JDBCStore tracks directories via include/exclude. JDBCStore includes the styles/ folder in order to store style (.sld) files and external graphics.
However, the styles/ folder already contains mixed xml configuration (for the StyleInfo objects) and style files. This means that in addition to storeing style files and external graphics (as expected) JDBCStore is also storing style configuration (NOT expected).
While this behavior doesn't seem to cause any problems, it is suboptimal.