diff --git a/tests/test_trials.py b/tests/test_trials.py
index 8029fe3..2f36c41 100644
--- a/tests/test_trials.py
+++ b/tests/test_trials.py
@@ -53,3 +53,19 @@ def test_tick_reaches_expiry(tracker):
     assert t["unused_boot_days"] == DEFAULT_TRIAL_BUDGET
     assert t["expired"] is True
     assert t["days_remaining"] == 0
+
+
+def test_reset_zeroes_counter(tracker):
+    tracker.start_trial("Pack")
+    with patch("tracker.datetime") as m:
+        m.now.return_value = _ahead(1)
+        tracker.tick_boot_days()
+    assert tracker.get_trials()[0]["unused_boot_days"] == 1
+    tracker.reset_trials_for({"Pack", "Not-On-Trial"})
+    assert tracker.get_trials()[0]["unused_boot_days"] == 0
+
+
+def test_reset_empty_is_noop(tracker):
+    tracker.start_trial("Pack")
+    tracker.reset_trials_for(set())
+    assert tracker.get_trials()[0]["unused_boot_days"] == 0
diff --git a/tracker.py b/tracker.py
index 76ce991..0ac5b68 100644
--- a/tracker.py
+++ b/tracker.py
@@ -450,6 +450,25 @@ class UsageTracker:
             finally:
                 conn.close()
 
+    def reset_trials_for(self, packages):
+        """Reset the unused-day counter for any of these packages that are on trial."""
+        if not packages:
+            return
+        today = datetime.now(timezone.utc).date().isoformat()
+        with self._lock:
+            self._ensure_db()
+            conn = self._connect()
+            try:
+                conn.executemany(
+                    """UPDATE trial_packages
+                       SET unused_boot_days = 0, last_use_day = ?
+                       WHERE package = ?""",
+                    [(today, p) for p in packages],
+                )
+                conn.commit()
+            finally:
+                conn.close()
+
     def reset(self):
         """Clear all tracked data."""
         with self._lock: