diff -rup Beaker-1.9.1-orig/beaker/ext/database.py Beaker-1.9.1/beaker/ext/database.py
--- Beaker-1.9.1-orig/beaker/ext/database.py	2018-05-22 18:22:34.802619619 +0200
+++ Beaker-1.9.1/beaker/ext/database.py	2018-05-22 17:07:14.048335196 +0200
@@ -91,7 +91,8 @@ class DatabaseNamespaceManager(OpenResou
                              sa.Column('created', types.DateTime, nullable=False),
                              sa.Column('data', types.PickleType, nullable=False),
                              sa.UniqueConstraint('namespace'),
-                             schema=schema_name if schema_name else meta.schema
+                             schema=schema_name if schema_name else meta.schema,
+                             extend_existing=True
             )
             cache.create(checkfirst=True)
             return cache