Quark uses and relies upon the transaction module, something at the end of the wsgi request needs to commit the transaction, or transaction aware databases (MySQL InnoDB, Postgres, et. al) will never commit.
The following quantum api-paste.ini enables repoze.tm2 to in the pipeline after authentication so transactions are started coming up the pipeline and commited coming down
[composite:quantum]
use = egg:Paste#urlmap
/: quantumversions
/v2.0: quantumapi_v2_0
[composite:quantumapi_v2_0]
use = call:quantum.auth:pipeline_factory
noauth = egg:repoze.tm2#tm extensions quantumapiapp_v2_0
keystone = authtoken keystonecontext egg:repoze.tm2#tm extensions quantumapiapp_v2_0
[filter:keystonecontext]
paste.filter_factory = quantum.auth:QuantumKeystoneContext.factory
[filter:authtoken]
paste.filter_factory = keystoneclient.middleware.auth_token:filter_factory
[filter:extensions]
paste.filter_factory = quantum.api.extensions:plugin_aware_extension_middleware_factory
[app:quantumversions]
paste.app_factory = quantum.api.versions:Versions.factory
[app:quantumapiapp_v2_0]
paste.app_factory = quantum.api.v2.router:APIRouter.factory