test: 日终价格回归测试（日期窗口纯单测 + 新增可见性DB集成测试）

- EodPriceService 提取 static ResolveValueDateWindow(reqStart,reqEnd)，使日期窗口逻辑可脱离数据库单测

- EodPriceDtoTest 新增4个纯单测：未传日期回退±1年、起止都填今天→仅今天窗口、显式区间原样生效、结束日今天上界为明天；锁定'页面始终5条'根因

- EodPriceGoldenReplayTest 新增 Record_NewRecordVisibility([Ignore]手动跑)：直接跑 SearchUnderlyingList，锁定(a)今天+已上市可查 (b)日期0001查不出 (c)未上市查不出

- 构建0错误；EodPriceDtoTest 19通过0失败

UnitTestProject/Modules/EodModule/EodPriceDtoTest.cs

@@ -202,5 +202,53 @@ namespace YLErp.Modules.EodModule
         }
 
         #endregion
+
+        #region 日期窗口解析（"页面始终5条"根因锁定，纯单测不连库）
+
+        [TestMethod]
+        [Description("前端未传日期(年份<=2000) → 回退到 [今天-1年, 今天+1年)")]
+        public void 未传日期_回退最近一年到明年()
+        {
+            var (start, end) = EodPriceService.ResolveValueDateWindow(DateTime.MinValue, DateTime.MinValue);
+            Assert.AreEqual(DateTime.Today.AddYears(-1).Date, start.Date, "起始应回退到今天-1年");
+            Assert.AreEqual(DateTime.Today.AddYears(1).Date, end.Date, "结束应回退到今天+1年");
+            Assert.IsTrue(end > start, "窗口应正向");
+        }
+
+        [TestMethod]
+        [Description("列表页默认起止都填今天 → 窗口=[今天, 今天+1天)，仅返回当天记录（即'5条'现象成因）")]
+        public void 起止都填今天_窗口仅今天()
+        {
+            var today = DateTime.Today;
+            var (start, end) = EodPriceService.ResolveValueDateWindow(today, today);
+            Assert.AreEqual(today.Date, start.Date, "起始应为今天");
+            Assert.AreEqual(today.AddDays(1).Date, end.Date, "结束应为今天+1天（半开区间含今天）");
+            Assert.IsTrue(today >= start && today < end, "今天的记录应落入窗口");
+            Assert.IsFalse(today.AddDays(-1) >= start && today.AddDays(-1) < end, "昨天的记录不应落入仅今天窗口");
+            Assert.IsFalse(today.AddDays(1) >= start && today.AddDays(1) < end, "明天的记录不应落入仅今天窗口");
+        }
+
+        [TestMethod]
+        [Description("显式传区间(如近30天) → 原样生效，不被回退覆盖")]
+        public void 显式区间_原样生效()
+        {
+            var start0 = DateTime.Today.AddDays(-30);
+            var end0 = DateTime.Today;
+            var (start, end) = EodPriceService.ResolveValueDateWindow(start0, end0);
+            Assert.AreEqual(start0.Date, start.Date, "起始应等于传入");
+            Assert.AreEqual(end0.AddDays(1).Date, end.Date, "结束应等于传入+1天");
+        }
+
+        [TestMethod]
+        [Description("结束日=今天 → 半开区间上界=今天+1天，今天当天记录可命中")]
+        public void 结束日今天_上界为明天_当天可命中()
+        {
+            var (start, end) = EodPriceService.ResolveValueDateWindow(DateTime.Today.AddDays(-365), DateTime.Today);
+            var today = DateTime.Today;
+            Assert.IsTrue(today >= start && today < end, "今天记录应命中");
+            Assert.IsFalse(today.AddDays(1) >= start && today.AddDays(1) < end, "明天记录不应命中");
+        }
+
+        #endregion
     }
 }