Schema

The following example shows how an event appears in Krenalis after it has been received and processed. It illustrates most of the fields defined in the event schema. In real scenarios, the actual set of fields varies depending on the type of event sent, the SDK used, and the user's state (authenticated or anonymous).

{
  "kpid": "8bde45c4-92a1-4d8a-a2ce-36f70cfd1f52",
  "connectionId": 129402661,
  "anonymousId": "f8d65981-a881-4fe4-b7fc-9e7c4a339019",
  "channel": "web",
  "category": "E-commerce",
  "context": {
    "app": {
      "name": "Krenalis Storefront",
      "version": "2.3.1",
      "build": "23104",
      "namespace": "com.krenalis.storefront"
    },
    "browser": {
      "name": "Chrome",
      "version": "129.0.6668"
    },
    "campaign": {
      "name": "Seasonal Promotion",
      "source": "newsletter",
      "medium": "email",
      "term": "fall-sale",
      "content": "header-banner"
    },
    "device": {
      "id": "A1B2C3D4E5F6",
      "advertisingId": "7e11a1dc-09c3-42a2-9414-87e5a4c8f1a7",
      "adTrackingEnabled": true,
      "manufacturer": "Apple",
      "model": "MacBookPro18,3",
      "name": "Mary's MacBook Pro",
      "type": "desktop",
      "token": "device-token-9d82f3"
    },
    "ip": "73.112.88.145",
    "library": {
      "name": "krenalis.js",
      "version": "1.0.0"
    },
    "locale": "en-US",
    "location": {
      "city": "San Francisco",
      "country": "United States",
      "latitude": 37.7749,
      "longitude": -122.4194,
      "speed": 0
    },
    "network": {
      "bluetooth": false,
      "carrier": "Verizon",
      "cellular": false,
      "wifi": true
    },
    "os": {
      "name": "macOS",
      "other": null,
      "version": "14.4.1"
    },
    "page": {
      "path": "/products/wool-jacket",
      "referrer": "https://www.mystore.com/",
      "search": "?color=navy&size=m",
      "title": "Wool Jacket – Krenalis",
      "url": "https://www.mystore.com/products/wool-jacket?color=navy&size=m"
    },
    "referrer": {
      "id": "newsletter-seasonal",
      "type": "email"
    },
    "screen": {
      "width": 2560,
      "height": 1600,
      "density": 2.00
    },
    "session": {
      "id": 1760443328460,
      "start": false
    },
    "timezone": "America/Los_Angeles",
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.6668.100 Safari/537.36"
  },
  "event": "Product Added",
  "groupId": "acme-inc",
  "messageId": "08fa701f-49b7-4253-b3c4-1504e49004ec",
  "properties": {
    "product_id": "SKU-001247",
    "product_name": "Women's Wool Jacket",
    "category": "Outerwear",
    "price": 149.99,
    "currency": "USD",
    "quantity": 1,
    "coupon": "SUMMER_SALE",
    "inventory_status": "in_stock",
    "color": "navy",
    "size": "M"
  },
  "receivedAt": "2025-10-14T15:32:48.985Z",
  "sentAt": "2025-10-14T15:32:47.610Z",
  "originalTimestamp": "2025-10-14T15:32:46.820Z",
  "timestamp": "2025-10-14T15:32:46.820Z",
  "traits": {
    "name": "Mary Johnson",
    "email": "mary.johnson@example.com",
    "gender": "female",
    "country": "United States",
    "city": "San Francisco",
    "plan": "premium",
    "age": 32
  },
  "type": "track",
  "previousId": "temp-548271",
  "userId": "user-982174"
}

The event schema

The event schema defines the structure of an event, similar to how the profile schema (Customer Model Schema) defines the structure of a user. Unlike the profile schema, which can be customized for each organization, the event schema is predefined.

The Optional column indicates whether a property may be missing from the event data after it is received and processed by Krenalis.

