Add tender importer from CORE; apply tender in CORE POS batch

still some work to be done yet but getting there

rattail_corepos/db/model/__init__.py

@@ -24,7 +24,7 @@
 Database schema extensions for CORE-POS integration
 """
 
-from .stores import CoreStore
+from .stores import CoreStore, CoreTender
 from .people import (CorePerson, CoreCustomer, CoreCustomerShopper,
                      CoreMember, CoreMemberEquityPayment)
 from .products import (CoreDepartment, CoreSubdepartment,

rattail_corepos/db/model/stores.py

@@ -63,3 +63,38 @@ class CoreStore(model.Base):
         return str(self.store)
 
 CoreStore.make_proxy(model.Store, '_corepos', 'corepos_id')
+
+
+class CoreTender(model.Base):
+    """
+    CORE-specific extensions to :class:`rattail:rattail.db.model.Tender`.
+    """
+    __tablename__ = 'corepos_tender'
+    __table_args__ = (
+        sa.ForeignKeyConstraint(['uuid'], ['tender.uuid'],
+                                name='corepos_tender_fk_tender'),
+    )
+    __versioned__ = {}
+
+    uuid = model.uuid_column(default=None)
+    tender = orm.relationship(
+        model.Tender,
+        doc="""
+        Reference to the actual tender record, which this one extends.
+        """,
+        backref=orm.backref(
+            '_corepos',
+            uselist=False,
+            cascade='all, delete-orphan',
+            doc="""
+            Reference to the CORE-POS extension record for this tender.
+            """))
+
+    corepos_id = sa.Column(sa.Integer(), nullable=False, doc="""
+    ``tenders.TenderID`` value for this tender, within CORE-POS.
+    """)
+
+    def __str__(self):
+        return str(self.tender)
+
+CoreTender.make_proxy(model.Tender, '_corepos', 'corepos_id')