localstmt=db:prepare(string.format("INSERT INTO %s(time) SELECT :time WHERE NOT EXISTS(SELECT time FROM %s WHERE time=:time);",stat_table,stat_table))
stmt:bind_names{time=key}
stmt:step()
stmt:finalize()
localupdate_stat_stmt=db:prepare(string.format("INSERT INTO %s(time) SELECT :time WHERE NOT EXISTS(SELECT time FROM %s WHERE time=:time);",stat_table,stat_table))