Method delete

nodedb/src/engine/sparse/btree.rs:284–314

Delete a document (tenant-scoped). Returns the prior bytes when a row was actually removed, or `None` when nothing matched. The Event Plane needs the prior bytes as the `old_value` for CDC/trigger delete events; returning them here avoids a second read pass in the handler.

(
        &self,
        tenant_id: u64,
        collection: &str,
        document_id: &str,
    )

    /// `old_value` for CDC/trigger delete events; returning them here
    /// avoids a second read pass in the handler.
    pub fn delete(
        &self,
        tenant_id: u64,
        collection: &str,
        document_id: &str,
    ) -> crate::Result<Option<Vec<u8>>> {
        with_tenant_key(tenant_id, collection, document_id, |key| {
            let write_txn = self
                .db
                .begin_write()
                .map_err(|e| redb_err("write txn", e))?;
            let prior = {
                let mut table = write_txn
                    .open_table(DOCUMENTS)
                    .map_err(|e| redb_err("open table", e))?;
                table
                    .remove(key)
                    .map_err(|e| redb_err("remove", e))?
                    .map(|g| g.value().to_vec())
            };
            write_txn.commit().map_err(|e| redb_err("commit", e))?;

            debug!(
                collection,
                document_id,
                removed = prior.is_some(),
                "document delete"
            );
            Ok(prior)
        })
    }

    /// Begin a write transaction on the underlying database.
    pub fn begin_write(&self) -> crate::Result<WriteTransaction> {