fix(sports): stop the idle back-off sleeping through a kickoff (#599)

* fix(sports): stop the idle back-off sleeping through a kickoff

A league with no live games backs its poll off as empty checks mount,
capped by live_idle_max_interval. The escalation counts empty looks and
nothing else, so a league three hours before kickoff is indistinguishable
from one three months out of season. Both reach the ceiling -- and the
ceiling then *is* the blind spot.

Measured on two rigs on 2026-09-19: gaps of up to 928s between looks, ten
of them at or above 900s. Reproduced in the wild on 2026-09-20, where an
unpatched rig sat for fifteen minutes with eight NFL games in progress and
had not noticed any of them. That is the "it doesn't pick up new live
games until I restart it" report -- restarting being the one thing that
forces an immediate look.

The clamp costs no extra request: the live fetch already downloads the
whole day's scoreboard, upcoming games included, so the earliest start
still ahead of us falls out of the payload the manager already has.
Before a kickoff the wait is shortened so it cannot run past it; just
after one, the live cadence is held for _KICKOFF_GRACE_SECONDS, because a
provider that has not yet flipped the status would otherwise look like
another empty check and escalate the back-off again, right when the game
is starting.

The grace window needed a second pass. A soak caught it as dead code: the
just-passed kickoff was replaced by the next fixture on the card the
instant it passed, `now < start` went true again, and the back-off
returned to its ceiling. Observed live -- the rig polled at 13:00:45,
found nothing because ESPN had not flipped the status, then went quiet for
a quarter of an hour. A kickoff inside the grace window is now kept.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014RRtqXDCnvnY6EQwhT5CV9

* test(sports): pin absolute tolerances and correct a wrong grace expectation

pytest.approx defaults to a relative tolerance. On a unix timestamp that is
roughly 1790 seconds, so every kickoff assertion here was effectively
vacuous -- it called a kickoff half an hour away "equal". All seven now
pin abs=1.

That hid a wrong expectation. test_an_earlier_kickoff_still_wins_during_the_grace
asserted a game ten minutes out should displace one that kicked off moments
ago. It should not, and the code does not: while the grace holds, the wait
is the live cadence (30s), which is strictly tighter than clamping to the
nearer kickoff would give (~600s). Letting the candidate win would set a
ten-minute wait at the exact moment games are starting -- the dead grace
window this branch exists to fix.

The test now pins the real behaviour plus the safety property that makes it
correct, and is renamed to say what it checks.

Reported by CodeRabbit on the PR. The finding was right that code and test
disagreed; the suggested fix was the wrong way to resolve it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014RRtqXDCnvnY6EQwhT5CV9

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

test/test_sports_shared.py

@@ -21,8 +21,10 @@ and by 176 byte-identical safety-harness renders. What is genuinely new is:
 import ast
 import os
 import sys
+import time
 import types
 from abc import ABC
+from datetime import datetime, timedelta, timezone
 
 import pytest
 
@@ -305,6 +307,164 @@ class TestLiveMixin:
         h._empty_live_streak = 24
         assert h._idle_live_interval() == 900
 
