Add decorator for session management.

accountant/__init__.py

@@ -46,6 +46,16 @@ def session_scope():
     finally:
         session.close()
 
+
+def session_aware(f):
+    def wrapper(*args, **kwargs):
+        with session_scope() as session:
+            kwargs['session'] = session
+
+            return f(*args, **kwargs)
+    return wrapper
+
+
 # Must be after db declaration because the blueprints may need it.
 from .api import api
 from .frontend import frontend