Method gdpr_erase_cell

nodedb/src/engine/array/write.rs:58–75

GDPR-erase a single cell at `(array, coord, system_from_ms)`. Writes the `CELL_GDPR_ERASURE_SENTINEL` (`0xFE`) into the memtable as a new tile version at `system_from_ms`. Any read at `system_as_of >= system_from_ms` returns `CeilingResult::Erased` for this coord. The sentinel is physically removed by compaction once the tile version falls outside the array's `audit_retain_ms` horizon. This is e

(
        &mut self,
        id: &ArrayId,
        coord: Vec<nodedb_array::types::coord::value::CoordValue>,
        system_from_ms: i64,
        wal_lsn: u64,
    )

    /// This is equivalent to calling `delete_cells` with `erasure: true`
    /// on a single cell, exposed as a named method for clarity at call sites.
    pub fn gdpr_erase_cell(
        &mut self,
        id: &ArrayId,
        coord: Vec<nodedb_array::types::coord::value::CoordValue>,
        system_from_ms: i64,
        wal_lsn: u64,
    ) -> ArrayEngineResult<()> {
        use super::wal::ArrayDeleteCell;
        self.delete_cells(
            id,
            vec![ArrayDeleteCell {
                coord,
                system_from_ms,
                erasure: true,
            }],
            wal_lsn,
        )
    }

    pub(super) fn maybe_flush(&mut self, id: &ArrayId) -> ArrayEngineResult<()> {
        let stats = self.store(id)?.memtable.stats();