diff --git a/rust/index/src/spann/types.rs b/rust/index/src/spann/types.rs
index bf11661eb771..a91d7c4283dd 100644
--- a/rust/index/src/spann/types.rs
+++ b/rust/index/src/spann/types.rs
@@ -900,6 +900,22 @@ impl SpannIndexWriter {
         self.add_postings_list(id, version, embedding).await
     }
 
+    pub async fn update(
+        &self,
+        id: u32,
+        embedding: &[f32],
+    ) -> Result<(), SpannIndexWriterConstructionError> {
+        // Delete and then add.
+        self.delete(id).await?;
+        self.add(id, embedding).await
+    }
+
+    pub async fn delete(&self, id: u32) -> Result<(), SpannIndexWriterConstructionError> {
+        let mut version_map_guard = self.versions_map.write();
+        version_map_guard.versions_map.insert(id, 0);
+        Ok(())
+    }
+
     // TODO(Sanket): Change the error types.
     pub async fn commit(self) -> Result<SpannIndexFlusher, SpannIndexWriterConstructionError> {
         // Pl list.
diff --git a/rust/worker/src/segment/spann_segment.rs b/rust/worker/src/segment/spann_segment.rs
index 56593a75853f..fdfce848dab5 100644
--- a/rust/worker/src/segment/spann_segment.rs
+++ b/rust/worker/src/segment/spann_segment.rs
@@ -204,6 +204,26 @@ impl SpannSegmentWriter {
             .await
             .map_err(|_| SpannSegmentWriterError::SpannSegmentWriterAddRecordError)
     }
+
+    async fn delete(
+        &self,
+        record: &MaterializedLogRecord<'_>,
+    ) -> Result<(), SpannSegmentWriterError> {
+        self.index
+            .delete(record.offset_id)
+            .await
+            .map_err(|_| SpannSegmentWriterError::SpannSegmentWriterAddRecordError)
+    }
+
+    async fn update(
+        &self,
+        record: &MaterializedLogRecord<'_>,
+    ) -> Result<(), SpannSegmentWriterError> {
+        self.index
+            .update(record.offset_id, record.merged_embeddings())
+            .await
+            .map_err(|_| SpannSegmentWriterError::SpannSegmentWriterAddRecordError)
+    }
 }
 
 struct SpannSegmentFlusher {
@@ -222,10 +242,20 @@ impl<'a> SegmentWriter<'a> for SpannSegmentWriter {
                         .await
                         .map_err(|_| ApplyMaterializedLogError::BlockfileSet)?;
                 }
-                // TODO(Sanket): Implement other operations.
-                _ => {
-                    todo!()
+                MaterializedLogOperation::UpdateExisting
+                | MaterializedLogOperation::OverwriteExisting => {
+                    self.update(record)
+                        .await
+                        .map_err(|_| ApplyMaterializedLogError::BlockfileUpdate)?;
+                }
+                MaterializedLogOperation::DeleteExisting => {
+                    self.delete(record)
+                        .await
+                        .map_err(|_| ApplyMaterializedLogError::BlockfileDelete)?;
                 }
+                MaterializedLogOperation::Initial => panic!(
+                    "Invariant violation. Mat records should not contain logs in initial state"
+                ),
             }
         }
         Ok(())