[ADD] migration script

and a module that takes care of saving imported files (+migration)

account_bank_statement_import/migrations/8.0.1.0/post-migrate.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    OpenERP, Open Source Management Solution
+#    This module copyright (C) 2015 Therp BV <http://therp.nl>.
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program 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 Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+
+def migrate(cr, version):
+    # if we end up here, we migrate from 7.0's account_banking
+    # set transaction ids, taking care to enforce uniqueness
+    cr.execute(
+        """update account_bank_statement_line l set unique_import_id=l1.trans
+        from (
+            select distinct
+            first_value(id) over (partition by trans) id, trans
+            from account_bank_statement_line
+        ) l1
+        where l.id=l1.id""")