = sa.Column('tableSyncRuleID', sa.Integer(), nullable=False, primary_key=True)
+    id = sa.Column('tableSyncRuleID', sa.Integer(), nullable=False, primary_key=True, autoincrement=True)
 
     table_name = sa.Column('tableName', sa.String(length=255), nullable=False, primary_key=True)
 
@@ -160,25 +186,6 @@ class Store(Base):
         return self.description or ""
 
 
-class MasterSuperDepartment(Base):
-    """
-    A department may belong to more than one superdepartment, but has
-    one "master" superdepartment.  This avoids duplicating rows in
-    some reports.  By convention, a department's "master"
-    superdepartment is the one with the lowest superID.
-    """
-    __tablename__ = 'MasterSuperDepts'
-
-    super_id = sa.Column('superID', sa.Integer(), primary_key=True, autoincrement=False, nullable=False)
-
-    department_id = sa.Column('dept_ID', sa.Integer(), primary_key=True, autoincrement=False, nullable=False)
-
-    super_name = sa.Column(sa.String(length=50), nullable=True)
-
-    def __str__(self):
-        return self.super_name or ""
-
-
 class SuperDepartment(Base):
     """
     Represents a "super" (parent/child) department mapping.
@@ -218,25 +225,15 @@ class Department(Base):
     Represents a department within the organization.
     """
     __tablename__ = 'departments'
-    __table_args__ = (
-        sa.ForeignKeyConstraint(['dept_tax'], ['taxrates.id']),
-    )
 
     number = sa.Column('dept_no', sa.SmallInteger(), primary_key=True, autoincrement=False, nullable=False)
 
     name = sa.Column('dept_name', sa.String(length=30), nullable=True)
 
-    tax_rate_id = sa.Column('dept_tax', sa.SmallInteger(), nullable=True)
-    tax_rate = orm.relationship('TaxRate')
-    # TODO: deprecate / remove this
-    tax = orm.synonym('tax_rate_id')
+    tax = sa.Column('dept_tax', sa.Boolean(), nullable=True)
 
     food_stampable = sa.Column('dept_fs', sa.Boolean(), nullable=True)
 
-    wicable = sa.Column('dept_wicable', sa.SmallInteger(), nullable=True)
-
-    active = sa.Column(sa.Boolean(), default=True)
-
     limit = sa.Column('dept_limit', sa.Float(), nullable=True)
 
     minimum = sa.Column('dept_minimum', sa.Float(), nullable=True)
@@ -536,7 +533,7 @@ class Origin(Base):
         return self.name or self.short_name or ""
 
 
-class Product(common.ProductBase, Base):
+class Product(Base):
     """
     Represents a product, purchased and/or sold by the organization.
     """
@@ -547,68 +544,125 @@ class Product(common.ProductBase, Base):
         sa.ForeignKeyConstraint(['tax'], ['taxrates.id']),
     )
 
+    id = sa.Column(sa.Integer(), primary_key=True, autoincrement=True, nullable=False)
+
+    upc = sa.Column(sa.String(length=13), nullable=True)
+
+    description = sa.Column(sa.String(length=30), nullable=True)
+
+    brand = sa.Column(sa.String(length=30), nullable=True)
+
+    formatted_name = sa.Column(sa.String(length=30), nullable=True)
+
+    normal_price = sa.Column(sa.Float(), nullable=True)
+
+    price_method = sa.Column('pricemethod', sa.SmallInteger(), nullable=True)
+
+    group_price = sa.Column('groupprice', sa.Float(), nullable=True)
+
+    quantity = sa.Column(sa.SmallInteger(), nullable=True)
+
+    special_price = sa.Column(sa.Float(), nullable=True)
+
+    special_price_method = sa.Column('specialpricemethod', sa.SmallInteger(), nullable=True)
+
+    special_group_price = sa.Column('specialgroupprice', sa.Float(), nullable=True)
+
+    special_quantity = sa.Column('specialquantity', sa.SmallInteger(), nullable=True)
+
+    start_date = sa.Column(sa.DateTime(), nullable=True)
+
+    end_date = sa.Column(sa.DateTime(), nullable=True)
+
+    department_number = sa.Column('department', sa.SmallInteger(), nullable=True)
     department = orm.relationship(
         Department,
-        primaryjoin='Department.number == Product.department_number',
-        foreign_keys='Product.department_number',
+        primaryjoin=Department.number == department_number,
+        foreign_keys=[department_number],
         doc="""
         Reference to the :class:`Department` to which the product belongs.
         """)
 
