request #10106 has introduced a new storage format for the Git access logs and the deployment guide of Tuleap 9.7 advise to convert the existing data.
However you are very likely to encounter the following error while trying to import the data:
Fatal error: Uncaught exception 'DataAccessQueryException' with message 'DB error ==> INSERT INTO plugin_git_log_read_daily(repository_id, user_id, day, git_read)
SELECT repository_id, user_id, DATE_FORMAT(FROM_UNIXTIME(time), '%Y%m%d') as day, count(*)
FROM plugin_git_full_history
WHERE time > YYYYYYYYYY AND time <= XXXXXXXXXXX
GROUP BY repository_id, user_id, day @@ /usr/share/tuleap/src/common/dao/include/DataAccessObject.class.php at line 148' in /usr/share/tuleap/src/common/dao/include/DataAccessObject.class.php:154
Stack trace:
#0 /usr/share/tuleap/src/common/dao/include/DataAccessObject.class.php(148): DataAccessObject->handleError(Object(DataAccessResult), 'INSERT INTO plu...')
#1 /usr/share/tuleap/plugins/git/include/Git/Gitolite/GitoliteFullLogsToAggregatedLogs.php(68): DataAccessObject->update('INSERT INTO plu...')
#2 /usr/share/tuleap/plugins/git/include/Git/Gitolite/GitoliteFullLogsToAggregatedLogs.php(50): Tuleap\Git\Gitolite\GitoliteFullLogsToAggregatedLogs->updateBetw in /usr/share/tuleap/src/common/dao/include/DataAccessObject.class.php on line 154