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

n8n workflow:
{"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":"={{$node[\"Set ID,shortUrl,longUrl\"].json[\"shortUrl\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Set 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missing."}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Check Id","type":"n8n-nodes-base.if","position":[500,430],"parameters":{"conditions":{"boolean":[{"value1":"={{Object($node[\"Webhook1\"].json[\"query\"]).hasOwnProperty(\"id\")}}","value2":true}]}},"typeVersion":1},{"name":"Find by ID1","type":"n8n-nodes-base.airtable","position":[800,330],"parameters":{"limit":1,"table":"YOUR TABLE NAME","operation":"list","returnAll":false,"application":"YOUR BASE ID","additionalOptions":{"filterByFormula":"=id=\"{{$node[\"Extract Id\"].json[\"id\"]}}\""}},"credentials":{"airtableApi":"Personal Airtable API creds"},"typeVersion":1,"alwaysOutputData":true},{"name":"Already exists ?1","type":"n8n-nodes-base.if","position":[950,330],"parameters":{"conditions":{"boolean":[{"value1":"={{$node[\"Find by ID1\"].json[\"id\"] != \"\" && $node[\"Find by ID1\"].json[\"id\"] != null && $node[\"Find by ID1\"].json[\"id\"] != undefined}}","value2":true}]}},"typeVersion":1},{"name":"Set Output2","type":"n8n-nodes-base.set","position":[1400,230],"parameters":{"values":{"string":[{"name":"result","value":"=<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n <title>Redirection</title>\n</head>\n<body>\n \n</body>\n<script>\n const load = function (){\n window.location.replace('{{$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 ID1\"].json[\"fields\"][\"clicks\"]+1}}"}]},"options":{}},"typeVersion":1},{"name":"Webhook2","type":"n8n-nodes-base.webhook","position":[350,680],"webhookId":"8ac18eb4-bcc5-4817-b76d-d93094755ed2","parameters":{"path":"/dashboard","options":{"responseHeaders":{"entries":[{"name":"Content-Type","value":"text/html"}]},"responsePropertyName":"dashboard"},"responseMode":"lastNode"},"typeVersion":1},{"name":"Find by ID2","type":"n8n-nodes-base.airtable","position":[550,680],"parameters":{"table":"YOUR TABLE NAME","operation":"list","application":"YOUR BASE ID","additionalOptions":{}},"credentials":{"airtableApi":"Personal Airtable API creds"},"typeVersion":1,"alwaysOutputData":true},{"name":"Extract stats","type":"n8n-nodes-base.function","position":[750,680],"parameters":{"functionCode":"\nitems = items.filter(item=> Object.keys(item.json).length !==0).map(item => item.json.fields);\nif(items.length === 0){\nreturn [{\n    json:{\n        totalLinks:0,\n        totalClick:0,\n        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 font-style: normal;\n }\n .main{\n padding: 3rem 15rem;\n width: 70vw;\n min-height: 100vh;\n display: flex;\n flex-direction: column;\n margin: 0 auto; \n }\n .header{\n display: flex;\n flex-direction: row;\n justify-content: space-between;\n align-items: center;\n padding: 1rem 0.5rem;\n\n }\n .dashboard{\n display: grid;\n grid-template-rows: repeat(2, 1fr);\n grid-template-columns: repeat(2, 1fr);\n column-gap: 50px;\n row-gap: 50px;\n min-height: 70vh;\n min-width: calc(100vw-5rem);\n }\n .primary-text{\n color: #FF6D5A;\n font-family: Roboto;\n font-style: initial;\n font-weight: 500;\n font-size: 18px;\n line-height: 28px;\n /* center */\n display: flex;\n align-items: center;\n justify-content: center;\n }\n .main-box{\n min-height: 100%;\n min-width: 100%;\n background-color: #FF6D5A;\n grid-column: 1 / span 2;\n /* center */\n display: flex;\n flex-direction: rows;\n align-items: center;\n justify-content: center;\n /* font style */\n font-weight: bold;\n font-size: 96px;\n 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