Task: ETL pipeline for text processing

n8n workflow JSON:
{"id":"6","name":"ETL pipeline","nodes":[{"name":"Twitter","type":"n8n-nodes-base.twitter","position":[300,300],"parameters":{"limit":3,"operation":"search","searchText":"=#OnThisDay","additionalFields":{}},"credentials":{"twitterOAuth1Api":"twitter_api"},"typeVersion":1},{"name":"Postgres","type":"n8n-nodes-base.postgres","position":[1100,300],"parameters":{"table":"tweets","columns":"text, score, magnitude","returnFields":"=*"},"credentials":{"postgres":"postgres"},"typeVersion":1},{"name":"MongoDB","type":"n8n-nodes-base.mongoDb","position":[500,300],"parameters":{"fields":"text","options":{},"operation":"insert","collection":"tweets"},"credentials":{"mongoDb":"mongodb"},"typeVersion":1},{"name":"Slack","type":"n8n-nodes-base.slack","position":[1500,200],"parameters":{"text":"=🐦 NEW TWEET with sentiment score {{$json[\"score\"]}} and magnitude {{$json[\"magnitude\"]}} ⬇️\n{{$json[\"text\"]}}","channel":"tweets","attachments":[],"otherOptions":{}},"credentials":{"slackApi":"slack"},"typeVersion":1},{"name":"IF","type":"n8n-nodes-base.if","position":[1300,300],"parameters":{"conditions":{"number":[{"value1":"={{$json[\"score\"]}}","operation":"larger"}]}},"typeVersion":1},{"name":"NoOp","type":"n8n-nodes-base.noOp","position":[1500,400],"parameters":{},"typeVersion":1},{"name":"Google Cloud Natural Language","type":"n8n-nodes-base.googleCloudNaturalLanguage","position":[700,300],"parameters":{"content":"={{$node[\"MongoDB\"].json[\"text\"]}}","options":{}},"credentials":{"googleCloudNaturalLanguageOAuth2Api":"google_nlp"},"typeVersion":1},{"name":"Set","type":"n8n-nodes-base.set","position":[900,300],"parameters":{"values":{"number":[{"name":"score","value":"={{$json[\"documentSentiment\"][\"score\"]}}"},{"name":"magnitude","value":"={{$json[\"documentSentiment\"][\"magnitude\"]}}"}],"string":[{"name":"text","value":"={{$node[\"Twitter\"].json[\"text\"]}}"}]},"options":{}},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","position":[100,300],"parameters":{"triggerTimes":{"item":[{"hour":6}]}},"typeVersion":1}],"active":false,"settings":{},"connections":{"IF":{"main":[[{"node":"Slack","type":"main","index":0}],[{"node":"NoOp","type":"main","index":0}]]},"Set":{"main":[[{"node":"Postgres","type":"main","index":0}]]},"Cron":{"main":[[{"node":"Twitter","type":"main","index":0}]]},"MongoDB":{"main":[[{"node":"Google Cloud Natural Language","type":"main","index":0}]]},"Twitter":{"main":[[{"node":"MongoDB","type":"main","index":0}]]},"Postgres":{"main":[[{"node":"IF","type":"main","index":0}]]},"Google Cloud Natural Language":{"main":[[{"node":"Set","type":"main","index":0}]]}}}