Task: Build a self-hosted URL shortener with a dashboard

n8n workflow JSON:
{"nodes":[{"name":"Webhook","type":"n8n-nodes-base.webhook","position":[350,70],"webhookId":"727b4887-e7f9-405f-bf94-7889c82a8f0b","parameters":{"path":"sh","options":{},"responseMode":"lastNode"},"typeVersion":1},{"name":"Extract URL","type":"n8n-nodes-base.set","position":[650,-80],"parameters":{"values":{"string":[{"name":"url","value":"={{$node[\"Webhook\"].json[\"query\"][\"url\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Check URL","type":"n8n-nodes-base.if","position":[500,70],"parameters":{"conditions":{"boolean":[{"value1":"={{Object($node[\"Webhook\"].json[\"query\"]).hasOwnProperty(\"url\")}}","value2":true}]}},"typeVersion":1},{"name":"Crypto","type":"n8n-nodes-base.crypto","position":[800,-80],"parameters":{"type":"SHA256","value":"={{$node[\"Extract URL\"].json[\"url\"]}}"},"typeVersion":1},{"name":"Airtable","type":"n8n-nodes-base.airtable","position":[1550,-30],"parameters":{"table":"YOUR TABLE NAME","options":{},"operation":"append","application":"YOUR BASE ID"},"credentials":{"airtableApi":"Personal Airtable API creds"},"typeVersion":1},{"name":"Set ID,shortUrl,longUrl","type":"n8n-nodes-base.set","position":[950,-80],"parameters":{"values":{"string":[{"name":"id","value":"={{$node[\"Crypto\"].json[\"data\"].substr(0,6)}}"},{"name":"longUrl","value":"={{$node[\"Extract URL\"].json[\"url\"]}}"},{"name":"shortUrl","value":"=http://n8n.ly/w/go?id={{$node[\"Crypto\"].json[\"data\"].substr(0,6)}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Find by ID","type":"n8n-nodes-base.airtable","position":[1100,-80],"parameters":{"limit":1,"table":"YOUR TABLE NAME","operation":"list","returnAll":false,"application":"YOUR BASE ID","additionalOptions":{"filterByFormula":"=id=\"{{$node[\"Set ID,shortUrl,longUrl\"].json[\"id\"]}}\""}},"credentials":{"airtableApi":"Personal Airtable API creds"},"typeVersion":1,"alwaysOutputData":true},{"name":"Already exists ?","type":"n8n-nodes-base.if","position":[1250,-80],"parameters":{"conditions":{"boolean":[{"value1":"={{$node[\"Find by ID\"].json[\"id\"] != \"\" && $node[\"Find by ID\"].json[\"id\"] != null && $node[\"Find by ID\"].json[\"id\"] != undefined}}","value2":true}]}},"typeVersion":1},{"name":"Set Output","type":"n8n-nodes-base.set","position":[1400,-180],"parameters":{"values":{"string":[{"name":"shortUrl","value":"={{$node[\"Set ID,shortUrl,longUrl\"].json[\"shortUrl\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Set Error output","type":"n8n-nodes-base.set","position":[650,170],"parameters":{"values":{"string":[{"name":"error","value":"url parameter missing"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Set Output1","type":"n8n-nodes-base.set","position":[1700,-30],"parameters":{"values":{"string":[{"name":"shortUrl","value":"={{$node[\"Set ID,shortUrl,longUrl\"].json[\"shortUrl\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Set 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Output2","type":"n8n-nodes-base.set","position":[1400,230],"parameters":{"values":{"string":[{"name":"result","value":"=<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n <title>Redirection</title>\n</head>\n<body>\n \n</body>\n<script>\n const load = function (){\n window.location.replace('{{$node[\"Find by ID1\"].json.fields[\"longUrl\"]}}');\n };\n window.onload = load;\n</script>\n</html>"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Extract Id","type":"n8n-nodes-base.set","position":[650,330],"parameters":{"values":{"string":[{"name":"id","value":"={{$node[\"Webhook1\"].json[\"query\"][\"id\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"404 Error","type":"n8n-nodes-base.set","position":[1100,430],"parameters":{"values":{"string":[{"name":"result","value":"=Short URL not found"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Update clicks","type":"n8n-nodes-base.airtable","position":[1250,230],"parameters":{"id":"={{$node[\"Find by ID1\"].json[\"id\"]}}","table":"YOUR TABLE NAME","fields":["clicks"],"options":{},"operation":"update","application":"YOUR BASE ID","updateAllFields":false},"credentials":{"airtableApi":"Personal Airtable API creds"},"typeVersion":1,"alwaysOutputData":true},{"name":"Prepare clicks count","type":"n8n-nodes-base.set","position":[1100,230],"parameters":{"values":{"string":[{"name":"clicks","value":"={{$node[\"Find by 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totalHosts:0\n    }\n}];\n}\nconst totalLinks = items.length;\nconst totalClick = items.map(item => item.clicks).reduce((acc,val) => acc+=val);\nconst hostsMap = new Map();\nconst hosts = items.map(item => item.host);\nhosts.forEach(host => { \n    hostsMap.set(host,hostsMap.get(host)!==undefined?hostsMap.get(host)+1:1)\n});\n\nconst totalHosts = [...hostsMap.keys()].length;\n\nreturn [{\n    json:{\n        totalLinks,\n        totalClick,\n        totalHosts\n    }\n}];"},"typeVersion":1},{"name":"Set dashboard","type":"n8n-nodes-base.set","position":[950,680],"parameters":{"values":{"string":[{"name":"dashboard","value":"=<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n <title>Dashboard</title>\n</head>\n<style>\n *{\n padding: 0;\n margin: 0;\n border: none;\n box-sizing: border-box;\n }\n body{\n font-family: Roboto;\n 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