+    size = sa.Column(sa.String(length=9), nullable=True)
+
+    tax_rate_id = sa.Column('tax', sa.SmallInteger(), nullable=True)
     tax_rate = orm.relationship(TaxRate)
 
+    foodstamp = sa.Column(sa.Boolean(), nullable=True)
+
+    scale = sa.Column(sa.Boolean(), nullable=True)
+
+    # TODO: yikes, did i just code this all wrong the first time?  pretty sure
+    # this needs to change to a decimal column...
+    scale_price = sa.Column('scaleprice', sa.Boolean(), nullable=True)
+    # scale_price = sa.Column('scaleprice', sa.Numeric(precision=10, scale=2), nullable=True)
+
+    mix_match_code = sa.Column('mixmatchcode', sa.String(length=13), nullable=True)
+
+    created = sa.Column(StringableDateTime(), nullable=True)
+
+    modified = sa.Column(sa.DateTime(), nullable=True)
+
     # advertised = sa.Column(sa.Boolean(), nullable=True)
 
+    tare_weight = sa.Column('tareweight', sa.Float(), nullable=True)
+
+    discount = sa.Column(sa.SmallInteger(), nullable=True)
+
+    discount_type = sa.Column('discounttype', sa.SmallInteger(), nullable=True)
+
+    line_item_discountable = sa.Column(sa.Boolean(), nullable=True)
+
+    unit_of_measure = sa.Column('unitofmeasure', sa.String(length=15), nullable=True)
+
+    wicable = sa.Column(sa.SmallInteger(), nullable=True)
+
+    quantity_enforced = sa.Column('qttyEnforced', sa.Boolean(), nullable=True)
+
+    id_enforced = sa.Column('idEnforced', sa.SmallInteger(), nullable=True)
+
+    cost = sa.Column(sa.Float(), nullable=True)
+
+    in_use = sa.Column('inUse', sa.Boolean(), nullable=True)
+
+    flags = sa.Column('numflag', sa.Integer(), nullable=True)
+
+    subdepartment_number = sa.Column('subdept', sa.SmallInteger(), nullable=True)
     subdepartment = orm.relationship(
         Subdepartment,
-        primaryjoin='Subdepartment.number == Product.subdepartment_number',
-        foreign_keys='Product.subdepartment_number',
+        primaryjoin=Subdepartment.number == subdepartment_number,
+        foreign_keys=[subdepartment_number],
         doc="""
         Reference to the :class:`Subdepartment` to which the product belongs.
         """)
 
+    deposit = sa.Column(sa.Float(), nullable=True)
+
+    local = sa.Column(sa.Integer(), nullable=True)
+
+    store_id = sa.Column(sa.SmallInteger(), nullable=True)
+
+    default_vendor_id = sa.Column(sa.Integer(), nullable=True)
     default_vendor = orm.relationship(
         Vendor,
-        primaryjoin='Vendor.id == Product.default_vendor_id',
-        foreign_keys='Product.default_vendor_id',
+        primaryjoin=Vendor.id == default_vendor_id,
+        foreign_keys=[default_vendor_id],
         doc="""
         Reference to the default :class:`Vendor` from which the product is obtained.
         """)
-
     # TODO: deprecate / remove this?
     vendor = orm.synonym('default_vendor')
 
+    current_origin_id = sa.Column(sa.Integer(), nullable=True)
+
+    # TODO: some older DB's might not have this?  guess we'll see
+    last_sold = sa.Column(sa.DateTime(), nullable=True)
+
     like_code = association_proxy(
         '_like_code', 'like_code',
         creator=lambda lc: ProductLikeCode(like_code=lc),
     )
 
