Add CORE-specific datetime for equity payments

in case payments are added to CORE on a later date, want to keep
original timestamp separate

rattail_corepos/db/alembic/versions/d426a274f0c2_add_equity_payment_corepos_datetime.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8; -*-
+"""add equity_payment.corepos_datetime
+
+Revision ID: d426a274f0c2
+Revises: 93978a7adc66
+Create Date: 2023-09-13 20:59:42.706994
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'd426a274f0c2'
+down_revision = '93978a7adc66'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+import rattail.db.types
+
+
+
+def upgrade():
+
+    # corepos_member_equity_payment
+    op.add_column('corepos_member_equity_payment', sa.Column('corepos_datetime', sa.DateTime(), nullable=True))
+    op.add_column('corepos_member_equity_payment_version', sa.Column('corepos_datetime', sa.DateTime(), autoincrement=False, nullable=True))
+
+
+def downgrade():
+
+    # corepos_member_equity_payment
+    op.drop_column('corepos_member_equity_payment_version', 'corepos_datetime')
+    op.drop_column('corepos_member_equity_payment', 'corepos_datetime')