Method delete_cell

nodedb/src/engine/array/memtable/tile_buffer.rs:232–245

Append a tombstone version for `(coord, system_from_ms)`. Creates a new tile-version entry in the memtable; does NOT mutate any earlier version for this coord.

(
        &mut self,
        schema: &ArraySchema,
        coord: Vec<CoordValue>,
        system_from_ms: i64,
        lsn: u64,
    )

    /// new tile-version entry in the memtable; does NOT mutate any earlier
    /// version for this coord.
    pub fn delete_cell(
        &mut self,
        schema: &ArraySchema,
        coord: Vec<CoordValue>,
        system_from_ms: i64,
        lsn: u64,
    ) -> ArrayResult<TileId> {
        let tile = tile_id_for_cell(schema, &coord, system_from_ms)?;
        self.tiles
            .entry(tile)
            .or_default()
            .push_tombstone(&coord, lsn)?;
        Ok(tile)
    }

    /// Append a GDPR erasure version for `(coord, system_from_ms)`. Writes
    /// the `0xFE` sentinel rather than the `0xFF` tombstone. The ceiling