fix(scheduler): daily slot off-plan + cross-midnight resume (#8)

- Cross-midnight: unfinished yesterday seals ASAP with yesterday's stat_date;
  force seal ignores today's snapshot_at gate when stat_date < today.
- Off-plan already_completed: compare completion started_at (not finished_at)
  to today's planned slot; earlier → still run at slot for all daily tasks.
- Cold start: bootstrap task:state from task:last / seed markers.
- ensure_pending: do not glue new due onto a different day's unfinished state.
- run_if_needed(force): keep_scraped True for seal, False for CLI --force.
- Scheduler due_reader: pick up disk due_at each loop (seed→evening seal).

tests/test_snapshot.py

@@ -705,6 +705,73 @@ def test_seal_keep_scraped_skips_view_progress_punches_seed():
             db.close()
 
 
+
+def test_force_keep_scraped_false_rescrapes_view_progress():
+    """C: CLI --force 路径 keep_scraped=False 须重采已有 view 进度行。"""
+    clock = 1_800_000_000
+    with tempfile.TemporaryDirectory() as tmp:
+        transport = SnapshotTransport({
+            1: view_for(1, view=999),
+            2: view_for(2, view=222),
+        })
+        db, repo, service = make_service(tmp, transport)
+        try:
+            add_video(repo, 1)
+            add_video(repo, 2)
+            today = DATE
+            for aid, view, src in ((1, 111, "view"), (2, 20, "seed")):
+                repo.upsert_snapshot(
+                    today, aid,
+                    metrics={"view": view, "like": 1, "coin": 0, "favorite": 0,
+                             "share": 0, "reply": 0, "danmaku": 0},
+                    ok=True, err=None, captured_at=clock, src=src,
+                )
+            repo.kv_set(service.seeded_key(today), "1")
+            forced = service.run_if_needed(
+                date=today, force=True, keep_scraped=False,
+            )
+            assert forced.completed is True
+            # 两条都重采
+            assert transport.count("/web-interface/view") == 2
+            assert int(repo.get_snapshot(today, 1)["view"]) == 999
+        finally:
+            db.close()
+
+
+def test_force_default_keep_scraped_skips_view_progress():
+    """C: force 默认 keep_scraped=True（seal）跳过已 view 行。"""
+    clock = 1_800_000_000
+    with tempfile.TemporaryDirectory() as tmp:
+        transport = SnapshotTransport({
+            1: view_for(1, view=999),
+            2: view_for(2, view=222),
+        })
+        db, repo, service = make_service(tmp, transport)
+        try:
+            add_video(repo, 1)
+            add_video(repo, 2)
+            today = DATE
+            repo.upsert_snapshot(
+                today, 1,
+                metrics={"view": 111, "like": 1, "coin": 0, "favorite": 0,
+                         "share": 0, "reply": 0, "danmaku": 0},
+                ok=True, err=None, captured_at=clock, src="view",
+            )
+            repo.upsert_snapshot(
+                today, 2,
+                metrics={"view": 20, "like": 1, "coin": 0, "favorite": 0,
+                         "share": 0, "reply": 0, "danmaku": 0},
+                ok=True, err=None, captured_at=clock, src="seed",
+            )
+            repo.kv_set(service.seeded_key(today), "1")
+            sealed = service.run_if_needed(date=today, force=True)
+            assert sealed.completed is True
+            assert transport.count("/web-interface/view") == 1
+            assert int(repo.get_snapshot(today, 1)["view"]) == 111
+        finally:
+            db.close()
+
+
 def main():
     test_snapshot_success_resume_and_force()
     test_resume_skips_ok_and_retries_failed()
@@ -724,6 +791,8 @@ def main():
     test_seed_from_last_completed_does_not_mark_completed()
     test_seeded_day_skips_without_force_and_seals_with_force()
     test_seal_keep_scraped_skips_view_progress_punches_seed()
+    test_force_keep_scraped_false_rescrapes_view_progress()
+    test_force_default_keep_scraped_skips_view_progress()
     print("OK: 每日快照、断点续跑、失败占位与粉丝采集测试全部通过")