update 22

src/main/java/research/loghunter/service/ScanService.java

@@ -1,5 +1,6 @@
 package research.loghunter.service;
 
+import jakarta.persistence.EntityManager;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -7,6 +8,10 @@ import org.springframework.transaction.annotation.Transactional;
 import research.loghunter.entity.*;
 import research.loghunter.repository.*;
 
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.Statement;
+
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
@@ -32,6 +37,8 @@ public class ScanService {
     private final ScannedFileRepository scannedFileRepository;
     private final SftpService sftpService;
     private final LogParserService logParserService;
+    private final EntityManager entityManager;
+    private final DataSource dataSource;
 
     // 진행 상황 저장 (serverId -> ScanProgress)
     private final ConcurrentHashMap<Long, ScanProgress> progressMap = new ConcurrentHashMap<>();
@@ -241,6 +248,8 @@ public class ScanService {
             return new ScanResult(server.getId(), server.getName(), false, 0, 0, e.getMessage());
         } finally {
             progressMap.remove(server.getId());
+            // DB 최적화 (삭제된 데이터 공간 회수)
+            vacuumDatabase();
         }
     }
 
@@ -400,6 +409,23 @@ public class ScanService {
         }
     }
 
+    /**
+     * SQLite VACUUM 실행 (DB 최적화)
+     * 삭제된 데이터가 차지하는 공간을 회수함
+     */
+    private void vacuumDatabase() {
+        try (Connection conn = dataSource.getConnection();
+             Statement stmt = conn.createStatement()) {
+            log.info("Running VACUUM to optimize database...");
+            long startTime = System.currentTimeMillis();
+            stmt.execute("VACUUM");
+            long elapsed = System.currentTimeMillis() - startTime;
+            log.info("VACUUM completed in {}ms", elapsed);
+        } catch (Exception e) {
+            log.warn("Failed to vacuum database: {}", e.getMessage());
+        }
+    }
+
     // DTOs
     public static class ScanProgress {
         private Long serverId;