Property	Type	Optional	Description
`kpid`	`uuid`	✔	Krenalis Profile ID. Identifies the user profile associated with this event.
`connectionId`	`int(32)`		Identifier of the source connection from which the event was received. Set by Krenalis when the event is sent via an SDK or the API using an event write key.
`anonymousId`	`string`		Unique identifier assigned to a user before authentication, used to track anonymous activity across sessions. Set by the SDK or, if missing, by Krenalis.
`channel`	`string`	✔	Source channel through which the event was received (e.g., web, mobile, server).
`category`	`string`	✔	Used to group related pages or screens for analysis and reporting.
`context`	`object`	✔	Information about the environment where the event occurred (device, app/OS, page/screen, network, locale, campaign, library). Populated automatically when events are sent using the JavaScript SDK, the Android SDK or the iOS SDK.
`event`	`string`	✔	Name of the user action in a track event. Examples: Product Viewed, Order Completed. Not to be confused with the `name` property used in page or screen events.
`groupId`	`string`	✔	Identifier of the group (e.g., account, company, organization) associated with the user.
`messageId`	`string`		Unique, immutable identifier for the event. Set by the SDK; if omitted, Krenalis automatically assigns one.
`name`	`string`	✔	Title of the viewed page or screen in page and screen events. Not to be confused with the `event` property used in track events.
`properties`	`json`	✔	Key–value pairs describing contextual details about the event (e.g., product_id, revenue, rating). Distinct from `traits`, which describe user attributes.
`receivedAt`	`datetime`		UTC timestamp indicating when the event was received. Set by Krenalis.
`sentAt`	`datetime`		UTC timestamp indicating when the event was sent by the client. Set by the SDK and not reliable for analysis due to potential client clock drift; use `timestamp` for analytics.
`originalTimestamp`	`datetime`		UTC timestamp indicating when the event occurred on the client, in ISO 8601 format. Pass this property if the event occurred in the past. Not recommended for analysis due to possible clock drift; use `timestamp` instead.
`timestamp`	`datetime`		UTC timestamp indicating when the event occurred, in ISO 8601 format. Set by the SDK and adjusted by Krenalis. Suitable for analysis.
`traits`	`json`		Key–value pairs containing user information (e.g., name, email, plan).
`type`	`string`		Event type: one of page, screen, track, identify, group, or alias. Set by the SDK.
`previousId`	`string`	✔	User's previous identifier, passed to Krenalis but not used.
`userId`	`string`	✔	Unique identifier assigned to a user after authentication. If absent, the user is anonymous.

Context

Information about the environment where the event occurred. Populated automatically when events are sent using the JavaScript SDK, the Android SDK or the iOS SDK.

Property	Type	Optional	Description
`context.app`	`object`	✔	Information about the current application, including name, version, and build.
`context.browser`	`object`	✔	Information about the browser (name, version, type).
`context.campaign`	`object`	✔	Details about the campaign that originated the event, including name, source, medium, term, content, and custom UTM parameters.
`context.device`	`object`	✔	Information about the device, including ID, advertising ID, manufacturer, model, name, and type.
`context.ip`	`ip`	✔	User's current IP address. It is automatically set by the JavaScript SDK, the Android SDK and the iOS SDK. For more details see IP address.
`context.library`	`object`	✔	Information about the SDK library used to send the event, including name and version.
`context.locale`	`string`	✔	User's language and regional settings, such as `en-US`.
`context.location`	`object`	✔	Device location from which the event originated (city, country, latitude, longitude, speed).
`context.network`	`object`	✔	Network to which the device originating the event is connected. (Bluetooth, Wi-Fi, cellular, carrier). If both cellular and Wi-Fi are absent, the device is offline.
`context.os`	`object`	✔	OS of the device from which the event originated (name, version).
`context.page`	`object`	✔	Page information (path, referrer, title, URL).
`context.referrer`	`object`	✔	Referrer information (ID, type).
`context.screen`	`object`	✔	Display details (width, height, pixel density).
`context.session`	`object`	✔	Session details (ID, start flag).
`context.timezone`	`string`	✔	User's timezone as a tzdata string (e.g., `America/New_York`). May be unavailable due to privacy settings or lack of API support.
`context.userAgent`	`string`	✔	User agent string identifying the device or application sending the event.

