fix(system): three next-runs, completed-date data_date, running mark

Split /system schedule into fans / snapshot+UP / discovery next-runs.
Drive data_date and snapshot_days from fully completed video snapshots
only, keep prior success date on failure, show task failure records, and
mark in-progress tasks as 运行中 without wall-clock next-run jumps.

tests/test_web_queries.py

@@ -357,10 +357,14 @@ def test_fans_candidates_system_and_export():
             assert system["snapshot_days"] == 3
             assert system["blacklist"][0]["video_count"] == 1
             assert system["tasks"]["snapshot"]["ok"] is True
+            assert system["tasks"]["fans"]["ok"] is True
             assert system["errors"] == []
             assert system["preview"] is False
+            assert system["running"] == {}
+            assert set(system["next_runs"]) >= {"fans", "snapshot", "discover"}
             assert system["next_runs"]["snapshot"] > 0
-            assert system["next_runs"]["discover"] > FIXED_NOW
+            assert system["next_runs"]["fans"] > 0
+            assert system["next_runs"]["discover"] > 0
         finally:
             db.close()
 
@@ -562,8 +566,92 @@ def main_test():
     test_stats_query()
     test_fans_custom_range_modes()
     test_fans_candidates_system_and_export()
+    test_system_status_uses_completed_date_and_running_flags()
+    test_system_next_runs_follow_last_completion_not_wall_clock()
     print("OK: Web 查询层总览/榜单/详情/UP/时长效率/粉丝/候选/系统/访问统计测试全部通过")
 
 
+
+def test_system_status_uses_completed_date_and_running_flags():
+    """采集中途的 ok=1 不得抢跑数据日期；running 显示三任务。"""
+    import json
+
+    with tempfile.TemporaryDirectory() as tmp:
+        db, q = setup(tmp)
+        try:
+            repo = Repository(db)
+            # 模拟今日部分写入成功，但完成日仍停在前一天
+            today = "2026-11-01"
+            repo.upsert_snapshot(
+                today, 101,
+                metrics={"view": 1, "like": 0, "coin": 0, "favorite": 0,
+                         "share": 0, "reply": 0, "danmaku": 0},
+                ok=True, err=None, captured_at=FIXED_NOW,
+            )
+            assert repo.kv_get("snapshot:last_completed") == DATES[-1]
+
+            system = q.system()
+            overview = q.overview()
+            assert system["data_date"] == DATES[-1]
+            assert overview["data_date"] == DATES[-1]
+            assert system["snapshot_days"] == 3
+
+            # 三个下次运行字段；标记 snapshot 运行中
+            repo.kv_set(
+                "task:running:snapshot",
+                json.dumps({"name": "snapshot", "started_at": FIXED_NOW}),
+            )
+            DASHBOARD_CACHE.clear()
+            system = q.system()
+            assert "snapshot" in system["running"]
+            assert system["running"]["snapshot"]["running"] is True
+            assert set(system["next_runs"]) >= {"fans", "snapshot", "discover"}
+
+            # 失败记录保留，完成日不变
+            repo.kv_set(
+                "task:last:snapshot",
+                json.dumps({
+                    "name": "snapshot", "ok": False,
+                    "started_at": FIXED_NOW - 10, "finished_at": FIXED_NOW,
+                    "error": "boom", "summary": None,
+                }),
+            )
+            repo.kv_delete("task:running:snapshot")
+            DASHBOARD_CACHE.clear()
+            system = q.system()
+            assert system["data_date"] == DATES[-1]
+            assert overview["data_date"] == DATES[-1]
+            assert any(err["task"] == "snapshot" for err in system["errors"])
+            assert system["tasks"]["snapshot"]["ok"] is False
+        finally:
+            db.close()
+
+
+def test_system_next_runs_follow_last_completion_not_wall_clock():
+    import json
+
+    with tempfile.TemporaryDirectory() as tmp:
+        db, q = setup(tmp)
+        try:
+            repo = Repository(db)
+            # 发现任务刚完成不久：下次 = finished + 60min，即使 now 已超过也不跳档
+            finished = FIXED_NOW - 30
+            repo.kv_set(
+                "task:last:discovery",
+                json.dumps({
+                    "name": "discovery", "ok": True,
+                    "started_at": finished - 5, "finished_at": finished,
+                    "error": None, "summary": {},
+                }),
+            )
+            DASHBOARD_CACHE.clear()
+            system = q.system()
+            assert system["next_runs"]["discover"] == finished + 3600
+            # 仍小于/等于 now 也可以（表示本轮后的下一档已到期或未到），但绝不能跳到 +7200
+            assert system["next_runs"]["discover"] != finished + 7200
+        finally:
+            db.close()
+
+
 if __name__ == "__main__":
     main_test()