A: You can use pisg to create nice HTML statistics for your channel. oer/oer+MySQL raw logging is used to produce the statistics so you want to switch on global flag "l". You can combine several oer-.raw files into one big log file with "cat oer-1000.raw oer-1001.raw > channel.log". The oer/oer+MySQL format was included in pisg 0.35. Here is also a example pisg config.
If you use oer+MySQL you will have to dump the contents of the raw table with the following command mysql -N -e "SELECT twhen,message FROM oer_raw" oerdb > channel.log.