dgtlmoon · Oct 26, 2026 · Sep 23, 2026 · Sep 25, 2026 · Sep 25, 2026 · Oct 1, 2026
diff --git a/changedetectionio/blueprint/ui/__init__.py b/changedetectionio/blueprint/ui/__init__.py
@@ -51,6 +51,19 @@ def _handle_operations(op, uuids, datastore, worker_pool, update_q, queuedWatchM
                 datastore.set_last_viewed(uuid, int(time.time()))
         result_message = gettext("{} watches updated").format(len(uuids))
 
+    elif (op == 'mark-unviewed'):
+        # Re #4382 - wind last_viewed back to the second-newest snapshot, so the row is unviewed
+        # again and [diff] still opens on the latest change (see get_from_version_based_on_last_viewed).
+        # With fewer than two snapshots there is no change to un-view, so those are skipped.
+        updated = 0
+        for uuid in uuids:
+            watch = datastore.data['watching'].get(uuid)
+            if watch and watch.history_n >= 2:
+                sorted_keys = sorted(watch.history.keys(), key=lambda x: int(x))
+                datastore.set_last_viewed(uuid, int(sorted_keys[-2]))
+                updated += 1
+        result_message = gettext("{} watches updated").format(updated)
+
     elif (op == 'mute'):
         for uuid in uuids:
             if datastore.data['watching'].get(uuid):

diff --git a/changedetectionio/blueprint/watchlist/templates/watch-overview.html b/changedetectionio/blueprint/watchlist/templates/watch-overview.html
@@ -303,6 +303,7 @@
         <button type="submit" name="op" value="set-fetch-backend" id="op-set-fetch-backend" hidden></button>
         <button type="submit" name="op" value="set-proxy" id="op-set-proxy" hidden></button>
         <button class="pure-button button-secondary button-xsmall" name="op" value="mark-viewed"><i data-feather="eye" ></i>&nbsp;{{ _('Mark viewed') }}</button>
+        <button class="pure-button button-secondary button-xsmall" name="op" value="mark-unviewed"><i data-feather="eye-off" ></i>&nbsp;{{ _('Mark unviewed') }}</button>
         <button class="pure-button button-secondary button-xsmall" name="op" value="notification-default"><i data-feather="bell" ></i>&nbsp;{{ _('Use default notification') }}</button>
         <button class="pure-button button-secondary button-xsmall" name="op" value="clear-errors"><i data-feather="x-circle" ></i>&nbsp;{{ _('Clear errors') }}</button>
         <button class="pure-button button-secondary button-xsmall" style="background: #dd4242;" name="op" value="clear-history"

diff --git a/changedetectionio/tests/test_element_removal.py b/changedetectionio/tests/test_element_removal.py
@@ -206,7 +206,7 @@ def test_element_removal_full(client, live_server, measure_memory_usage, datasto
 
     # There should not be an unviewed change, as changes should be removed
     res = client.get(url_for("watchlist.index"))
-    assert b"unviewed" not in res.data
+    assert b'has-unread-changes' not in res.data
 
 # Re #2752
 def test_element_removal_nth_offset_no_shift(client, live_server, measure_memory_usage, datastore_path):

diff --git a/changedetectionio/tests/test_ignorehyperlinks.py b/changedetectionio/tests/test_ignorehyperlinks.py
@@ -111,7 +111,7 @@ def test_render_anchor_tag_content_true(client, live_server, measure_memory_usag
     # since the link has changed, and we chose to render anchor tag content,
     # we should detect a change (new 'has-unread-changes' class)
     res = client.get(url_for("watchlist.index"))
-    assert b"unviewed" in res.data
+    assert b'has-unread-changes' in res.data
     assert b"/test-endpoint" in res.data
 
