Public API Overview

Public API overview

4.0 release review — September 10, 2026. The documented published candidate is 4.0.0-RC.2. Final 4.0.0 is not yet published. See QQQ 4.0 for scope and acceptance gates.

Use the classes and interfaces in the selected source revision. Earlier versions of this wiki contained illustrative signatures that did not match the implementation; those snippets have been removed.

Topic	Current reference
Tables and fields	Table guide
Java backend steps	Process guide
Apps and dashboard	App guide
Record entities and annotations	Annotation reference
Backend SPI	Backend extensions
HTTP/API integration	API reference
Configuration	Configuration reference
Breaking APIs and migration	QQQ 4.0

QTableMetaData and QProcessMetaData are classes, not annotations. QRecord is a class; typed record entities extend QRecordEntity. A BackendStep implements void run(RunBackendStepInput, RunBackendStepOutput). QContext must be initialized appropriately and cleared after a manually managed scope.

A core dependency alone does not install an HTTP contract or create an application. Follow the sample server or your application's middleware setup. Automatic GraphQL generation is outside the verified 4.0 scope. Use QLogger and the actual logPair helper contract for structured values; inspect source imports rather than copying invented overloads.