Credit rating agency AM Best has upgraded the credit ratings of the Fortegra Group, Inc., a wholly owned subsidiary of DB Insurance Co., Ltd. (DBI), who acquired the specialty insurer back in June. AM Best has removed from under review with positive implications and upgraded the Financial Strength Rating (FSR) to A (Excellent) from A- (Excellent) and the Long-Term Issuer Credit Ratings (Long-Term ICRs) to “a” (Excellent) from “a-” (Excellent) of…