{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://oracle.com/schemas/database/event-message.json",
  "title": "Oracle Transactional Event Queue Message",
  "description": "Represents a message in Oracle Transactional Event Queues (TxEventQ), the Kafka-compatible event streaming system built into Oracle Database.",
  "type": "object",
  "properties": {
    "key": {
      "type": ["string", "null"],
      "description": "Message key used for partition assignment and ordering guarantees"
    },
    "value": {
      "description": "The message payload content, can be any JSON value"
    },
    "headers": {
      "type": "object",
      "description": "Optional message headers for metadata and routing",
      "additionalProperties": {
        "type": "string"
      }
    },
    "topic": {
      "type": "string",
      "description": "Name of the TxEventQ topic"
    },
    "partition": {
      "type": "integer",
      "description": "Partition number within the topic",
      "minimum": 0
    },
    "offset": {
      "type": "integer",
      "format": "int64",
      "description": "Sequential offset of the message within its partition",
      "minimum": 0
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the message was produced or appended"
    },
    "timestampType": {
      "type": "string",
      "description": "Type of timestamp",
      "enum": ["CREATE_TIME", "LOG_APPEND_TIME"]
    }
  },
  "required": ["value"]
}