Merge pull request 'fix: parent_resolution JOIN 타이밍 갭 허용' (#226) from hotfix/join-timing-tolerance into main

5분 사이클에서 폴리곤 저장 → inference 실행 순서로 인해
latest snapshot_time > last_evaluated_at이 될 수 있음.
JOIN 조건에 10분 여유를 두어 이전 사이클 결과도 매칭되도록 수정.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/src/main/java/gc/mda/kcg/domain/fleet/GroupPolygonService.java

@@ -51,7 +51,7 @@ public class GroupPolygonService {
                 JOIN latest_groups lg
                   ON lg.group_key = c.group_key
                  AND lg.sub_cluster_id = c.sub_cluster_id
-                 AND c.observed_at >= lg.snapshot_time
+                 AND c.observed_at >= lg.snapshot_time - INTERVAL '10 minutes'
                 GROUP BY c.group_key, c.sub_cluster_id
             ),
             candidate_counts AS (
@@ -79,7 +79,7 @@ public class GroupPolygonService {
             LEFT JOIN %s r
               ON r.group_key = lg.group_key
              AND r.sub_cluster_id = lg.sub_cluster_id
-             AND r.last_evaluated_at >= lg.snapshot_time
+             AND r.last_evaluated_at >= lg.snapshot_time - INTERVAL '10 minutes'
             LEFT JOIN candidate_counts cc
               ON cc.group_key = lg.group_key
              AND cc.sub_cluster_id = lg.sub_cluster_id
@@ -105,7 +105,7 @@ public class GroupPolygonService {
             LEFT JOIN %s r
               ON r.group_key = g.group_key
              AND r.sub_cluster_id = g.sub_cluster_id
-             AND r.last_evaluated_at >= g.snapshot_time
+             AND r.last_evaluated_at >= g.snapshot_time - INTERVAL '10 minutes'
             WHERE g.group_key = ?
             ORDER BY g.snapshot_time DESC
             LIMIT 1
@@ -130,7 +130,7 @@ public class GroupPolygonService {
             LEFT JOIN %s r
               ON r.group_key = g.group_key
              AND r.sub_cluster_id = g.sub_cluster_id
-             AND r.last_evaluated_at >= g.snapshot_time
+             AND r.last_evaluated_at >= g.snapshot_time - INTERVAL '10 minutes'
             WHERE g.group_key = ? AND g.snapshot_time > NOW() - CAST(? || ' hours' AS INTERVAL)
             ORDER BY g.snapshot_time DESC
             """;
@@ -186,7 +186,7 @@ public class GroupPolygonService {
                 JOIN latest_groups lg
                   ON lg.group_key = c.group_key
                  AND lg.sub_cluster_id = c.sub_cluster_id
-                 AND c.observed_at >= lg.snapshot_time
+                 AND c.observed_at >= lg.snapshot_time - INTERVAL '10 minutes'
                 GROUP BY c.group_key, c.sub_cluster_id
             ),
             candidate_counts AS (
@@ -215,7 +215,7 @@ public class GroupPolygonService {
             JOIN %s r
               ON r.group_key = lg.group_key
              AND r.sub_cluster_id = lg.sub_cluster_id
-             AND r.last_evaluated_at >= lg.snapshot_time
+             AND r.last_evaluated_at >= lg.snapshot_time - INTERVAL '10 minutes'
             LEFT JOIN candidate_counts cc
               ON cc.group_key = lg.group_key
              AND cc.sub_cluster_id = lg.sub_cluster_id
@@ -247,7 +247,7 @@ public class GroupPolygonService {
                 JOIN latest_groups lg
                   ON lg.group_key = c.group_key
                  AND lg.sub_cluster_id = c.sub_cluster_id
-                 AND c.observed_at >= lg.snapshot_time
+                 AND c.observed_at >= lg.snapshot_time - INTERVAL '10 minutes'
                 WHERE c.group_key = ?
                 GROUP BY c.group_key, c.sub_cluster_id
             ),
@@ -277,7 +277,7 @@ public class GroupPolygonService {
             LEFT JOIN %s r
               ON r.group_key = lg.group_key
              AND r.sub_cluster_id = lg.sub_cluster_id
-             AND r.last_evaluated_at >= lg.snapshot_time
+             AND r.last_evaluated_at >= lg.snapshot_time - INTERVAL '10 minutes'
             LEFT JOIN candidate_counts cc
               ON cc.group_key = lg.group_key
              AND cc.sub_cluster_id = lg.sub_cluster_id
@@ -301,7 +301,7 @@ public class GroupPolygonService {
                 JOIN latest_groups lg
                   ON lg.group_key = c.group_key
                  AND lg.sub_cluster_id = c.sub_cluster_id
-                 AND c.observed_at >= lg.snapshot_time
+                 AND c.observed_at >= lg.snapshot_time - INTERVAL '10 minutes'
                 GROUP BY c.group_key, c.sub_cluster_id
             )
             SELECT c.group_key, c.sub_cluster_id, c.candidate_mmsi, c.candidate_name,