It is strange that it disappeared. You can create it again with this SQL:
CREATE TABLE `opengoo`.`og_gs_fontStyles` (
`FontStyleId` int(11) NOT NULL,
`BookId` int(11) NOT NULL,
`FontId` int(11) NOT NULL,
`FontSize` decimal(8,1) NOT NULL default '10.0',
`FontBold` tinyint(1) NOT NULL default '0',
`FontItalic` tinyint(1) NOT NULL default '0',
`FontUnderline` tinyint(1) NOT NULL default '0',
`FontColor` varchar(6) collate utf8_unicode_ci NOT NULL default '',
PRIMARY KEY USING BTREE (`FontStyleId`,`BookId`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci