The tables related are listed below, but just so you are aware there is a pre-defined report template showing what is connected where on the network. It's doesn't have the best name in the world so a tough gem to find, but look for the "user tracking report"
The raw data is located in the config_db.imc_config.tbl_l2topo_user_tracking
The report data id in the report db --> views --> plat_v_l2_user_track
Hope that helps