App

Information about the current application.

Property	Type	Optional	Description
`context.app.name`	`string`	✔	Application name.
`context.app.version`	`string`	✔	Application version.
`context.app.build`	`string`	✔	Application build identifier.
`context.app.namespace`	`string`	✔	Application namespace or internal identifier.

Browser

Information about the browser.

Property	Type	Optional	Description
`context.browser.name`	`string`	✔	Browser name (e.g., Chrome, Safari, Firefox).
`context.browser.other`	`string`	✔	Custom or unrecognized browser name.
`context.browser.version`	`string`	✔	Browser version.

Campaign

Details about the campaign that originated the event.

Property	Type	Optional	Description
`context.campaign.name`	`string`	✔	Campaign name.
`context.campaign.source`	`string`	✔	Campaign source.
`context.campaign.medium`	`string`	✔	Campaign medium (e.g., email, social).
`context.campaign.term`	`string`	✔	Campaign keyword or term.
`context.campaign.content`	`string`	✔	Campaign content or variation.

Device

Information about the device. For iOS, note that model identifiers may differ from marketed names (e.g., iPhone16,2 for iPhone 15 Pro Max).

Property	Type	Optional	Description
`context.device.id`	`string`	✔	Device identifier.
`context.device.advertisingId`	`string`	✔	Advertising identifier.
`context.device.adTrackingEnabled`	`boolean`	✔	Indicates whether ad tracking is enabled.
`context.device.manufacturer`	`string`	✔	Device manufacturer.
`context.device.model`	`string`	✔	Device model.
`context.device.name`	`string`	✔	Device name.
`context.device.type`	`string`	✔	Device type (e.g., mobile, desktop).
`context.device.token`	`string`	✔	Unique device token.

Library

Information about the SDK library used to send the event.

Property	Type	Optional	Description
`context.library.name`	`string`	✔	Name of the analytics library.
`context.library.version`	`string`	✔	Version of the analytics library.

Location

The device location from which the event originated.

Property	Type	Optional	Description
`context.location.city`	`string`	✔	City.
`context.location.country`	`string`	✔	Country.
`context.location.latitude`	`float(64)`	✔	Latitude.
`context.location.longitude`	`float(64)`	✔	Longitude.
`context.location.speed`	`float(64)`	✔	Speed at which the device is moving, in meters per second.

Network

The network to which the device originating the event is connected. If both cellular and wifi are absent, the device is offline.

Property	Type	Optional	Description
`context.network.bluetooth`	`boolean`	✔	Indicates whether Bluetooth is active.
`context.network.carrier`	`string`	✔	Mobile network carrier name.
`context.network.cellular`	`boolean`	✔	Indicates whether a cellular connection is active.
`context.network.wifi`	`boolean`	✔	Indicates whether Wi-Fi is active.

OS

OS of the device from which the event originated

Property	Type	Optional	Description
`context.os.name`	`string`	✔	Operating system name (e.g., Android, iOS, Windows).
`context.os.other`	`string`	✔	Unrecognized operating system name.
`context.os.version`	`string`	✔	Operating system version.

Page

Page information.

Property	Type	Optional	Description
`context.page.path`	`string`	✔	Page path.
`context.page.referrer`	`string`	✔	Referring URL.
`context.page.search`	`string`	✔	URL search parameters.
`context.page.title`	`string`	✔	Page title.
`context.page.url`	`string`	✔	Full page URL.

Referrer

Referrer information.

Property	Type	Optional	Description
`context.referrer.id`	`string`	✔	Referrer source identifier.
`context.referrer.type`	`string`	✔	Referrer source type.

Screen

Display details.

Property	Type	Optional	Description
`context.screen.width`	`int(16)`	✔	Screen width in pixels.
`context.screen.height`	`int(16)`	✔	Screen height in pixels.
`context.screen.density`	`decimal(3,2)`	✔	Screen pixel ratio.

Session

Session details. See also Session tracking.

Property	Type	Optional	Description
`context.session.id`	`int(64)`	✔	Unique session identifier.
`context.session.start`	`boolean`	✔	Indicates whether the event starts a session.