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diff --git a/src/icalraii.h b/src/icalraii.h
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+++ b/src/icalraii.h
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+/*
+ * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#pragma once
+
+#include <libical/ical.h>
+
+#include <cstdlib>
+#include <memory>
+
+/// Owners for libical handles, the calendar's counterpart to nmraii.h.
+///
+/// The same rule as notmuch's: no libical pointer leaves calendarstore.cpp,
+/// the one file that includes this header. unique_ptr rather than NmHandle's
+/// template because every libical handle here has exactly one destroy
+/// function and no aliasing, which is what unique_ptr already expresses.
+struct IcalComponentFree {
+    void operator()(icalcomponent *c) const { icalcomponent_free(c); }
+};
+using IcalComponent = std::unique_ptr<icalcomponent, IcalComponentFree>;
+
+struct IcalRecurFree {
+    void operator()(icalrecur_iterator *i) const { icalrecur_iterator_free(i); }
+};
+using IcalRecurIterator = std::unique_ptr<icalrecur_iterator, IcalRecurFree>;
+
+/// For strings returned by the `*_r` functions, which the caller must free().
+/// The plain variants return a ring buffer libical reuses, so a pointer kept
+/// from one is overwritten by a later call.
+struct IcalStringFree {
+    void operator()(char *s) const { std::free(s); }
+};
+using IcalString = std::unique_ptr<char, IcalStringFree>;