feat(smartdb): add operation log APIs, point-in-time revert support, and a web-based debug dashboard

rust/crates/rustdb-commands/src/handlers/delete_handler.rs

@@ -2,6 +2,7 @@ use std::collections::HashSet;
 
 use bson::{doc, Bson, Document};
 use rustdb_query::QueryMatcher;
+use rustdb_storage::OpType;
 use tracing::debug;
 
 use crate::context::CommandContext;
@@ -171,6 +172,16 @@ async fn delete_matching(
             .await
             .map_err(|e| CommandError::StorageError(e.to_string()))?;
 
+        // Record in oplog.
+        ctx.oplog.append(
+            OpType::Delete,
+            db,
+            coll,
+            &id_str,
+            None,
+            Some(doc.clone()),
+        );
+
         // Update index engine.
         if let Some(mut engine) = ctx.indexes.get_mut(ns_key) {
             engine.on_delete(doc);