feat: carry overdue interval habits forward

backend/mvp.py

@@ -938,7 +938,14 @@ def require_active_habit(habit):
 
 
 async def require_positive_log_day(db, habit, day):
-    if not scheduled(habit, day):
+    completed_days = []
+    if habit.schedule_type == "interval":
+        completed_days = list((await db.scalars(select(HabitLog.day).where(
+            HabitLog.habit_id == habit.id,
+            HabitLog.day < day,
+            HabitLog.value >= habit.target,
+        ).order_by(HabitLog.day))).all())
+    if not scheduled(habit, day, completed_days):
         raise HTTPException(409, "非计划日不可记录正向进度")
     paused = await db.scalar(select(HabitPause.id).where(
         HabitPause.habit_id == habit.id,
@@ -1128,12 +1135,20 @@ async def pause_habit(habit_id: UUID, payload: PauseInput, user: User = Depends(
     row = HabitPause(habit_id=habit.id, **payload.model_dump()); db.add(row); await db.commit(); await db.refresh(row); return {"id": row.id, **payload.model_dump()}
 
 
-def scheduled(h, day):
+def scheduled(h, day, completed_days=None):
     if day < h.start_date: return False
     if h.schedule_type == "daily": return True
     if h.schedule_type == "weekly": return day.weekday() in {int(x) for x in (h.weekdays or "").split(",") if x}
     if h.schedule_type == "monthly": return day.day in {int(x) for x in (h.month_days or "").split(",") if x}
-    return (day - h.start_date).days % h.interval_days == 0
+    completed_days = [
+        completed_day
+        for completed_day in (completed_days or [])
+        if h.start_date <= completed_day < day
+    ]
+    last_completed = max(completed_days, default=None)
+    base = last_completed if last_completed is not None else h.start_date
+    next_due = base + timedelta(days=h.interval_days) if last_completed is not None else h.start_date
+    return day >= next_due
 
 
 @router.get("/habits/grid")
@@ -1150,6 +1165,7 @@ async def habits_grid(week: date, user: User = Depends(current_user), db: AsyncS
             func.sum(HabitLog.value),
             func.count(HabitLog.id),
             func.sum(case((HabitLog.value >= Habit.target, 1), else_=0)),
+            func.max(case((HabitLog.value >= Habit.target, HabitLog.day), else_=None)).filter(HabitLog.day < days[0]),
         )
         .join(Habit, Habit.id == HabitLog.habit_id)
         .where(HabitLog.habit_id.in_(habit_ids))
@@ -1159,18 +1175,26 @@ async def habits_grid(week: date, user: User = Depends(current_user), db: AsyncS
     logs_by_habit = {}
     stats_by_habit = {}
     pauses_by_habit = {}
+    completed_days_by_habit = {}
+    habits_by_id = {habit.id: habit for habit in habits}
+    for habit_id, total, logged_days, completed_days, previous_completed in stats_rows:
+        stats_by_habit[habit_id] = {"total": total or 0, "completed_days": completed_days or 0, "logged_days": logged_days or 0}
+        if previous_completed is not None:
+            completed_days_by_habit[habit_id] = [previous_completed]
     for log in week_logs:
         logs_by_habit.setdefault(log.habit_id, {})[log.day] = log.value
-    for habit_id, total, logged_days, completed_days in stats_rows:
+        habit = habits_by_id.get(log.habit_id)
-        stats_by_habit[habit_id] = {"total": total or 0, "completed_days": completed_days or 0, "logged_days": logged_days or 0}
+        if habit is not None and habit.schedule_type == "interval" and log.value >= habit.target:
+            completed_days_by_habit.setdefault(log.habit_id, []).append(log.day)
     for pause in pause_rows:
         pauses_by_habit.setdefault(pause.habit_id, []).append(pause)
     output = []
     for habit in habits:
         logs = logs_by_habit.get(habit.id, {})
         pauses = pauses_by_habit.get(habit.id, [])
+        completed_days = completed_days_by_habit.get(habit.id, []) if habit.schedule_type == "interval" else []
         data = habit_dict(habit)
-        data["cells"] = [{"day": day, "scheduled": scheduled(habit, day), "paused": any(pause.start_date <= day <= pause.end_date for pause in pauses), "value": logs.get(day, 0)} for day in days]
+        data["cells"] = [{"day": day, "scheduled": scheduled(habit, day, completed_days), "paused": any(pause.start_date <= day <= pause.end_date for pause in pauses), "value": logs.get(day, 0)} for day in days]
         data["stats"] = stats_by_habit.get(habit.id, {"total": 0, "completed_days": 0, "logged_days": 0})
         output.append(data)
     return {"days": days, "habits": output}

