# 5. OPC UA 서버 기능 (Phase 1) — 완료

src/Core/Application/Interfaces/IExperionServices.cs

@@ -69,6 +69,10 @@ public interface IExperionDbService
     Task<IEnumerable<string>> GetTagNamesAsync();
     Task<HistoryQueryResult>  QueryHistoryAsync(
         IEnumerable<string> tagNames, DateTime? from, DateTime? to, int limit);
+
+    // ── OPC UA Server 지원 ────────────────────────────────────────────────────
+    /// <summary>realtime_table × node_map_master 조인 → nodeId → dataType 사전 반환</summary>
+    Task<IReadOnlyDictionary<string, string>> GetRealtimeNodeDataTypesAsync();
 }
 
 // ── Realtime Service ─────────────────────────────────────────────────────────
@@ -87,6 +91,24 @@ public interface IExperionRealtimeService
 
 public record RealtimeServiceStatus(bool Running, int SubscribedCount, string Message);
 
+// ── OPC UA Server ─────────────────────────────────────────────────────────────
+
+public interface IExperionOpcServerService
+{
+    Task StartServerAsync();
+    Task StopServerAsync();
+    OpcServerStatus GetStatus();
+    void UpdateNodeValue(string tagname, string? value, DateTime timestamp);
+    void RebuildAddressSpace(IEnumerable<ExperionCrawler.Core.Domain.Entities.RealtimePoint> points);
+}
+
+public record OpcServerStatus(
+    bool Running,
+    int  ConnectedClientCount,
+    int  NodeCount,
+    string EndpointUrl,
+    DateTime? StartedAt);
+
 // ── Status Code ──────────────────────────────────────────────────────────────
 
 public interface IExperionStatusCodeService