GetTombstoneCount
GetTombstoneCount returns how many soft-deleted threads in a channel are still awaiting hard-GC (read-only; lets ops/indexers decide when to call SweepTombstones).
Command
gnokey query vm/qeval -remote "https://rpc.topaz.testnets.gno.land" -data "gno.land/r/samcrew/memba_dao_channels_v2.GetTombstoneCount()"
Result