Revert " Test theory, that the coupling of redis to sql is what cause…

…s unittest to become deadlocked when trying to drop all tables."

This reverts commit fe0fca4.

portal/database.py

@@ -4,7 +4,4 @@
 from flask_sqlalchemy import SQLAlchemy
 from flask_sqlalchemy_caching import CachingQuery
 
-# Test theory, that the coupling of redis to sql is what causes
-# unittests to become deadlocked when trying to drop all tables
-#db = SQLAlchemy(query_class=CachingQuery)
-db = SQLAlchemy()
+db = SQLAlchemy(query_class=CachingQuery)