fix: 해구 조회 ST_Contains 제거 — 바운딩 박스 조인으로 간소화

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/java/gc/mda/signal_batch/monitoring/controller/MonitoringController.java

@@ -103,18 +103,18 @@ public class MonitoringController {
             JOIN signal.t_ais_position a
                 ON a.lat BETWEEN h.min_lat AND h.max_lat
                 AND a.lon BETWEEN h.min_lon AND h.max_lon
-                AND public.ST_Contains(h.geom, a.geom)
             WHERE a.last_update > NOW() - INTERVAL '30 minutes'
             GROUP BY h.haegu_no, h.min_lat, h.min_lon, h.max_lat, h.max_lon,
-                     h.center_lon, h.center_lat, h.geom
+                     h.center_lon, h.center_lat
             HAVING COUNT(DISTINCT a.mmsi) > 0
             ORDER BY current_vessels DESC
             LIMIT 50
         """;
 
         try {
+            long start = System.currentTimeMillis();
             List<Map<String, Object>> result = queryJdbcTemplate.queryForList(sql);
-            log.info("Haegu realtime query returned {} rows", result.size());
+            log.info("Haegu realtime query: {} rows in {}ms", result.size(), System.currentTimeMillis() - start);
             return result;
         } catch (Exception e) {
             log.error("Failed to get realtime haegu status: {}", e.getMessage(), e);