[galaxy-dev] id to output path query

Hi, I was wondering what the id refers to in the in the history of the galaxy web interface. So for example: http://domain/root/edit?id=96 which key does this refer to and in which table? I am trying to construct a query which will return the (user generated) name of the output, the command that ran it and the path of the .dat file. Can any one give some pointers and/or point me to a schema diagram? Thanks a lot! Steve