diff --git a/cockatrice/src/client/crash/crash_reporter.cpp b/cockatrice/src/client/crash/crash_reporter.cpp
index 07a0389c7..cba84994c 100644
--- a/cockatrice/src/client/crash/crash_reporter.cpp
+++ b/cockatrice/src/client/crash/crash_reporter.cpp
@@ -614,3 +614,19 @@ QString CrashReporter::redactCockatriceUrls(const QString &line)
     redacted.append(line.mid(pos));
     return redacted;
 }
+
+void CrashReporter::addBreadcrumb(const char *category, const char *message)
+{
+#if COCKATRICE_WITH_CRASH_REPORTING
+    if (category == nullptr || message == nullptr) {
+        return;
+    }
+    sentry_value_t crumb = sentry_value_new_breadcrumb("default", message);
+    sentry_value_set_by_key(crumb, "category", sentry_value_new_string(category));
+    sentry_value_set_by_key(crumb, "level", sentry_value_new_string("info"));
+    sentry_add_breadcrumb(crumb);
+#else
+    Q_UNUSED(category);
+    Q_UNUSED(message);
+#endif
+}
diff --git a/cockatrice/src/client/crash/crash_reporter.h b/cockatrice/src/client/crash/crash_reporter.h
index aecc6ade3..f06103188 100644
--- a/cockatrice/src/client/crash/crash_reporter.h
+++ b/cockatrice/src/client/crash/crash_reporter.h
@@ -167,6 +167,17 @@ public:
     static QString sanitizeLogLine(const QString &line);
     static QString redactCockatriceUrls(const QString &line);
 
+    /**
+     * @brief Record a fixed-text lifecycle breadcrumb on the active Sentry scope.
+     *
+     * Native crashes whose stack walk loses the in-app frames (e.g. a QMap lookup
+     * that dies inside Qt's string comparison) otherwise arrive with no hint of
+     * what the client was doing. Only pass compile-time string literals: no user
+     * names, card names, paths or URLs, so no personal data can leak through this
+     * channel. Thread-safe; a no-op in OFF builds or before init().
+     */
+    static void addBreadcrumb(const char *category, const char *message);
+
 private:
     bool ready = false;
     QString sentryDatabasePath;
diff --git a/cockatrice/src/interface/widgets/server/user/user_list_widget.cpp b/cockatrice/src/interface/widgets/server/user/user_list_widget.cpp
index 943b4d5de..b7f4614c9 100644
--- a/cockatrice/src/interface/widgets/server/user/user_list_widget.cpp
+++ b/cockatrice/src/interface/widgets/server/user/user_list_widget.cpp
@@ -1,5 +1,6 @@
 #include "user_list_widget.h"
 
+#include "../../../../client/crash/crash_reporter.h"
 #include "../../../../client/settings/cache_settings.h"
 #include "../../interface/pixel_map_generator.h"
 #include "../../interface/theme_manager.h"
@@ -1221,6 +1222,7 @@ void UserListWidget::processUserInfo(Section section, const ServerInfo_User &use
 
 bool UserListWidget::deleteUser(const QString &userName)
 {
+    CrashReporter::addBreadcrumb("users", "user list row removed");
     if (sectioned) {
         // The user may own several rows (one per section). Drop them all.
         bool removed = false;
diff --git a/cockatrice/src/interface/widgets/tabs/tab_supervisor.cpp b/cockatrice/src/interface/widgets/tabs/tab_supervisor.cpp
index 7647b8ca8..c5cb7fda6 100644
--- a/cockatrice/src/interface/widgets/tabs/tab_supervisor.cpp
+++ b/cockatrice/src/interface/widgets/tabs/tab_supervisor.cpp
@@ -1,5 +1,6 @@
 #include "tab_supervisor.h"
 