     # Cleanup everything

diff --git a/changedetectionio/tests/test_mark_unviewed.py b/changedetectionio/tests/test_mark_unviewed.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+
+"""Re #4382 - the watch list "Mark unviewed" bulk operation.
+
+Mark unviewed winds last_viewed back to the second-newest snapshot, so the row is unviewed again
+and the [diff] link still opens on the latest change. A watch with only one snapshot has no
+change to un-view, so it must be left alone.
+"""
+
+from flask import url_for
+
+from .util import set_original_response, set_modified_response, wait_for_all_checks, delete_all_watches, \
+    extract_UUID_from_client
+
+
+def test_mark_unviewed(client, live_server, measure_memory_usage, datastore_path):
+    set_original_response(datastore_path=datastore_path)
+    datastore = live_server.app.config['DATASTORE']
+
+    client.post(
+        url_for("ui.ui_views.form_quick_watch_add"),
+        data={"url": url_for('test_endpoint', _external=True), "tags": ''},
+        follow_redirects=True
+    )
+    wait_for_all_checks(client)
+    uuid = extract_UUID_from_client(client)
+    watch = datastore.data['watching'][uuid]
+
+    # Only one snapshot - nothing to un-view, so the operation must not flag the row
+    res = client.post(url_for("ui.form_watch_list_checkbox_operations"),
+                      data={"op": "mark-unviewed", "uuids": uuid},
+                      follow_redirects=True)
+    assert b'0 watches updated' in res.data
+    assert not watch.has_unviewed
+    assert b'has-unread-changes' not in res.data
+
+    # A real change lands -> unviewed
+    set_modified_response(datastore_path=datastore_path)
+    client.post(url_for("ui.form_watch_checknow"), follow_redirects=True)
+    wait_for_all_checks(client)
+    assert watch.has_unviewed
+
+    res = client.post(url_for("ui.form_watch_list_checkbox_operations"),
+                      data={"op": "mark-viewed", "uuids": uuid},
+                      follow_redirects=True)
+    assert not watch.has_unviewed
+    assert b'has-unread-changes' not in res.data
+
+    # The actual feature - it comes back as unviewed
+    res = client.post(url_for("ui.form_watch_list_checkbox_operations"),
+                      data={"op": "mark-unviewed", "uuids": uuid},
+                      follow_redirects=True)
+    assert b'1 watches updated' in res.data
+    assert watch.has_unviewed
+    assert b'has-unread-changes' in res.data
+
+    # ...and [diff] still opens on the latest change, not the whole history
+    sorted_keys = sorted(watch.history.keys(), key=lambda x: int(x))
+    assert watch.get_from_version_based_on_last_viewed == sorted_keys[-2]
+
+    delete_all_watches(client)
diff --git a/changedetectionio/translations/cs/LC_MESSAGES/messages.po b/changedetectionio/translations/cs/LC_MESSAGES/messages.po
@@ -2792,6 +2792,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Označit jako shlédnuté"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Použít výchozí oznámení"

diff --git a/changedetectionio/translations/de/LC_MESSAGES/messages.po b/changedetectionio/translations/de/LC_MESSAGES/messages.po
@@ -2837,6 +2837,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Markierung angesehen"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Standardbenachrichtigung verwenden"

diff --git a/changedetectionio/translations/en_GB/LC_MESSAGES/messages.po b/changedetectionio/translations/en_GB/LC_MESSAGES/messages.po
@@ -2786,6 +2786,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr ""
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr ""

diff --git a/changedetectionio/translations/en_US/LC_MESSAGES/messages.po b/changedetectionio/translations/en_US/LC_MESSAGES/messages.po
@@ -2786,6 +2786,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr ""
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr ""

diff --git a/changedetectionio/translations/es/LC_MESSAGES/messages.po b/changedetectionio/translations/es/LC_MESSAGES/messages.po
@@ -2863,6 +2863,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Marcar visto"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Usar notificación predeterminada"

diff --git a/changedetectionio/translations/fr/LC_MESSAGES/messages.po b/changedetectionio/translations/fr/LC_MESSAGES/messages.po
@@ -2797,6 +2797,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Marquer consulté"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Utiliser la notification par défaut"

