Event Schema

The Jade Platform Event Stream Producer (ESP) uses a JSON schema to describe database state change events. For details about the JSON schema specification, see https://json-schema.org/specification.

The JSON schema defines the structure for describing database change events in a Jade Platform database. It serves as a template for generating valid JSON payloads that represent these events.

The schema is composed of the following key components.

1. Root‑level properties

2. Definitions section, which contains nested schemas

Root-Level Properties

The following table lists the root‑level properties in the JSON schema.

Property	Description
$schema	Specifies the JSON schema draft version; for example, "http://json-schema.org/draft-07/schema#"
title	Provides a human‑readable title for the schema
type	Defines the root‑level object type
properties	Lists all of the properties of the root object
required	Specifies which properties are mandatory

The following table lists details of the properties property.

properties Detail	Description
eventId	String type
schemaId	String type
eventType	String type
eventTime	String type with date-time format
eventTimezoneOffset	String type
eventSequenceNumber	Integer type
contentType	String type
transactionId	Integer type
objectType	String type
object	Object type referencing another schema

Definitions Section

The "definitions" section of the JSON schema contains nested schemas for complex types.

Object Definition

The "Object" defines the structure of the main event payload object.

ObjectReference Definition

The "ObjectReference" defines the structure for referencing other objects.

Constraints

The following constraints apply to the JSON schema.

• Uses JSON Schema draft-07 standard

• Implements recursive references using $ref

• Applies type definitions and constraints to each property

The following is an example of a JSON schema.

{
    "$schema": "<http://json-schema.org/draft-07/schema#>",
    "title": "BankModelSchema.Account.v1",
    "type": "object",
    "properties": {
    // ... properties definitions ...  
    },
    "required": ["eventId", "schemaId", "eventType", "eventTime",
          "eventTimezoneOffset", "eventSequenceNumber", "contentType", 
          "transactionId", "objectType", "object"],
    "definitions": {
        "Object": {
        // ... Object definition ...
    },
    "ObjectReference": {
        // ... ObjectReference definition ...
       }
    }
}