Gigas adds weapons that delete stars. To debug or cheat your way out of a supernova:
: effect set_global_flag = giga_core_qso (converts black hole to active quasar). stellaris gigastructural engineering console commands link
Active Quasar (for the Quasi-Stellar Obliterator): effect set_global_flag = giga_core_qso . Gigas adds weapons that delete stars