Event
constructor(id: UUID, sessionId: UUID, pluginId: String, type: String, timestampEpochMs: Long, monotonicNanos: Long, sequence: Long, severity: EventSeverity, summary: String, correlationId: String? = null, tags: Map<String, String> = emptyMap(), payloadRef: String? = null, schemaVersion: Int = CURRENT_SCHEMA_VERSION)