-    vendor_items = orm.relationship(
-        'VendorItem',
-        back_populates='product',
-        primaryjoin='VendorItem.upc == Product.upc',
-        foreign_keys='VendorItem.upc',
-        order_by='VendorItem.vendor_item_id',
-        doc="""
-        List of :class:`VendorItem` records for this product.
-        """)
-
-    @property
-    def default_vendor_item(self):
-        """
-        Returns the "default" vendor item record.  This will
-        correspond to the :attr:`default_vendor` if possible.
-
-        :rtype: :class:`VendorItem` or ``None``
-        """
-        if self.default_vendor:
-            for item in self.vendor_items:
-                if item.vendor_id == self.default_vendor.id:
-                    return item
-
-        if self.vendor_items:
-            return self.vendor_items[0]
-
     @property
     def full_description(self):
         fields = ['brand', 'description', 'size']
@@ -758,12 +812,17 @@ class VendorItem(Base):
     upc = sa.Column(sa.String(length=13), nullable=False)
     product = orm.relationship(
         Product,
-        back_populates='vendor_items',
         primaryjoin=Product.upc == upc,
         foreign_keys=[upc],
         doc="""
         Reference to the :class:`Product` to which this record applies.
-        """)
+        """,
+        backref=orm.backref(
+            'vendor_items',
+            order_by=vendor_item_id,
+            doc="""
+            List of :class:`VendorItem` records for this product.
+            """))
 
     brand = sa.Column(sa.String(length=50), nullable=True)
 
@@ -918,12 +977,35 @@ 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):
     """
@@ -943,11 +1025,9 @@ class MemberType(Base):
 
     ssi = sa.Column(sa.Boolean(), nullable=True)
 
-    # nb. this must be added explicitly if DB is new enough
-    #ignore_sales = sa.Column('ignoreSales', sa.Boolean(), nullable=True, default=False)
-
-    # nb. this must be added explicitly if DB is new enough
-    #sales_code = sa.Column('salesCode', sa.Integer(), nullable=True)
+    # TODO: this was apparently added "recently" - isn't present in all DBs
+    # (need to figure out how to conditionally include it in model?)
+    # sales_code = sa.Column('salesCode', sa.Integer(), nullable=True)
 
     def __str__(self):
         return self.description or ""
@@ -1073,7 +1153,7 @@ class Customer(Base):
         return "{} {}".format(self.first_name or '', self.last_name or '').strip()
 
 
-class CustomerClassic(Base):
+class CustData(Base):
     """
     Represents a customer of the organization.
 
@@ -1139,7 +1219,7 @@ class CustomerClassic(Base):
 
     member_info = orm.relationship(
         'MemberInfo',
-        primaryjoin='MemberInfo.card_number == CustomerClassic.card_number',
+        primaryjoin='MemberInfo.card_number == CustData.card_number',
         foreign_keys=[card_number],
         uselist=False,
         back_populates='customers',
@@ -1151,10 +1231,6 @@ class CustomerClassic(Base):
         return "{} {}".format(self.first_name or '', self.last_name or '').strip()
 
 
-# TODO: deprecate / remove this
-CustData = CustomerClassic
-
-
 class MemberInfo(Base):
     """
     Contact info regarding a member of the organization.
@@ -1163,14 +1239,14 @@ class MemberInfo(Base):
 
     card_number = sa.Column('card_no', sa.Integer(), primary_key=True, autoincrement=False, nullable=False)
 
-    first_name = sa.Column(sa.String(length=30), nullable=True)
-
     last_name = sa.Column(sa.String(length=30), nullable=True)
 
-    other_first_name = sa.Column('othfirst_name', sa.String(length=30), nullable=True)
+    first_name = sa.Column(sa.String(length=30), nullable=True)
 
     other_last_name = sa.Column('othlast_name', sa.String(length=30), nullable=True)
 
+    other_first_name = sa.Column('othfirst_name', sa.String(length=30), nullable=True)
+
     street = sa.Column(sa.String(length=255), nullable=True)
 
     city = sa.Column(sa.String(length=20), nullable=True)
@@ -1183,22 +1259,19 @@ class MemberInfo(Base):
 
     email = sa.Column('email_1', sa.String(length=50), nullable=True)
 