+#include "../../../client/crash/crash_reporter.h"
 #include "../../../client/settings/cache_settings.h"
 #include "../../../client/settings/shortcuts_settings.h"
 #include "../../intents/contexts/context_connect_to_server.h"
@@ -593,6 +594,7 @@ void TabSupervisor::startLocal(const QList<AbstractClient *> &_clients)
  */
 void TabSupervisor::stop()
 {
+    CrashReporter::addBreadcrumb("tabs", "tab supervisor stopping");
     if ((!client) && localClients.isEmpty()) {
         return;
     }
@@ -1003,6 +1005,7 @@ void TabSupervisor::updateLatencyTooltip(const LatencyTracker::Stats &stats)
 
 void TabSupervisor::gameJoined(const Event_GameJoined &event)
 {
+    CrashReporter::addBreadcrumb("tabs", "game joined");
     QMap<int, QString> roomGameTypes;
     TabRoom *room = roomTabs.value(event.game_info().room_id());
     if (room) {
@@ -1055,6 +1058,7 @@ void TabSupervisor::gameLeft(TabGame *tab)
 
 void TabSupervisor::addRoomTab(const ServerInfo_Room &info, bool setCurrent)
 {
+    CrashReporter::addBreadcrumb("tabs", "room tab added");
     auto *tab = new TabRoom(this, client, userInfo, info);
     connect(tab, &TabRoom::maximizeClient, this, &TabSupervisor::maximizeMainWindow);
     connect(tab, &TabRoom::roomClosing, this, &TabSupervisor::roomLeft);
@@ -1472,6 +1476,7 @@ void TabSupervisor::actShowPopup(const QString &message)
 
 void TabSupervisor::processUserLeft(const QString &userName)
 {
+    CrashReporter::addBreadcrumb("users", "user left");
     TabMessage *tab = messageTabs.value(userName);
     if (tab) {
         tab->processUserLeft();
diff --git a/cockatrice/src/main.cpp b/cockatrice/src/main.cpp
index b4dc0610f..e82867f3f 100644
--- a/cockatrice/src/main.cpp
+++ b/cockatrice/src/main.cpp
@@ -427,6 +427,23 @@ int main(int argc, char *argv[])
     CardDatabaseManager::setCardDatabasePathProvider(&SettingsCache::instance());
     CardDatabaseManager::setCardSetPriorityController(&SettingsCache::instance().cardDatabase());
 
+    // Lifecycle breadcrumbs for native crash reports (see COCKATRICE-DESKTOP-1R): the live
+    // card maps are replaced wholesale on reset, so knowing whether a crash followed a reload
+    // narrows down which QMap was being read. Direct connections: the SDK call is thread-safe
+    // and loading signals may come from a QtConcurrent worker.
+    {
+        CardDatabase *crumbDb = CardDatabaseManager::getInstance();
+        QObject::connect(
+            crumbDb, &CardDatabase::cardDatabaseReset, crumbDb,
+            [] { CrashReporter::addBreadcrumb("card_db", "card database snapshot swapped in"); }, Qt::DirectConnection);
+        QObject::connect(
+            crumbDb, &CardDatabase::cardDatabaseLoadingFinished, crumbDb,
+            [] { CrashReporter::addBreadcrumb("card_db", "card database loading finished"); }, Qt::DirectConnection);
+        QObject::connect(
+            crumbDb, &CardDatabase::cardDatabaseLoadingFailed, crumbDb,
+            [] { CrashReporter::addBreadcrumb("card_db", "card database loading failed"); }, Qt::DirectConnection);
+    }
+
     qCInfo(MainLog) << "Starting main program";
 
     // Front-load the card database before constructing the main window. The
diff --git a/tests/crash_reporter_test.cpp b/tests/crash_reporter_test.cpp
index e44a34a60..208812a4b 100644
--- a/tests/crash_reporter_test.cpp
+++ b/tests/crash_reporter_test.cpp
@@ -418,6 +418,16 @@ TEST(CrashReporterTest, BeginSessionEndSessionRoundTripReportsClean)
     reporter.endSession();
 }
 
+TEST(CrashReporterTest, AddBreadcrumbIsSafeWithoutInitAndWithNullArguments)
+{
+    // Breadcrumbs are emitted from GUI slots and QtConcurrent workers regardless of whether
+    // the SDK was initialised (empty DSN, Never consent, OFF builds); none of these may crash.
+    CrashReporter::addBreadcrumb("card_db", "card database snapshot swapped in");
+    CrashReporter::addBreadcrumb(nullptr, "message");
+    CrashReporter::addBreadcrumb("category", nullptr);
+    SUCCEED();
+}
+
 } // namespace
 
 int main(int argc, char **argv)