Add the ability to specify __tablename__ for SQLALchemy tables.

Author: ryanpetrello

celery/app/defaults.py

@@ -125,6 +125,8 @@ def __repr__(self):
         'REDIS_MAX_CONNECTIONS': Option(type='int'),
         'RESULT_BACKEND': Option(type='string'),
         'RESULT_DB_SHORT_LIVED_SESSIONS': Option(False, type='bool'),
+        'RESULT_DB_TASK_TABLENAME': Option('celery_taskmeta'),
+        'RESULT_DB_TASKSET_TABLENAME': Option('celery_tasksetmeta'),
         'RESULT_DBURI': Option(),
         'RESULT_ENGINE_OPTIONS': Option(type='dict'),
         'RESULT_EXCHANGE': Option('celeryresults'),

celery/backends/database/__init__.py

@@ -69,6 +69,10 @@ def __init__(self, dburi=None, expires=None,
             'short_lived_sessions',
             conf.CELERY_RESULT_DB_SHORT_LIVED_SESSIONS,
         )
+
+        Task.__table__.name = conf.CELERY_RESULT_DB_TASK_TABLENAME
+        TaskSet.__table__.name = conf.CELERY_RESULT_DB_TASKSET_TABLENAME
+
         if not self.dburi:
             raise ImproperlyConfigured(
                 'Missing connection string! Do you have '