--- a/cubicweb/server/test/data-migractions/cubicweb_fakecustomtype/site_cubicweb.py	Wed Dec 18 05:39:03 2019 +0100
+++ b/cubicweb/server/test/data-migractions/cubicweb_fakecustomtype/site_cubicweb.py	Thu Dec 19 15:13:10 2019 +0100
@@ -1,6 +1,5 @@
 from yams import register_base_type
 from logilab.database import get_db_helper
-from logilab.database.sqlgen import SQLExpression
 
 _NUMERIC_PARAMETERS = {'scale': 0, 'precision': None}
 register_base_type('Numeric', _NUMERIC_PARAMETERS)
@@ -14,4 +13,5 @@
     """
     return 'numeric(%s, %s)' % (rdef.precision, rdef.scale)
 
+
 pghelper.TYPE_MAPPING['Numeric'] = pg_numeric_sqltype