-    email2 = sa.Column('email_2', sa.String(length=50), nullable=True, doc="""
-    NB. this is labeled "Alt. Phone" in CORE Office member view, and
-    is named `altPhone` when dealing with CORE Office webservices API.
-    """)
+    email2 = sa.Column('email_2', sa.String(length=50), nullable=True)
 
     ads_ok = sa.Column('ads_OK', sa.Boolean(), nullable=True, default=True)
 
     customers = orm.relationship(
-        CustomerClassic,
-        primaryjoin=CustomerClassic.card_number == card_number,
-        order_by=CustomerClassic.person_number,
-        foreign_keys=[CustomerClassic.card_number],
+        CustData,
+        primaryjoin=CustData.card_number == card_number,
+        order_by=CustData.person_number,
+        foreign_keys=[CustData.card_number],
         back_populates='member_info',
-        remote_side=CustomerClassic.card_number,
+        remote_side=CustData.card_number,
         doc="""
-        List of :class:`CustomerClassic` instances which are associated with this member info.
+        List of :class:`CustData` instances which are associated with this member info.
         """)
 
     dates = orm.relationship(
@@ -1206,7 +1279,6 @@ class MemberInfo(Base):
         primaryjoin='MemberDate.card_number == MemberInfo.card_number',
         foreign_keys='MemberDate.card_number',
         cascade='all, delete-orphan',
-        uselist=False,
         doc="""
         List of date records for the member.
         """,
@@ -1309,7 +1381,7 @@ class MemberDate(Base):
 
 class MemberContact(Base):
     """
-    Member contacts
+    Contact preferences for members
     """
     __tablename__ = 'memContact'
 
@@ -1336,19 +1408,6 @@ class MemberContact(Base):
         return str(self.preference)
 
 
-class MemberContactPreference(Base):
-    """
-    Member contact preferences
-    """
-    __tablename__ = 'memContactPrefs'
-
-    id = sa.Column('pref_id', sa.Integer(), primary_key=True, autoincrement=False, nullable=False)
-    description = sa.Column('pref_description', sa.String(length=50), nullable=True)
-
-    def __str__(self):
-        return self.description or ""
-
-
 class MemberBarcode(Base):
     """
     Additional barcode for a member.
@@ -1384,26 +1443,6 @@ class MemberNote(Base):
         return self.note or ""
 
 
-class CustomerNotification(Base):
-    """
-    Represents a customer notification for display at the lane.
-
-    https://github.com/CORE-POS/IS4C/blob/master/fannie/classlib2.0/data/models/op/CustomerNotificationsModel.php
-    """
-    __tablename__ = 'CustomerNotifications'
-
-    id = sa.Column('customerNotificationID', sa.Integer(), primary_key=True, autoincrement=True, nullable=False)
-    card_number = sa.Column('cardNo', sa.Integer(), nullable=True)
-    customer_id = sa.Column('customerID', sa.Integer(), nullable=True)
-    source = sa.Column(sa.String(length=50), nullable=True)
-    type = sa.Column(sa.String(length=50), nullable=True)
-    message = sa.Column(sa.String(length=255), nullable=True)
-    modifier_module = sa.Column('modifierModule', sa.String(length=50), nullable=True)
-
-    def __str__(self):
-        return self.message or ''
-
-
 class ReasonCode(Base):
     """
     Reason codes for legacy account suspensions.
@@ -1494,54 +1533,13 @@ class HouseCoupon(Base):
         return self.description or ''
 
 
-class Tender(Base):
-    """
-    Represents a tender for payment at POS
-    """
-    __tablename__ = 'tenders'
-
-    tender_id = sa.Column('TenderID', sa.Integer(), primary_key=True, nullable=False)
-
-    tender_code = sa.Column('TenderCode', sa.String(length=2), nullable=True)
-    tender_name = sa.Column('TenderName', sa.String(length=25), nullable=True)
-    tender_type = sa.Column('TenderType', sa.String(length=2), nullable=True)
-    change_message = sa.Column('ChangeMessage', sa.String(length=25), nullable=True)
-    min_amount = sa.Column('MinAmount', sa.Numeric(precision=10, scale=2), nullable=True)
-    max_amount = sa.Column('MaxAmount', sa.Numeric(precision=10, scale=2), nullable=True)
-    max_refund = sa.Column('MaxRefund', sa.Numeric(precision=10, scale=2), nullable=True)
-    tender_module = sa.Column('TenderModule', sa.String(length=50), nullable=True)
-    sales_code = sa.Column('SalesCode', sa.Integer(), nullable=True)
-
-    def __str__(self):
-        return self.tender_name or ''
-
-
-class CustomReceiptLine(Base):
-    """
-    Represents a "text string" line for a custom receipt.
-    """
-    __tablename__ = 'customReceipt'
-
-    # nb. this should be autoincrement, but we can't do that
-    # automatically via sqlalchemy when PK is composite
-    sequence = sa.Column('seq', sa.Integer(), primary_key=True, nullable=False)
-
-    type = sa.Column(sa.String(length=20), primary_key=True, nullable=False)
-    text = sa.Column(sa.String(length=80), nullable=True)
-
-    def __str__(self):
-        return self.text or ""
-
-
 class BatchType(Base):
     """
     Represents the definition of a batch type.
     """
     __tablename__ = 'batchType'
 
