json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "name": {
              "type": "string",
              "minLength": 1,
              "maxLength": 255
          },
          "description": {
              "type": "string",
              "maxLength": 32767
          },
          "columns": {
              "type": "array",
              "items": {
                  "title": "Data Table Column",
                  "description": "Schema for a single Data Table Column",
                  "type": "object",
                  "properties": {
                      "name": {
                          "type": "string",
                          "pattern": "^[0-9a-zA-Z_-]{1,255}$"
                      },
                      "dataType": {
                          "type": "string",
                          "enum": [
                              "string",
                              "number",
                              "boolean"
                          ]
                      },
                      "constraint": {
                          "type": "string",
                          "enum": [
                              "unique",
                              "required",
                              "optional"
                          ]
                      },
                      "defaultValue": {
                          "type": [
                              "string",
                              "number",
                              "boolean"
                          ]
                      }
                  },
                  "required": [
                      "name",
                      "dataType",
                      "constraint"
                  ],
                  "additionalProperties": false
              },
              "maxItems": 50
          }
      },
      "required": [
          "name"
      ],
      "additionalProperties": false
  }