perf: 优化日志保留与分页查询

- 降低普通只读请求的日志写入并保留敏感 GET 审计

- 增加数据库分批清理、时间索引和文件滚动容量上限

- 增加近 30 天筛选、稳定倒序和分页大小限制

easyflow-modules/easyflow-module-system/src/test/java/tech/easyflow/system/schedule/SysLogCleanupJobTest.java

@@ -0,0 +1,67 @@
+package tech.easyflow.system.schedule;
+
+import org.junit.Test;
+import tech.easyflow.log.LogRecordProperties;
+import tech.easyflow.system.mapper.SysLogMapper;
+
+import java.util.Date;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * {@link SysLogCleanupJob} 分批清理行为测试。
+ */
+public class SysLogCleanupJobTest {
+
+    /**
+     * 验证清理任务在最后一个不满批次后停止。
+     */
+    @Test
+    public void cleanupShouldStopAfterPartialBatch() {
+        SysLogMapper mapper = mock(SysLogMapper.class);
+        LogRecordProperties properties = properties(5_000, 10);
+        Date cutoff = new Date();
+        when(mapper.deleteExpiredBatch(cutoff, 5_000))
+                .thenReturn(5_000)
+                .thenReturn(1_200);
+
+        SysLogCleanupJob job = new SysLogCleanupJob(mapper, properties);
+
+        assertEquals(6_200, job.cleanupExpired(cutoff));
+        verify(mapper, times(2)).deleteExpiredBatch(cutoff, 5_000);
+    }
+
+    /**
+     * 验证清理任务遵守单次调度最大批次数。
+     */
+    @Test
+    public void cleanupShouldRespectMaxBatches() {
+        SysLogMapper mapper = mock(SysLogMapper.class);
+        LogRecordProperties properties = properties(2_000, 3);
+        Date cutoff = new Date();
+        when(mapper.deleteExpiredBatch(cutoff, 2_000)).thenReturn(2_000);
+
+        SysLogCleanupJob job = new SysLogCleanupJob(mapper, properties);
+
+        assertEquals(6_000, job.cleanupExpired(cutoff));
+        verify(mapper, times(3)).deleteExpiredBatch(cutoff, 2_000);
+    }
+
+    /**
+     * 创建测试日志配置。
+     *
+     * @param batchSize 单批行数
+     * @param maxBatches 最大批次数
+     * @return 日志配置
+     */
+    private LogRecordProperties properties(int batchSize, int maxBatches) {
+        LogRecordProperties properties = new LogRecordProperties();
+        properties.getRetention().setBatchSize(batchSize);
+        properties.getRetention().setMaxBatches(maxBatches);
+        return properties;
+    }
+}