알림삭제 기능 추가

backend/src/main/java/com/goldenchart/controller/TradeSignalController.java

@@ -12,8 +12,11 @@ import java.util.List;
  * 매매 시그널 이력 REST API.
  *
  * <pre>
- * GET  /api/trade-signals          → 전체 이력
- * GET  /api/trade-signals?market=  → 종목별 이력
+ * GET    /api/trade-signals              → 전체 이력
+ * GET    /api/trade-signals?market=      → 종목별 이력
+ * DELETE /api/trade-signals/{id}         → 단건 삭제
+ * DELETE /api/trade-signals              → 전체 삭제
+ * POST   /api/trade-signals/delete-batch → ID 목록 삭제
  * </pre>
  */
 @RestController
@@ -36,6 +39,32 @@ public class TradeSignalController {
         return ResponseEntity.ok(result);
     }
 
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> deleteOne(
+            @PathVariable Long id,
+            @RequestHeader(value = "X-User-Id",   required = false) String userIdHeader,
+            @RequestHeader(value = "X-Device-Id", required = false) String deviceId) {
+        service.deleteOne(id, parseUserId(userIdHeader), deviceId);
+        return ResponseEntity.noContent().build();
+    }
+
+    @DeleteMapping
+    public ResponseEntity<java.util.Map<String, Integer>> deleteAll(
+            @RequestHeader(value = "X-User-Id",   required = false) String userIdHeader,
+            @RequestHeader(value = "X-Device-Id", required = false) String deviceId) {
+        int deleted = service.deleteAll(parseUserId(userIdHeader), deviceId);
+        return ResponseEntity.ok(java.util.Map.of("deleted", deleted));
+    }
+
+    @PostMapping("/delete-batch")
+    public ResponseEntity<java.util.Map<String, Integer>> deleteBatch(
+            @RequestBody java.util.List<Long> ids,
+            @RequestHeader(value = "X-User-Id",   required = false) String userIdHeader,
+            @RequestHeader(value = "X-Device-Id", required = false) String deviceId) {
+        int deleted = service.deleteBatch(ids, parseUserId(userIdHeader), deviceId);
+        return ResponseEntity.ok(java.util.Map.of("deleted", deleted));
+    }
+
     private Long parseUserId(String h) {
         if (h == null || h.isBlank()) return null;
         try { return Long.parseLong(h); } catch (NumberFormatException e) { return null; }

backend/src/main/java/com/goldenchart/repository/GcTradeSignalRepository.java

@@ -2,6 +2,9 @@ package com.goldenchart.repository;
 
 import com.goldenchart.entity.GcTradeSignal;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 import java.util.List;
 
@@ -10,4 +13,13 @@ public interface GcTradeSignalRepository extends JpaRepository<GcTradeSignal, Lo
     List<GcTradeSignal> findByDeviceIdOrderByCreatedAtDesc(String deviceId);
     List<GcTradeSignal> findByUserIdOrderByCreatedAtDesc(Long userId);
     List<GcTradeSignal> findByDeviceIdAndMarketOrderByCreatedAtDesc(String deviceId, String market);
+
+    @Modifying
+    @Query("DELETE FROM GcTradeSignal e WHERE e.userId = :userId")
+    void deleteByUserId(@Param("userId") Long userId);
+
+    @Modifying
+    @Query("DELETE FROM GcTradeSignal e WHERE e.deviceId = :deviceId AND (e.userId IS NULL OR e.userId = 0)")
+    void deleteByDeviceId(@Param("deviceId") String deviceId);
+
 }

backend/src/main/java/com/goldenchart/service/TradeSignalService.java

@@ -69,6 +69,52 @@ public class TradeSignalService {
                 .stream().map(this::toDto).toList();
     }
 
+    // ── 삭제 ─────────────────────────────────────────────────────────────────
+
+    public void deleteOne(Long id, Long userId, String deviceId) {
+        if (id == null) return;
+        repo.findById(id).ifPresent(entity -> {
+            if (!owns(entity, userId, deviceId)) return;
+            repo.delete(entity);
+            log.info("[TradeSignal] deleted id={} market={}", id, entity.getMarket());
+        });
+    }
+
+    public int deleteBatch(List<Long> ids, Long userId, String deviceId) {
+        if (ids == null || ids.isEmpty()) return 0;
+        List<GcTradeSignal> toDelete = ids.stream()
+                .distinct()
+                .map(repo::findById)
+                .filter(java.util.Optional::isPresent)
+                .map(java.util.Optional::get)
+                .filter(e -> owns(e, userId, deviceId))
+                .toList();
+        if (toDelete.isEmpty()) return 0;
+        repo.deleteAll(toDelete);
+        log.info("[TradeSignal] batch deleted count={}", toDelete.size());
+        return toDelete.size();
+    }
+
+    public int deleteAll(Long userId, String deviceId) {
+        if (userId != null) {
+            long count = repo.findByUserIdOrderByCreatedAtDesc(userId).size();
+            repo.deleteByUserId(userId);
+            log.info("[TradeSignal] deleted all for userId={} count≈{}", userId, count);
+            return (int) count;
+        }
+        String dev = deviceId != null ? deviceId : "";
+        long count = repo.findByDeviceIdOrderByCreatedAtDesc(dev).size();
+        repo.deleteByDeviceId(dev);
+        log.info("[TradeSignal] deleted all for deviceId={} count≈{}", dev, count);
+        return (int) count;
+    }
+
+    private static boolean owns(GcTradeSignal entity, Long userId, String deviceId) {
+        if (userId != null && userId.equals(entity.getUserId())) return true;
+        if (deviceId == null || deviceId.isBlank()) return false;
+        return deviceId.equals(entity.getDeviceId());
+    }
+
     // ── 변환 ─────────────────────────────────────────────────────────────────
 
     private TradeSignalDto toDto(GcTradeSignal e) {