diff --git a/config/gateway-config.json b/config/gateway-config.json
index 0700fc3..798162f 100644
--- a/config/gateway-config.json
+++ b/config/gateway-config.json
@@ -53,7 +53,7 @@
       "grpcPort": 50055,
       "pollIntervalMs": 1000,
       "registerMapPath": "",
-      "enabled": true
+      "enabled": false
     }
   ]
 }
\ No newline at end of file
diff --git a/src/Infrastructure/Database/Hc900DbContext.cs b/src/Infrastructure/Database/Hc900DbContext.cs
index d2e5a3d..4bc5ae7 100644
--- a/src/Infrastructure/Database/Hc900DbContext.cs
+++ b/src/Infrastructure/Database/Hc900DbContext.cs
@@ -705,7 +705,7 @@ public class Hc900DbService : IExperionDbService
             // realtime_table 생성 (실시간 모니터링 포인트)
             await _ctx.Database.ExecuteSqlRawAsync("""
                 CREATE TABLE IF NOT EXISTS realtime_table (
-                    id            SERIAL PRIMARY KEY,
+                    id            BIGSERIAL PRIMARY KEY,
                     tagname       TEXT        NOT NULL,
                     node_id       TEXT        NOT NULL,
                     livevalue     TEXT,
@@ -772,6 +772,21 @@ public class Hc900DbService : IExperionDbService
                     ON event_history_table(tagname, event_type, event_time DESC);
                 """);
 
+            // ── realtime_table.id int4→bigint 마이그레이션 (멱등) ───────────────
+            // realtime_table은 upsert지만 매 poll마다 nextval을 소비 → SERIAL(int4)은
+            // 2^31에서 오버플로해 전체 업서트가 멈춘다(운영 사고). 이미 bigint면 no-op.
+            await _ctx.Database.ExecuteSqlRawAsync("""
+                DO $$
+                BEGIN
+                  IF (SELECT data_type FROM information_schema.columns
+                      WHERE table_schema = current_schema()
+                        AND table_name = 'realtime_table' AND column_name = 'id') = 'integer' THEN
+                    ALTER TABLE realtime_table ALTER COLUMN id TYPE bigint;
+                    ALTER SEQUENCE realtime_table_id_seq AS bigint MAXVALUE 9223372036854775807;
+                  END IF;
+                END $$;
+                """);
+
             // ── Multi-Controller Migration (controller_id) ─────────────────────
             // 기존 테이블에 controller_id 컬럼 추가 (멱등)
             await _ctx.Database.ExecuteSqlRawAsync(