+    # ---- the back-off must not sleep through a kickoff -------------------
+    #
+    # The escalation counts empty looks and nothing else, so an in-season
+    # league a few hours before kickoff looks identical to one months out of
+    # season. Both reach the ceiling, and the ceiling then becomes the blind
+    # spot. Measured on two rigs on 2026-09-19: gaps of up to 928s between
+    # looks, ten of them at or above 900s. That is the "it doesn't pick up new
+    # live games until I restart it" report -- restarting being the one thing
+    # that forces an immediate look.
+
+    def _idle_host(self, streak=24, no_data_interval=300, ceiling=900):
+        h = _LiveHost(no_data_interval=no_data_interval)
+        h.live_idle_max_interval = ceiling
+        h.update_interval = 30
+        h._empty_live_streak = streak
+        return h
+
+    def test_without_a_known_kickoff_the_escalation_is_unchanged(self):
+        h = self._idle_host()
+        assert h._idle_live_interval() == 900
+
+    def test_the_wait_never_runs_past_a_known_kickoff(self):
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() + 120
+        # 900s would sleep straight through a kickoff 2 minutes out.
+        assert 30 <= h._idle_live_interval() <= 120
+
+    def test_a_distant_kickoff_does_not_shorten_the_wait(self):
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() + 6 * 3600
+        assert h._idle_live_interval() == 900
+
+    def test_the_wait_never_drops_below_the_live_cadence(self):
+        # A kickoff one second away must not turn into a one-second poll.
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() + 1
+        assert h._idle_live_interval() == h.update_interval
+
+    def test_just_after_kickoff_it_holds_the_live_cadence(self):
+        # ESPN does not flip a game to in-progress exactly at kickoff, and
+        # each early look would otherwise escalate the back-off further,
+        # precisely when the game is starting.
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() - 60
+        assert h._idle_live_interval() == h.update_interval
+
+    def test_long_after_a_kickoff_the_escalation_returns(self):
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() - (sports_shared._KICKOFF_GRACE_SECONDS + 60)
+        assert h._idle_live_interval() == 900
+
+    def test_a_pending_game_is_recorded_as_the_next_kickoff(self):
+        h = self._idle_host()
+        soon = datetime.now(timezone.utc) + timedelta(minutes=20)
+        h._note_scheduled_start_candidate({"is_live": False, "start_time_utc": soon})
+        assert h._next_scheduled_start_ts == pytest.approx(soon.timestamp(), abs=1)
+
+    def test_the_earliest_pending_game_wins(self):
+        h = self._idle_host()
+        later = datetime.now(timezone.utc) + timedelta(hours=4)
+        sooner = datetime.now(timezone.utc) + timedelta(minutes=30)
+        h._note_scheduled_start_candidate({"start_time_utc": later})
+        h._note_scheduled_start_candidate({"start_time_utc": sooner})
+        assert h._next_scheduled_start_ts == pytest.approx(sooner.timestamp(), abs=1)
+        # ... and a later one does not push the stored kickoff back out.
+        h._note_scheduled_start_candidate({"start_time_utc": later})
+        assert h._next_scheduled_start_ts == pytest.approx(sooner.timestamp(), abs=1)
+
+    def test_a_live_game_is_not_a_kickoff_to_wait_for(self):
+        h = self._idle_host()
+        start = datetime.now(timezone.utc) + timedelta(minutes=5)
+        h._note_scheduled_start_candidate({"is_live": True, "start_time_utc": start})
+        h._note_scheduled_start_candidate({"is_halftime": True, "start_time_utc": start})
+        assert getattr(h, "_next_scheduled_start_ts", None) is None
+
+    def test_a_start_already_past_is_not_recorded(self):
+        h = self._idle_host()
+        gone = datetime.now(timezone.utc) - timedelta(minutes=5)
+        h._note_scheduled_start_candidate({"start_time_utc": gone})
+        assert getattr(h, "_next_scheduled_start_ts", None) is None
+
+    def test_a_stored_kickoff_that_passed_is_replaced_not_pinned(self):
+        # A postponed game must not hold the cadence to a kickoff that never
+        # happens; the next candidate offered replaces it.
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() - 10_000
+        later = datetime.now(timezone.utc) + timedelta(hours=3)
+        h._note_scheduled_start_candidate({"start_time_utc": later})
+        assert h._next_scheduled_start_ts == pytest.approx(later.timestamp(), abs=1)
+
+    def test_junk_candidates_are_ignored_rather_than_raising(self):
+        h = self._idle_host()
+        for junk in (None, "not-a-dict", 42, {}, {"start_time_utc": None},
+                     {"start_time_utc": "2026-09-20T13:00Z"},
+                     {"start_time_utc": object()}):
+            h._note_scheduled_start_candidate(junk)
+        assert getattr(h, "_next_scheduled_start_ts", None) is None
+
+    def test_a_host_without_update_interval_still_clamps(self):
+        # The mixin documents no update_interval requirement.
+        h = _LiveHost(no_data_interval=300)
+        h.live_idle_max_interval = 900
+        h._empty_live_streak = 24
+        h._next_scheduled_start_ts = time.time() - 60
+        assert h._idle_live_interval() == sports_shared._KICKOFF_POLL_FLOOR
+
+    # The regression the 2026-09-20 soak caught: these two methods have to be
+    # tested together. Set _next_scheduled_start_ts by hand and the grace
+    # window looks fine; drive it through the candidate logic the way the live
+    # loop does, and the just-passed kickoff was replaced by the next one on
+    # the card, `now < start` went true again, and the back-off returned to its
+    # ceiling at exactly the wrong moment.
+
+    def test_a_just_passed_kickoff_is_not_replaced_by_the_next_one(self):
+        h = self._idle_host()
+        now = time.time()
+        h._next_scheduled_start_ts = now - 45          # kicked off 45s ago
+        later = datetime.now(timezone.utc) + timedelta(hours=3)
+        h._note_scheduled_start_candidate({"start_time_utc": later})
+        assert h._next_scheduled_start_ts == pytest.approx(now - 45, abs=1)
+
+    def test_and_so_the_grace_window_actually_fires(self):
+        # The end-to-end property: a kickoff moments ago keeps the live cadence
+        # even while the rest of the day's card is being offered.
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() - 45
+        for hours in (3, 4, 7):
+            h._note_scheduled_start_candidate(
+                {"start_time_utc": datetime.now(timezone.utc) + timedelta(hours=hours)})
+        assert h._idle_live_interval() == h.update_interval
+
+    def test_once_the_grace_expires_the_next_kickoff_takes_over(self):
+        h = self._idle_host()
+        h._next_scheduled_start_ts = time.time() - (sports_shared._KICKOFF_GRACE_SECONDS + 60)
+        later = datetime.now(timezone.utc) + timedelta(hours=3)
+        h._note_scheduled_start_candidate({"start_time_utc": later})
+        assert h._next_scheduled_start_ts == pytest.approx(later.timestamp(), abs=1)
+
+    def test_a_nearer_kickoff_does_not_dislodge_the_grace(self):
+        # A game ten minutes out does NOT displace one that kicked off moments
+        # ago, and that is deliberate: while the grace holds we poll at the live
+        # cadence, which is strictly tighter than anything clamping to the
+        # nearer kickoff would give. Letting the candidate win here would set
+        # the wait to ~600s at the exact moment games are starting -- the dead
+        # grace window this change exists to fix.
+        #
+        # The original form of this test asserted the opposite and still passed,
+        # because pytest.approx's default tolerance on a unix timestamp is about
+        # 1790 seconds. Every timestamp assertion here now pins abs=1.
+        h = self._idle_host()
+        passed = time.time() - 45
+        h._next_scheduled_start_ts = passed
+        soon = datetime.now(timezone.utc) + timedelta(minutes=10)
+        h._note_scheduled_start_candidate({"start_time_utc": soon})
+        assert h._next_scheduled_start_ts == pytest.approx(passed, abs=1)
+        # The safety property that makes it correct: 30s beats 600s.
+        assert h._idle_live_interval() == h.update_interval
+
     def test_finding_a_live_game_resets_the_streak(self):
         h = _LiveHost()
         h._note_live_fetch(False)