perf(electron): add index for updates (#6951)

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/T2klNLEk0wxLh4NRDzhk/cd2e982a-f78a-4cc3-b090-ee4c0090e19d.png)

Above image shows the performance on querying a 20k rows of updates table, which is super slow at 150+ms. After adding index for doc_id the performance should be greatly improved.

After:
![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/T2klNLEk0wxLh4NRDzhk/45ea4389-1833-4dc5-bd64-84d8c99cd647.png)

fix TOV-866

packages/frontend/native/src/sqlite/mod.rs

@@ -73,6 +73,7 @@ impl SqliteConnection {
       .await
       .map_err(anyhow::Error::from)?;
     self.migrate_add_doc_id().await?;
+    self.migrate_add_doc_id_index().await?;
     connection.detach();
     Ok(())
   }
@@ -145,6 +146,25 @@ impl SqliteConnection {
     Ok(updates)
   }
 
+  #[napi]
+  pub async fn delete_updates(&self, doc_id: Option<String>) -> napi::Result<()> {
+    match doc_id {
+      Some(doc_id) => {
+        sqlx::query!("DELETE FROM updates WHERE doc_id = ?", doc_id)
+          .execute(&self.pool)
+          .await
+          .map_err(anyhow::Error::from)?;
+      }
+      None => {
+        sqlx::query!("DELETE FROM updates WHERE doc_id is NULL")
+          .execute(&self.pool)
+          .await
+          .map_err(anyhow::Error::from)?;
+      }
+    };
+    Ok(())
+  }
+
   #[napi]
   pub async fn get_updates_count(&self, doc_id: Option<String>) -> napi::Result<i32> {
     let count = match doc_id {
@@ -361,4 +381,17 @@ impl SqliteConnection {
       }
     }
   }
+
+  pub async fn migrate_add_doc_id_index(&self) -> napi::Result<()> {
+    // ignore errors
+    match sqlx::query("CREATE INDEX IF NOT EXISTS idx_doc_id ON updates(doc_id);")
+      .execute(&self.pool)
+      .await
+    {
+      Ok(_) => Ok(()),
+      Err(err) => {
+        Err(anyhow::Error::from(err).into()) // Propagate other errors
+      }
+    }
+  }
 }