How to disable the behavior creating data sources from Rails projects ? (annoyed by many RemoteJdbcServer processes)

environment: IDEA 13.0.3 + Ruby plugin, Mac OS X 10.6.8

I set up many modules with Ruby on Rails facets in a project,
and some of RoR modules contains database.yml with many connection configurations.

One issue. When I launch IDEA 13, it starts to synchronize many data sources which may be automatically imported from database.yml. It runs 30 to 40 java processes (com.intellij.persistence.database.console.RemoteJdbcServer) , then my machine hungs with memory shortage.

Killing those processes from command-line, and removing those data sources, it get back to normal. But restarting IDEA 13, those data sources are shown again in Database tool window and the above behavior appears again.

So, my question is: How can I disable that IDEA 13 creating data sources automatically from database.yml?
or any ideas/solutions on the problem above?

kkbhj