Add employee importer for CORE -> Rattail, and CORE cashier auth handler

rattail_corepos/db/model/people.py

@@ -65,6 +65,41 @@ class CorePerson(model.Base):
 CorePerson.make_proxy(model.Person, '_corepos', 'corepos_customer_id')
 
 
+class CoreEmployee(model.Base):
+    """
+    CORE-specific extensions to :class:`~rattail:rattail.db.model.Employee`
+    """
+    __tablename__ = 'corepos_employee'
+    __table_args__ = (
+        sa.ForeignKeyConstraint(['uuid'], ['employee.uuid'],
+                                name='corepos_employee_fk_employee'),
+    )
+    __versioned__ = {}
+
+    uuid = model.uuid_column(default=None)
+    employee = orm.relationship(
+        model.Employee,
+        doc="""
+        Reference to the actual employee 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 employee.
+            """))
+
+    corepos_number = sa.Column(sa.Integer(), nullable=True, doc="""
+    ``employees.emp_no`` value for this employee, within CORE-POS.
+    """)
+
+    def __str__(self):
+        return str(self.employee)
+
+CoreEmployee.make_proxy(model.Employee, '_corepos', 'corepos_number')
+
+
 class CoreCustomer(model.Base):
     """
     CORE-specific extensions to :class:`rattail:rattail.db.model.Customer`.