-    # nb. this is *not* autoincrement for some reason; must
-    # calculate new ID manually based on max existing
-    id = sa.Column('batchTypeID', sa.Integer(), nullable=False, primary_key=True, autoincrement=False)
+    id = sa.Column('batchTypeID', sa.Integer(), primary_key=True, autoincrement=False, nullable=False)
 
     description = sa.Column('typeDesc', sa.String(length=50), nullable=True)
 
@@ -1551,7 +1549,7 @@ class BatchType(Base):
 
     special_order_eligible = sa.Column('specialOrderEligible', sa.Boolean(), nullable=True, default=True)
 
-    editor_ui = sa.Column('editorUI', sa.SmallInteger(), nullable=True, default=True)
+    editor_ui = sa.Column('editorUI', sa.Boolean(), nullable=True, default=True)
 
     allow_single_store = sa.Column('allowSingleStore', sa.Boolean(), nullable=True, default=False)
 
@@ -1566,6 +1564,9 @@ class Batch(Base):
     Represents a batch.
     """
     __tablename__ = 'batches'
+    __table_args__ = (
+        sa.ForeignKeyConstraint(['batchType'], ['batchType.batchTypeID']),
+    )
 
     id = sa.Column('batchID', sa.Integer(), primary_key=True, autoincrement=True, nullable=False)
 
@@ -1575,8 +1576,7 @@ class Batch(Base):
 
     name = sa.Column('batchName', sa.String(length=80), nullable=True)
 
-    batch_type_id = sa.Column('batchType', sa.Integer(),
-                              sa.ForeignKey('batchType.batchTypeID'), nullable=True)
+    batch_type_id = sa.Column('batchType', sa.Integer(), nullable=True)
     batch_type = orm.relationship(BatchType)
 
     discount_type = sa.Column('discountType', sa.Integer(), nullable=True)
@@ -1598,18 +1598,16 @@ class BatchItem(Base):
     Represents a batch "list" item.
     """
     __tablename__ = 'batchList'
+    __table_args__ = (
+        sa.ForeignKeyConstraint(['batchID'], ['batches.batchID']),
+    )
 
     id = sa.Column('listID', sa.Integer(), primary_key=True, autoincrement=True, nullable=False)
 
-    batch_id = sa.Column('batchID', sa.Integer(),
-                         sa.ForeignKey('batches.batchID'), nullable=True)
+    batch_id = sa.Column('batchID', sa.Integer(), nullable=True)
     batch = orm.relationship(Batch, backref=orm.backref('items'))
 
     upc = sa.Column(sa.String(length=13), nullable=True)
-    product = orm.relationship(
-        Product,
-        primaryjoin=Product.upc == upc,
-        foreign_keys=[upc])
 
     sale_price = sa.Column('salePrice', sa.Numeric(precision=9, scale=3), nullable=True)
 
