Task: Send SMS alerts based on database queries (Twilio and Postgres)

n8n workflow JSON:
{"id":"34","name":"Monitoring and alerting","nodes":[{"name":"Cron","type":"n8n-nodes-base.cron","position":[250,200],"parameters":{},"typeVersion":1},{"name":"Postgres","type":"n8n-nodes-base.postgres","position":[450,200],"parameters":{"query":"SELECT * FROM n8n WHERE value > 70 AND notification = false;","operation":"executeQuery"},"credentials":{"postgres":"Postgres"},"typeVersion":1},{"name":"Twilio","type":"n8n-nodes-base.twilio","position":[650,200],"parameters":{"to":"","from":"","message":"=🚨 The Sensor ({{$node[\"Postgres\"].json[\"sensor_id\"]}}) showed a reading of {{$node[\"Postgres\"].json[\"value\"]}}."},"credentials":{"twilioApi":"Twilio"},"typeVersion":1},{"name":"Set","type":"n8n-nodes-base.set","position":[850,200],"parameters":{"values":{"number":[{"name":"id","value":"={{$node[\"Postgres\"].json[\"id\"]}}"}],"boolean":[{"name":"notification","value":true}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Postgres1","type":"n8n-nodes-base.postgres","position":[1050,200],"parameters":{"table":"n8n","columns":"notification","operation":"update"},"credentials":{"postgres":"Postgres"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Set":{"main":[[{"node":"Postgres1","type":"main","index":0}]]},"Cron":{"main":[[{"node":"Postgres","type":"main","index":0}]]},"Twilio":{"main":[[{"node":"Set","type":"main","index":0}]]},"Postgres":{"main":[[{"node":"Twilio","type":"main","index":0}]]}}}