tests/test_mvp_backend.py

@@ -443,12 +443,62 @@ def test_boolean_interval_habit_schedule(client):
     boot(client)
     habit = client.post(
         "/api/v1/habits",
-        json={"name": "拉伸", "kind": "boolean", "schedule_type": "interval", "interval_days": 2},
+        json={
+            "name": "拉伸",
+            "kind": "boolean",
+            "schedule_type": "interval",
+            "interval_days": 3,
+            "start_date": "2026-09-01",
+        },
     )
     assert habit.status_code == 201
-    assert client.post(
+    habit_id = habit.json()["id"]
-        f"/api/v1/habits/{habit.json()['id']}/logs", json={"day": local_today().isoformat(), "value": 1}
+
-    ).json()["value"] == 1
+    overdue_grid = client.get("/api/v1/habits/grid", params={"week": "2026-09-07"}).json()
+    overdue_cells = {cell["day"]: cell for cell in overdue_grid["habits"][0]["cells"]}
+    assert overdue_cells["2026-09-07"]["scheduled"] is True
+    assert overdue_cells["2026-09-08"]["scheduled"] is True
+    assert overdue_cells["2026-09-09"]["scheduled"] is True
+
+    completed = client.post(
+        f"/api/v1/habits/{habit_id}/logs", json={"day": "2026-09-09", "value": 1}
+    )
+    assert completed.status_code == 200
+
+    next_grid = client.get("/api/v1/habits/grid", params={"week": "2026-09-07"}).json()
+    next_cells = {cell["day"]: cell for cell in next_grid["habits"][0]["cells"]}
+    assert next_cells["2026-09-09"]["scheduled"] is True
+    assert next_cells["2026-09-10"]["scheduled"] is False
+    assert next_cells["2026-09-11"]["scheduled"] is False
+    assert next_cells["2026-09-12"]["scheduled"] is True
+    assert next_cells["2026-09-13"]["scheduled"] is True
+
+
+def test_interval_habit_partial_progress_does_not_restart_interval(client):
+    boot(client)
+    habit = client.post(
+        "/api/v1/habits",
+        json={
+            "name": "喝水",
+            "kind": "numeric",
+            "target": 3,
+            "schedule_type": "interval",
+            "interval_days": 3,
+            "start_date": "2026-09-01",
+        },
+    ).json()
+
+    assert client.put(f"/api/v1/habits/{habit['id']}/logs/2026-09-04", json={"value": 2}).status_code == 200
+    grid = client.get("/api/v1/habits/grid", params={"week": "2026-09-07"}).json()
+    cells = {cell["day"]: cell for cell in grid["habits"][0]["cells"]}
+    assert cells["2026-09-07"]["scheduled"] is True
+
+    assert client.put(f"/api/v1/habits/{habit['id']}/logs/2026-09-08", json={"value": 3}).status_code == 200
+    grid = client.get("/api/v1/habits/grid", params={"week": "2026-09-07"}).json()
+    cells = {cell["day"]: cell for cell in grid["habits"][0]["cells"]}
+    assert cells["2026-09-09"]["scheduled"] is False
+    assert cells["2026-09-10"]["scheduled"] is False
+    assert cells["2026-09-11"]["scheduled"] is True
 
 
 def test_attachment_security_ownership_and_size(client, tmp_path, monkeypatch):