修复WAL模式下丢失数据问题

springboot-backend/src/main/java/com/admin/config/SQLiteConfig.java

@@ -3,8 +3,11 @@ package com.admin.config;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.boot.ApplicationArguments;
 import org.springframework.boot.ApplicationRunner;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
+import javax.annotation.PreDestroy;
 import javax.sql.DataSource;
 import java.sql.Connection;
 import java.sql.Statement;
@@ -12,9 +15,11 @@ import java.sql.Statement;
 /**
  * SQLite 数据库配置
  * 启用 WAL (Write-Ahead Logging) 模式以提高并发性能
+ * 添加定期 checkpoint 和优雅关闭处理
  */
 @Slf4j
 @Component
+@EnableScheduling
 public class SQLiteConfig implements ApplicationRunner {
 
     private final DataSource dataSource;
@@ -33,10 +38,46 @@ public class SQLiteConfig implements ApplicationRunner {
             statement.execute("PRAGMA cache_size=-64000;"); // 64MB 缓存
             statement.execute("PRAGMA temp_store=MEMORY;");
             statement.execute("PRAGMA busy_timeout=5000;"); // 5秒超时
+            statement.execute("PRAGMA wal_autocheckpoint=1000;"); // 每1000页自动checkpoint
+            
+            log.info("SQLite WAL mode configured successfully");
         } catch (Exception e) {
             log.error("Failed to configure SQLite database", e);
             throw e;
         }
     }
+    
+    /**
+     * 定期执行 checkpoint，确保 WAL 文件内容写入主数据库
+     * 每5分钟执行一次
+     */
+    @Scheduled(fixedDelay = 300000, initialDelay = 300000)
+    public void performCheckpoint() {
+        try (Connection connection = dataSource.getConnection();
+             Statement statement = connection.createStatement()) {
+            
+            statement.execute("PRAGMA wal_checkpoint(TRUNCATE);");
+            log.debug("SQLite WAL checkpoint completed");
+        } catch (Exception e) {
+            log.error("Failed to perform SQLite checkpoint", e);
+        }
+    }
+    
+    /**
+     * 应用关闭前执行最终的 checkpoint，确保所有数据都写入主数据库文件
+     */
+    @PreDestroy
+    public void onShutdown() {
+        log.info("Performing final SQLite checkpoint before shutdown...");
+        try (Connection connection = dataSource.getConnection();
+             Statement statement = connection.createStatement()) {
+            
+            // 强制执行 checkpoint，将所有 WAL 内容写入主数据库
+            statement.execute("PRAGMA wal_checkpoint(TRUNCATE);");
+            log.info("Final SQLite checkpoint completed successfully");
+        } catch (Exception e) {
+            log.error("Failed to perform final SQLite checkpoint", e);
+        }
+    }
 }