diff --git a/migrations/versions/1655999df5e3_default_alert_selector.py b/migrations/versions/1655999df5e3_default_alert_selector.py
new file mode 100644
index 0000000000..982eceee23
--- /dev/null
+++ b/migrations/versions/1655999df5e3_default_alert_selector.py
@@ -0,0 +1,27 @@
+"""set default alert selector
+
+Revision ID: 1655999df5e3
+Revises: 7205816877ec
+Create Date: 2024-10-18 11:24:49
+
+"""
+
+from redash.models import db
+
+# revision identifiers, used by Alembic.
+revision = '1655999df5e3'
+down_revision = '7205816877ec'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    db.session.execute("""
+    UPDATE alerts
+    SET options = jsonb_set(options, '{selector}', '"first"')
+    WHERE options->>'selector' IS NULL;
+    """)
+    db.session.commit()
+
+def downgrade():
+    pass