diff --git a/rhodecode/lib/dbmigrate/migrate/changeset/schema.py b/rhodecode/lib/dbmigrate/migrate/changeset/schema.py
--- a/rhodecode/lib/dbmigrate/migrate/changeset/schema.py
+++ b/rhodecode/lib/dbmigrate/migrate/changeset/schema.py
@@ -349,10 +349,7 @@ class ColumnDelta(DictMixin, sqlalchemy.
     def process_column(self, column):
         """Processes default values for column"""
         # XXX: this is a snippet from SA processing of positional parameters
-        if not SQLA_06 and column.args:
-            toinit = list(column.args)
-        else:
-            toinit = list()
+        toinit = list()
 
         if column.server_default is not None:
             if isinstance(column.server_default, sqlalchemy.FetchedValue):
@@ -368,9 +365,6 @@ class ColumnDelta(DictMixin, sqlalchemy.
         if toinit:
             column._init_items(*toinit)
 
-        if not SQLA_06:
-            column.args = []
-
     def _get_table(self):
         return getattr(self, '_table', None)
 
@@ -469,14 +463,18 @@ class ChangesetTable(object):
         self._set_parent(self.metadata)
 
     def _meta_key(self):
+        """Get the meta key for this table."""
         return sqlalchemy.schema._get_table_key(self.name, self.schema)
 
     def deregister(self):
         """Remove this table from its metadata"""
-        key = self._meta_key()
-        meta = self.metadata
-        if key in meta.tables:
-            del meta.tables[key]
+        if SQLA_07:
+            self.metadata._remove_table(self.name, self.schema)
+        else:
+            key = self._meta_key()
+            meta = self.metadata
+            if key in meta.tables:
+                del meta.tables[key]
 
 
 class ChangesetColumn(object):