@@ -1745,22 +1743,3 @@ class PurchaseOrderNote(Base):
 
     def __str__(self):
         return self.notes or ""
-
-
-# the rest of this is a workaround to deal with the fact that some
-# CORE databases have columns which others do not.  i had assumed that
-# all would be more or less the same but not so in practice.  so if
-# your DB *does* have these columns, you must invoke the function
-# below in order to merge them into your schema.  you should do this
-# on app startup and they'll be available normally from then on.
-
-RUNTIME = {'added_latest_columns': False}
-
-def use_latest_columns():
-    if RUNTIME['added_latest_columns']:
-        return
-
-    MemberType.ignore_sales = sa.Column('ignoreSales', sa.Boolean(), nullable=True, default=False)
-    MemberType.sales_code = sa.Column('salesCode', sa.Integer(), nullable=True)
-
-    RUNTIME['added_latest_columns'] = True
diff --git a/corepos/db/office_trans/model.py b/corepos/db/office_trans/model.py
index c2b0959..20c244c 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 © 2018-2023 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -27,65 +27,101 @@ CORE POS Transaction Data Model
 import sqlalchemy as sa
 from sqlalchemy import orm
 
-from corepos.db.common import trans as common
-
 
 Base = orm.declarative_base()
 
 
-# TODO: not sure what primary key should be for this?  am trying a
-# composite one so far, we'll see...cf. also andy's comments in
-# https://github.com/CORE-POS/IS4C/pull/1189#issuecomment-1597481138
-class StockPurchase(Base):
+class TransactionDetailBase(object):
     """
-    Represents a member equity payment.
+    Represents a POS transaction detail record.
     """
-    __tablename__ = 'stockpurchases'
 
-    card_number = sa.Column('card_no', sa.Integer(), nullable=False, primary_key=True, autoincrement=False)
-
-    amount = sa.Column('stockPurchase', sa.Numeric(precision=10, scale=2), nullable=True)
-
-    datetime = sa.Column('tdate', sa.DateTime(), nullable=True, primary_key=True, autoincrement=False)
-
-    transaction_number = sa.Column('trans_num', sa.String(length=50), nullable=True, primary_key=True)
-
-    transaction_id = sa.Column('trans_id', sa.Integer(), nullable=True)
-
-    department_number = sa.Column('dept', sa.Integer(), nullable=True, primary_key=True, autoincrement=False)
-
-    def __str__(self):
-        return f"#{self.card_number} for ${self.amount}"
-
-
-class EquityLiveBalance(Base):
-
-    __tablename__ = 'equity_live_balance'
-
-    member_number = sa.Column('memnum', sa.Integer(), nullable=False, primary_key=True, autoincrement=False)
-
-    payments = sa.Column(sa.Numeric(precision=10, scale=2), nullable=True)
-
-    start_date = sa.Column('startdate', sa.DateTime(), nullable=True)
-
-
-class DTransactionBase(common.TransactionDetailBase):
-    """
-    Base class for ``dtransactions`` and similar models.
-    """
+    # store
     store_row_id = sa.Column(sa.Integer(), primary_key=True, nullable=False)
-
-    pos_row_id = sa.Column(sa.Integer(), nullable=True)
     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)
+    transaction_status = sa.Column('trans_status', sa.String(length=1), nullable=True)
+
+    # timestamps
     date_time = sa.Column('datetime', sa.DateTime(), nullable=True)
 
+    # cashier
+    employee_number = sa.Column('emp_no', sa.Integer(), nullable=True)
 
-class DTransaction(DTransactionBase, Base):
+    # 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)
+
+    unit_price = sa.Column('unitPrice', sa.Numeric(precision=10, scale=2), nullable=True)
+
+    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.Boolean(), nullable=True)
+
+    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.Boolean(), 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 TransactionDetail(TransactionDetailBase, Base):
     """
-    Data model for ``dtransactions`` table.
+    Represents a POS transaction detail record.
     """
     __tablename__ = 'dtransactions'
-
-
-# TODO: deprecate / remove this
-TransactionDetail = DTransaction
diff --git a/corepos/db/office_trans_archive/__init__.py b/corepos/db/office_trans_archive/__init__.py
index 6ddb31d..e25b200 100644
--- a/corepos/db/office_trans_archive/__init__.py
+++ b/corepos/db/office_trans_archive/__init__.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2023 Lance Edgar
+#  Copyright © 2018-2022 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -24,9 +24,7 @@
 "Archive" Transaction Database Interface
 """
 
-import warnings
-warnings.warn("The `corepos.db.office_trans_archive` module is deprecated!  "
-              "Please use `corepos.db.office_arch` instead.",
-              DeprecationWarning, stacklevel=2)
+from sqlalchemy import orm
 
