The workflow JSON

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{
  "name": "Create - KB",
  "nodes": [
    {
      "parameters": {
        "schema": {
          "__rl": true,
          "mode": "list",
          "value": "public"
        },
        "table": {
          "__rl": true,
          "value": "enlaight_knowledge_bases",
          "mode": "list",
          "cachedResultName": "enlaight_knowledge_bases"
        },
        "columns": {
          "mappingMode": "defineBelow",
          "value": {
            "name": "={{ $('Webhook').item.json.body.name }}",
            "description": "={{ $('Webhook').item.json.body.description }}",
            "hash_id": "={{ $json.data.toLowerCase() }}"
          },
          "matchingColumns": [
            "id"
          ],
          "schema": [
            {
              "id": "id",
              "displayName": "id",
              "required": false,
              "defaultMatch": true,
              "display": true,
              "type": "number",
              "canBeUsedToMatch": true,
              "removed": true
            },
            {
              "id": "name",
              "displayName": "name",
              "required": true,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "canBeUsedToMatch": true
            },
            {
              "id": "description",
              "displayName": "description",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "canBeUsedToMatch": true
            },
            {
              "id": "avatar",
              "displayName": "avatar",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "canBeUsedToMatch": true,
              "removed": true
            },
            {
              "id": "hash_id",
              "displayName": "hash_id",
              "required": true,
              "defaultMatch": false,
              "display": true,
              "type": "string",
              "canBeUsedToMatch": true
            },
            {
              "id": "created_at",
              "displayName": "created_at",
              "required": false,
              "defaultMatch": false,
              "display": true,
              "type": "dateTime",
              "canBeUsedToMatch": true,
              "removed": true
            }
          ],
          "attemptToConvertTypes": false,
          "convertFieldsToString": false
        },
        "options": {}
      },
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 2.6,
      "position": [
        1000,
        -300
      ],
      "id": "ad9126c4-e071-4099-8131-02974ca6d3f8",
      "name": "enlaight_knowledge_bases",
      "credentials": {
        "postgres": {
          "name": "<your credential>"
        }
      },
      "onError": "continueErrorOutput"
    },
    {
      "parameters": {
        "action": "generate",
        "encodingType": "base64"
      },
      "type": "n8n-nodes-base.crypto",
      "typeVersion": 1,
      "position": [
        800,
        -300
      ],
      "id": "de51dd88-3255-4cb9-9d4d-b6f7e2bdd7af",
      "name": "generate-hash"
    },
    {
      "parameters": {
        "operation": "executeQuery",
        "query": "select count(*) from enlaight_knowledge_bases where name = '{{ $('Webhook').item.json.body.name }}';",
        "options": {}
      },
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 2.6,
      "position": [
        280,
        -160
      ],
      "id": "3431d3d8-b9af-4bff-a719-06242e8c1774",
      "name": "enlaight_knowledge_bases1",
      "alwaysOutputData": true,
      "credentials": {
        "postgres": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "e928902e-f8b6-4e16-94c0-f9e7cdb3d4e2",
              "leftValue": "={{ Number($json.count) }}",
              "rightValue": 0,
              "operator": {
                "type": "number",
                "operation": "equals"
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        500,
        -160
      ],
      "id": "256696c2-9770-4111-8f1a-56c5b3fc60cc",
      "name": "If"
    },
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "kb/create/",
        "authentication": "headerAuth",
        "responseMode": "responseNode",
        "options": {}
      },
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        -280,
        -20
      ],
      "id": "1b55d874-f464-4170-b9c1-7bfc1a1225c4",
      "name": "Webhook",
      "credentials": {
        "httpHeaderAuth": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "={\n  \"status\": \"success\",\n  \"name\": \"{{ $json.name }}\",\n  \"description\": \"{{ $json.description }}\",\n  \"hash_id\": \"{{ $json.hash_id }}\",\n  \"created_at\": \"{{ $json.created_at }}\"\n}",
        "options": {}
      },
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.2,
      "position": [
        1340,
        -400
      ],
      "id": "b5859682-1a04-4d88-987d-3131a4ad372f",
      "name": "Respond to Webhook2"
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "{\n  \"status\": \"error\",\n  \"reason\": \"invalid input\"\n}",
        "options": {}
      },
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.2,
      "position": [
        280,
        120
      ],
      "id": "55c0b73f-b136-46e9-8a58-6f320a3d076c",
      "name": "respond_error_invalid_response"
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "e928902e-f8b6-4e16-94c0-f9e7cdb3d4e2",
              "leftValue": "={{ $json.body.name }}",
              "rightValue": 0,
              "operator": {
                "type": "string",
                "operation": "exists",
                "singleValue": true
              }
            },
            {
              "id": "34ef1b7c-48f3-4eeb-ada5-98cc087655c0",
              "leftValue": "={{ $json.body.description }}",
              "rightValue": "",
              "operator": {
                "type": "string",
                "operation": "exists",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        -60,
        -20
      ],
      "id": "6903e0a2-49da-46d8-8aa8-d34e7510d774",
      "name": "check_payload"
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "{\n  \"status\": \"error\",\n  \"reason\": \"knowledge base already exists\"\n}",
        "options": {}
      },
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.2,
      "position": [
        800,
        -40
      ],
      "id": "9b023a9d-4b12-4ba6-9b1b-1d3eacd4c108",
      "name": "respond_error_kb_already_exists"
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "{\n  \"status\": \"error\",\n  \"reason\": \"Error while creating knowledge base\"\n}",
        "options": {}
      },
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.2,
      "position": [
        1340,
        -200
      ],
      "id": "80b00cb1-ed98-4460-aacb-639aee76763a",
      "name": "respond_error_while_creating"
    }
  ],
  "connections": {
    "enlaight_knowledge_bases": {
      "main": [
        [
          {
            "node": "Respond to Webhook2",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "respond_error_while_creating",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "generate-hash": {
      "main": [
        [
          {
            "node": "enlaight_knowledge_bases",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "enlaight_knowledge_bases1": {
      "main": [
        [
          {
            "node": "If",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "If": {
      "main": [
        [
          {
            "node": "generate-hash",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "respond_error_kb_already_exists",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Webhook": {
      "main": [
        [
          {
            "node": "check_payload",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "check_payload": {
      "main": [
        [
          {
            "node": "enlaight_knowledge_bases1",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "respond_error_invalid_response",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  },
  "meta": {
    "templateCredsSetupCompleted": true
  }
}