a history syncer process has stuck in a loop :

11431:20110913:105719.952 Database is down. Retrying in 10 seconds.
11431:20110913:105729.958 [Z3005] query failed: [1062] Duplicate entry '23099-1315738800' for key 1 [insert into trends (itemid,clock,num,value_min,value_avg,value_max) values (23099,1315738800,1,3.400000,3.400000,3.400000);]