Тестировалось на SVN-HG (325-635) => TPII (R200)
UPDATE bb_users SET user_sig = REPLACE( user_sig, user_sig_bbcode_uid, '1515dfsgdsf1g5' ), user_sig = REPLACE( user_sig, ':1515dfsgdsf1g5', '' );
#1270 - Illegal mix of collations (utf8_general_ci,IMPLICIT), (utf8_unicode_ci,IMPLICIT), (utf8_general_ci,COERCIBLE) for operation 'replace'
UPDATE bb_users SET user_sig = REPLACE( user_sig, user_sig_bbcode_uid, '1515dfsgdsf1g5' ) ,
user_sig = REPLACE( user_sig, ':1515dfsgdsf1g5', '' ) ;
UPDATE `bb_users` SET `user_password` = MD5(user_password);