diff --git a/src/Infrastructure/OpcUa/MetadataLoaderService.cs b/src/Infrastructure/OpcUa/MetadataLoaderService.cs
index 26642ad..7ede22a 100644
--- a/src/Infrastructure/OpcUa/MetadataLoaderService.cs
+++ b/src/Infrastructure/OpcUa/MetadataLoaderService.cs
@@ -37,6 +37,13 @@ public class MetadataLoaderService : IMetadataLoaderService
         var baseTagSet = baseTags.ToHashSet(StringComparer.OrdinalIgnoreCase);
         if (baseTagSet.Count == 0) return 0;
 
+        // ── Step 0: realtime_table에 없는 orphan base_tag 삭제 ─────────────
+        await _ctx.Database.ExecuteSqlRawAsync(@"
+            DELETE FROM tag_metadata
+            WHERE base_tag NOT IN (
+                SELECT DISTINCT LOWER(split_part(tagname, '.', 1)) FROM realtime_table
+            )");
+
         // ── Step 1: node_map_master에서 실제 node_id 조회 ──────────────────
         // hostname을 직접 조성하지 않고 DB에 저장된 원본 node_id를 사용
         var masterNodes = await _ctx.NodeMapMasters
diff --git a/src/Web/wwwroot/index.html b/src/Web/wwwroot/index.html
index 3661765..560b015 100644
--- a/src/Web/wwwroot/index.html
+++ b/src/Web/wwwroot/index.html
@@ -686,7 +686,7 @@
             태그의 desc, area, state descriptor 정보를 OPC UA에서 조회하여 저장합니다.
           </p>
           <div class="btn-row">
-            <button class="btn-a" onclick="metaReload()">🔄 메타데이터 로드</button>
+            <button class="btn-a" onclick="metaReload()">🔄 메타데이터 갱신</button>
             <button class="btn-b" onclick="metaView()">📋 메타데이터 조회</button>
           </div>
           <div id="meta-log" class="logbox hidden" style="margin-top:8px"></div>
diff --git a/src/Web/wwwroot/js/app.js b/src/Web/wwwroot/js/app.js
index 605976c..53a6a87 100644
--- a/src/Web/wwwroot/js/app.js
+++ b/src/Web/wwwroot/js/app.js
@@ -954,7 +954,7 @@ async function metaReload() {
   };
   const logEl = document.getElementById('meta-log');
   logEl.classList.remove('hidden');
-  logEl.innerHTML = '<div class="ll inf">⏳ 메타데이터 재로드 중...</div>';
+  logEl.innerHTML = '<div class="ll inf">⏳ 메타데이터 갱신 중...</div>';
   try {
     const d = await api('POST', '/api/tags/metadata/reload', body);
     logEl.innerHTML = `<div class="ll ${d.success ? 'ok' : 'err'}">${d.success ? '✅' : '❌'} ${esc(d.message)}</div>`;