-from corepos.db.office_arch import *
+
+Session = orm.sessionmaker()
diff --git a/corepos/db/office_trans_archive/model.py b/corepos/db/office_trans_archive/model.py
index e57d071..8f4a079 100644
--- a/corepos/db/office_trans_archive/model.py
+++ b/corepos/db/office_trans_archive/model.py
@@ -24,9 +24,16 @@
 CORE POS Transaction Data Model
 """
 
-import warnings
-warnings.warn("The `corepos.db.office_trans_archive.model` module is deprecated!  "
-              "Please use `corepos.db.office_arch.model` instead.",
-              DeprecationWarning, stacklevel=2)
+from sqlalchemy import orm
 
-from corepos.db.office_arch.model import *
+from corepos.db.office_trans.model import TransactionDetailBase
+
+
+Base = orm.declarative_base()
+
+
+class TransactionDetail(TransactionDetailBase, Base):
+    """
+    Represents a POS transaction detail record.
+    """
+    __tablename__ = 'bigArchive'
diff --git a/corepos/enum.py b/corepos/enum.py
index 93780c3..55619d8 100644
--- a/corepos/enum.py
+++ b/corepos/enum.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2024 Lance Edgar
+#  Copyright © 2018-2019 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -24,43 +24,22 @@
 CORE POS enumeration constants
 """
 
-from collections import OrderedDict
-from enum import Enum
+from __future__ import unicode_literals, absolute_import
+
+try:
+    from collections import OrderedDict
+except ImportError:
+    from ordereddict import OrderedDict
 
 
-class CoreDbType(str, Enum):
-    office_op = 'office_op'
-    office_trans = 'office_trans'
-    office_arch = 'office_arch'
-
-
-BATCH_DISCOUNT_TYPE_TRACKING            = -1
 BATCH_DISCOUNT_TYPE_PRICE_CHANGE        = 0
 BATCH_DISCOUNT_TYPE_SALE_EVERYONE       = 1
 BATCH_DISCOUNT_TYPE_SALE_RESTRICTED     = 2
-BATCH_DISCOUNT_TYPE_SLIDING_PERCENT     = 3
-BATCH_DISCOUNT_TYPE_SLIDING_AMOUNT      = 5
 
 BATCH_DISCOUNT_TYPE = OrderedDict([
-    (BATCH_DISCOUNT_TYPE_PRICE_CHANGE,          "None (Change regular price)"),
+    (BATCH_DISCOUNT_TYPE_PRICE_CHANGE,          "Price Change"),
     (BATCH_DISCOUNT_TYPE_SALE_EVERYONE,         "Sale for everyone"),
-    (BATCH_DISCOUNT_TYPE_SALE_RESTRICTED,       "Sale for Members"),
-    (BATCH_DISCOUNT_TYPE_SLIDING_PERCENT,       "Sliding % Off for Members"),
-    (BATCH_DISCOUNT_TYPE_SLIDING_AMOUNT,        "Sliding $ Off for Members"),
-    (BATCH_DISCOUNT_TYPE_TRACKING,              "Tracking (does not change any prices)"),
-])
-
-
-BATCH_EDITOR_UI_STANDARD                = 1
-BATCH_EDITOR_UI_PAIRED_SALE             = 2
-BATCH_EDITOR_UI_PARTIAL                 = 3
-BATCH_EDITOR_UI_TRACKING                = 4
-
-BATCH_EDITOR_UI = OrderedDict([
-    (BATCH_EDITOR_UI_STANDARD,                  "Standard"),
-    (BATCH_EDITOR_UI_PAIRED_SALE,               "Paired Sale"),
-    (BATCH_EDITOR_UI_PARTIAL,                   "Partial"),
-    (BATCH_EDITOR_UI_TRACKING,                  "Tracking"),
+    (BATCH_DISCOUNT_TYPE_SALE_RESTRICTED,       "Member/Owner only sale"),
 ])
 