diff --git a/changedetectionio/translations/id/LC_MESSAGES/messages.po b/changedetectionio/translations/id/LC_MESSAGES/messages.po
@@ -2895,6 +2895,10 @@ msgstr "Atur proksi untuk yang dipilih"
 msgid "Mark viewed"
 msgstr "Tandai telah dilihat"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Gunakan notifikasi default"

diff --git a/changedetectionio/translations/it/LC_MESSAGES/messages.po b/changedetectionio/translations/it/LC_MESSAGES/messages.po
@@ -2788,6 +2788,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Segna come visualizzato"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Usa notifica predefinita"

diff --git a/changedetectionio/translations/ja/LC_MESSAGES/messages.po b/changedetectionio/translations/ja/LC_MESSAGES/messages.po
@@ -2805,6 +2805,10 @@ msgstr "選択項目のプロキシを設定"
 msgid "Mark viewed"
 msgstr "既読にする"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "デフォルト通知を使用"

diff --git a/changedetectionio/translations/ko/LC_MESSAGES/messages.po b/changedetectionio/translations/ko/LC_MESSAGES/messages.po
@@ -2796,6 +2796,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "본 것으로 표시"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "기본 알림 사용"

diff --git a/changedetectionio/translations/messages.pot b/changedetectionio/translations/messages.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: changedetection.io 0.60.9\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2026-10-24 21:02+0200\n"
+"POT-Creation-Date: 2026-10-26 11:14+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -2785,6 +2785,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr ""
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr ""

diff --git a/changedetectionio/translations/pl/LC_MESSAGES/messages.po b/changedetectionio/translations/pl/LC_MESSAGES/messages.po
@@ -2941,6 +2941,10 @@ msgstr "Ustaw serwer proxy dla zaznaczonych obserwacji"
 msgid "Mark viewed"
 msgstr "Oznacz jako przeczytane"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Użyj domyślnego powiadomienia"

diff --git a/changedetectionio/translations/pt_BR/LC_MESSAGES/messages.po b/changedetectionio/translations/pt_BR/LC_MESSAGES/messages.po
@@ -2834,6 +2834,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Marcar como visualizado"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Usar notificação padrão"

diff --git a/changedetectionio/translations/ru/LC_MESSAGES/messages.po b/changedetectionio/translations/ru/LC_MESSAGES/messages.po
@@ -2900,6 +2900,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Отметить просмотренные"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Использовать уведомление по умолчанию"

diff --git a/changedetectionio/translations/tr/LC_MESSAGES/messages.po b/changedetectionio/translations/tr/LC_MESSAGES/messages.po
@@ -2839,6 +2839,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Görüldü olarak işaretle"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Varsayılan bildirimi kullan"

diff --git a/changedetectionio/translations/uk/LC_MESSAGES/messages.po b/changedetectionio/translations/uk/LC_MESSAGES/messages.po
@@ -2818,6 +2818,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "Позначити як переглянуте"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "Вик. сповіщення за замовчуванням"

diff --git a/changedetectionio/translations/zh/LC_MESSAGES/messages.po b/changedetectionio/translations/zh/LC_MESSAGES/messages.po
@@ -2792,6 +2792,10 @@ msgstr ""
 msgid "Mark viewed"
 msgstr "标记为已读"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "使用默认通知"

diff --git a/changedetectionio/translations/zh_Hant_TW/LC_MESSAGES/messages.po b/changedetectionio/translations/zh_Hant_TW/LC_MESSAGES/messages.po
@@ -2797,6 +2797,10 @@ msgstr "為所選項目設定代理伺服器"
 msgid "Mark viewed"
 msgstr "標記為已讀"
 
+#: changedetectionio/blueprint/watchlist/templates/watch-overview.html
+msgid "Mark unviewed"
+msgstr ""
+
 #: changedetectionio/blueprint/watchlist/templates/watch-overview.html
 msgid "Use default notification"
 msgstr "使用預設通知"