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db.py

@@ -47,6 +47,7 @@ class DataBase():
     def close_connection(self, exception=None):
         db = g.pop('database', None)
         if db is not None:
+            db.rollback()
             self._pool.putconn(db)
 
     def execute(self, query, args=(), one=False, commit=False):
@@ -429,8 +430,8 @@ class DataBase():
             WHERE
                 W.person_id = %s 
                 AND E.exercise_id = %s AND
-                (%s IS NULL OR W.start_date >= %s) AND
-                (%s IS NULL OR W.start_date <= %s)
+                (%s::date IS NULL OR W.start_date >= %s::date) AND
+                (%s::date IS NULL OR W.start_date <= %s::date)
             ORDER BY 
                 W.start_date;
         """, [person_id, exercise_id, min_date, min_date, max_date, max_date])