json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "datastore entity properties",
      "description": "datastore entity properties",
      "type": "object",
      "properties": {
          "email": {
              "type": "string",
              "minLength": 1
          },
          "hashedPassword": {
              "type": "string",
              "minLength": 1
          },
          "dockerImageName": {
              "type": "string",
              "minLength": 1
          },
          "credentials": {
              "type": "array",
              "minItems": 1,
              "items": {
                  "type": "object",
                  "properties": {
                      "key": {
                          "type": "string",
                          "minLength": 1
                      },
                      "hashedSecret": {
                          "type": "string",
                          "minLength": 1
                      },
                      "createdOn": {
                          "type": "string",
                          "minLength": 1
                      },
                      "expiresOn": {
                          "type": "string",
                          "minLength": 1
                      },
                      "revokedOn": {
                          "type": "string",
                          "minLength": 1
                      }
                  },
                  "required": [
                      "key",
                      "hashedSecret",
                      "createdOn",
                      "expiresOn"
                  ],
                  "additionalProperties": false
              }
          },
          "lastUpdated": {
              "type": "string",
              "minLength": 1
          }
      },
      "required": [
          "email",
          "hashedPassword",
          "dockerImageName",
          "credentials",
          "lastUpdated"
      ],
      "additionalProperties": true
  }