Notes. Summary of the X-ray monitoring campaigns for each source and their tentative nature. We categorized the sources according to their number of X-ray follow-ups. eROSITA-only (Column 2) are sources that only have eROSITA data and will be observed in future programs. eROSITA+short program (Column 3), and eROSITA+long program (Column 4) are the sources where we have less or more than six X-ray pointings after the eROSITA data, respectively. We mark as periodic signals (Column 5) those sources where the data do not rule out the possibility of periodicity. This column also includes sources where we only have eROSITA data since more data are required to confirm or rule out quasiperiodic signals. The possible nature of the sources is divided into three categories. HLXs (Column 6), nuclear transients (e.g., TDEs & QPEs; Column 7), and SMBHBs (Column 8). We mark the sources where the data have not entirely ruled out the possibility that the source possesses a given nature.