diff --git a/db/knex_migrations/2025-12-29-0000-remove-line-notify.js b/db/knex_migrations/2025-12-29-0000-remove-line-notify.js
new file mode 100644
index 000000000..2011ce852
--- /dev/null
+++ b/db/knex_migrations/2025-12-29-0000-remove-line-notify.js
@@ -0,0 +1,30 @@
+exports.up = async function (knex) {
+    const notifications = await knex("notification").select("id", "config");
+    const lineNotifyIDs = [];
+
+    for (const { id, config } of notifications) {
+        try {
+            const parsedConfig = JSON.parse(config || "{}");
+            const type = typeof parsedConfig.type === "string" ? parsedConfig.type.toLowerCase() : "";
+
+            if (type === "linenotify" || type === "line-notify") {
+                lineNotifyIDs.push(id);
+            }
+        } catch (error) {
+            // Ignore invalid JSON blobs here; they are handled elsewhere in the app.
+        }
+    }
+
+    if (lineNotifyIDs.length === 0) {
+        return;
+    }
+
+    await knex.transaction(async (trx) => {
+        await trx("monitor_notification").whereIn("notification_id", lineNotifyIDs).del();
+        await trx("notification").whereIn("id", lineNotifyIDs).del();
+    });
+};
+
+exports.down = async function () {
+    // Removal of LINE Notify configs is not reversible.
+};