DB and PSI connections (C#, 2007)

[עמרי]

1) Where (in the DB or where can I see it in the PSI) is the link between
Project (PROJ_UID) and the security category that it's assign to?
2) Where (in the DB or where can I see it in the PSI) is the link between
Project (PROJ_UID) and his Time Sheet (tsUID)?
3) Where (in the DB or where can I see it in the PSI) is the link between
Project (PROJ_UID) and his Resources (RES_UID)?

Thanks,
Omri