diff --git a/src-tauri/src/mcp.rs b/src-tauri/src/mcp.rs
index 97f6cbb..41b28cb 100644
--- a/src-tauri/src/mcp.rs
+++ b/src-tauri/src/mcp.rs
@@ -317,7 +317,7 @@
     let results = db
         .query_all(Statement::from_sql_and_values(
             DatabaseBackend::Sqlite,
-            "SELECT i.id, i.content, i.path, v.distance
+            "SELECT i.id, i.content, i.path, i.created_at, i.updated_at, v.distance
          FROM vec_items v
          JOIN items i ON v.id = i.id
          WHERE embedding MATCH ?
@@ -333,6 +333,8 @@
             "id": res.try_get::<i32>("", "id").map_err(|e| anyhow::anyhow!(e))?,
             "content": res.try_get::<String>("", "content").map_err(|e| anyhow::anyhow!(e))?,
             "path": res.try_get::<Option<String>>("", "path").map_err(|e| anyhow::anyhow!(e))?,
+            "created_at": res.try_get::<String>("", "created_at").map_err(|e| anyhow::anyhow!(e))?,
+            "updated_at": res.try_get::<String>("", "updated_at").map_err(|e| anyhow::anyhow!(e))?,
             "distance": res.try_get::<f64>("", "distance").map_err(|e| anyhow::anyhow!(e))?
         }));
     }
@@ -356,3 +358,41 @@
         "content": [{ "type": "text", "text": text }]
     }))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    #[test]
+    fn test_list_tools_format() {
+        let req = JsonRpcRequest {
+            jsonrpc: "2.0".to_string(),
+            method: "tools/list".to_string(),
+            params: json!({}),
+            id: Some(json!(1)),
+        };
+        assert_eq!(req.method, "tools/list");
+    }
+
+    #[test]
+    fn test_search_response_structure() {
+        let results = vec![json!({
+            "id": 1,
+            "content": "test content",
+            "path": "/test/path",
+            "created_at": "2024-02-07 15:00:00",
+            "updated_at": "2024-02-07 15:00:00",
+            "distance": 0.1
+        })];
+
+        let response_body = json!({
+            "content": [{ "type": "text", "text": serde_json::to_string_pretty(&results).unwrap() }]
+        });
+
+        assert!(response_body.get("content").is_some());
+        let text = response_body["content"][0]["text"].as_str().unwrap();
+        assert!(text.contains("created_at"));
+        assert!(text.contains("2024-02-07 15:00:00"));
+    }
+}
diff --git a/src/backend/config.js b/src/backend/config.js
index a7a0010..bd7b687 100644
--- a/src/backend/config.js
+++ b/src/backend/config.js
@@ -27,7 +27,7 @@
 
   // ベクトルDB
   database: {
-    filename: "vector.db",
+    filename: process.env.DB_PATH || "vector.db",
     embeddingDim: Number(process.env.VEC_DIM ?? 3),
   },
 
diff --git a/src/backend/db.js b/src/backend/db.js
index d10209f..0f55572 100644
--- a/src/backend/db.js
+++ b/src/backend/db.js
@@ -32,8 +32,8 @@
         id INTEGER PRIMARY KEY,
         content TEXT NOT NULL,
         path TEXT,
-        created_at TEXT DEFAULT (datetime('now')),
-        updated_at TEXT DEFAULT (datetime('now'))
+        created_at TEXT DEFAULT (datetime('now', 'localtime')),
+        updated_at TEXT DEFAULT (datetime('now', 'localtime'))
       );
       CREATE VIRTUAL TABLE IF NOT EXISTS vec_items USING vec0(
         id INTEGER PRIMARY KEY,
@@ -119,3 +119,4 @@
 
 // エクスポート（後方互換性）
 export { db as default };
+