 
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index cf50f41..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,49 +0,0 @@
-
-[build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
-
-
-[project]
-name = "pyCOREPOS"
-version = "0.5.1"
-description = "Python Interface to CORE POS"
-readme = "README.md"
-authors = [{name = "Lance Edgar", email = "lance@edbob.org"}]
-license = {text = "GNU GPL v3+"}
-classifiers = [
-        "Development Status :: 3 - Alpha",
-        "Environment :: Console",
-        "Environment :: Web Environment",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
-        "Natural Language :: English",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Topic :: Office/Business",
-        "Topic :: Software Development :: Libraries :: Python Modules",
-]
-
-dependencies = [
-        "mysql-connector-python",
-        "requests",
-        "SQLAlchemy>=1.4",
-]
-
-
-[project.urls]
-Homepage = "https://forgejo.wuttaproject.org/rattail/pycorepos"
-Repository = "https://forgejo.wuttaproject.org/rattail/pycorepos"
-Issues = "https://forgejo.wuttaproject.org/rattail/pycorepos/issues"
-Changelog = "https://forgejo.wuttaproject.org/rattail/pycorepos/src/branch/master/CHANGELOG.md"
-
-
-[tool.commitizen]
-version_provider = "pep621"
-tag_format = "v$version"
-update_changelog_on_bump = true
-
-
-[tool.hatch.build.targets.wheel]
-packages = ["corepos"]
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..728f179
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,33 @@
+# -*- coding: utf-8; -*-
+
+[metadata]
+name = pyCOREPOS
+version = attr: corepos.__version__
+author = Lance Edgar
+author_email = lance@edbob.org
+url = https://rattailproject.org/
+license = GNU GPL v3
+description = Python Interface to CORE POS
+long_description = file: README.rst
+classifiers =
+        Development Status :: 3 - Alpha
+        Environment :: Console
+        Environment :: Web Environment
+        Intended Audience :: Developers
+        License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
+        Natural Language :: English
+        Operating System :: OS Independent
+        Programming Language :: Python
+        Programming Language :: Python :: 3
+        Topic :: Office/Business
+        Topic :: Software Development :: Libraries :: Python Modules
+
+
+[options]
+install_requires =
+        mysql-connector-python
+        requests
+        six
+        SQLAlchemy>=1.4
+
+packages = find:
diff --git a/corepos/db/office_arch/__init__.py b/setup.py
similarity index 89%
rename from corepos/db/office_arch/__init__.py
rename to setup.py
index 70292e9..a02ef90 100644
--- a/corepos/db/office_arch/__init__.py
+++ b/setup.py
@@ -20,11 +20,7 @@
 #  pyCOREPOS.  If not, see <http://www.gnu.org/licenses/>.
 #
 ################################################################################
-"""
-"Archive" Transaction Database Interface
-"""
 
-from sqlalchemy import orm
+from setuptools import setup
 
-
-Session = orm.sessionmaker()
+setup()
diff --git a/tasks.py b/tasks.py
index 6946a7f..a9b9fc3 100644
--- a/tasks.py
+++ b/tasks.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2024 Lance Edgar
+#  Copyright © 2018-2020 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -25,32 +25,20 @@ Tasks for 'pyCOREPOS' package
 """
 
 import os
-import re
 import shutil
 
 from invoke import task
 
 
 here = os.path.abspath(os.path.dirname(__file__))
-__version__ = None
-pattern = re.compile(r'^version = "(\d+\.\d+\.\d+)"$')
-with open(os.path.join(here, 'pyproject.toml'), 'rt') as f:
-    for line in f:
-        line = line.rstrip('\n')
-        match = pattern.match(line)
-        if match:
-            __version__ = match.group(1)
-            break
-if not __version__:
-    raise RuntimeError("could not parse version!")
+exec(open(os.path.join(here, 'corepos', '_version.py')).read())
 
 
 @task
-def release(c):
+def release(ctx):
     """
     Release a new version of 'pyCOREPOS'.
     """
-    if os.path.exists('pyCOREPOS.egg-info'):
-        shutil.rmtree('pyCOREPOS.egg-info')
-    c.run('python -m build --sdist')
-    c.run('twine upload dist/pycorepos-{}.tar.gz'.format(__version__))
+    shutil.rmtree('pyCOREPOS.egg-info')
+    ctx.run('python setup.py sdist --formats=gztar')
+    ctx.run('twine upload dist/pyCOREPOS-{}.tar.gz'.format(__version__))