Add CLAUDE.md guidance file

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What this is
+
+Hades ([product page](https://www.codbex.com/products/)) is the database-administration product in the codbex suite — a database-management distribution built on top of [Eclipse Dirigible](https://github.com/eclipse/dirigible). It targets PostgreSQL, MySQL, SAP HANA, H2, and more, providing a Database Explorer, SQL Console, Data Transfer, Data Import/Export, and Anonymization tools. It bundles Dirigible's database, CMS, UI-shell, and security components into a single Spring Boot application.
+
+This repo contains **almost no business logic of its own** — it is primarily an assembly/packaging project. The actual functionality lives in the `org.eclipse.dirigible:dirigible-components-*` dependencies (and the parent `com.codbex.platform:codbex-platform-parent`). When investigating behavior, expect to read into the Dirigible dependency JARs rather than this repo's source.
+
+## Build & run
+
+Java 17 is required to build; the Docker image runs on Corretto 21. Maven build profiles are inherited from the `codbex-platform-parent` POM.
+
+```bash
+# Fast build, skips tests/checks (produces application/target/codbex-hades-*.jar)
+mvn -T 1C clean install -P quick-build
+
+# Run the standalone jar (the --add-opens flags are required)
+java --add-opens=java.base/java.lang=ALL-UNNAMED \
+     --add-opens=java.base/java.lang.reflect=ALL-UNNAMED \
+     --add-opens=java.base/java.nio=ALL-UNNAMED \
+     -jar application/target/codbex-hades-*.jar
+# Debug on port 8000: add -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000
+```
+
+App serves on **http://localhost:80** (default login `admin` / `admin`). REST API / Swagger UI at `http://localhost/swagger-ui/index.html`.
+
+## Tests
+
+```bash
+mvn clean install -P unit-tests          # unit tests only
+mvn clean install -P integration-tests   # Selenium/browser integration tests (integration-tests module)
+mvn clean install -P tests               # all tests
+```
+
+Integration tests (`*IT.java`) extend `HadesIntegrationTest` → Dirigible's `UserInterfaceIntegrationTest`, which drives a browser (`ide`, `browser` helpers). They boot the full application. Run a single IT with `mvn -P integration-tests -pl integration-tests -Dit.test=HomePageIT verify`.
+
+## Formatting
+
+```bash
+mvn verify -P format   # applies the codbex-formatter.xml Eclipse formatter + license headers
+```
+
+Every Java file carries the EPL-2.0 license header (see existing files); the format profile enforces it.
+
+## Module layout
+
+- `application/` — the Spring Boot entry point (`HadesApplication`) and the master dependency list selecting which Dirigible components are bundled. `application/pom.xml` is where you add/remove product features (database UI views, security providers, CMS engines, etc.). Also contains the `Dockerfile`.
+- `branding/` — product branding resources (logo, favicon, `project.json`) packaged as a Dirigible content module under `META-INF/dirigible/`.
+- `components/ui/menu-help/` — the one custom UI component in this repo: a Dirigible "Help" menu contribution (extensions + translations under `META-INF/dirigible/`). Pattern to follow when adding new UI menu items.
+- `integration-tests/` — browser-based integration tests; no production code.
+- `helm/` — Helm chart for Kubernetes deployment.
+
+## Architecture notes
+
+- `HadesApplication` is a `@SpringBootApplication` that scans `org.eclipse.dirigible` and **excludes** Spring Boot's datasource/JPA auto-configuration — Dirigible manages its own datasources and persistence. Don't re-enable those auto-configurations.
+- Spring profiles: Dirigible requires `common` and `app-default` to be active (set by default in `application.properties` via `spring.profiles.active=common,app-default`). Additional providers are activated by adding profiles, e.g. `SPRING_PROFILES_ACTIVE=common,snowflake,app-default`.
+- Custom datasources and runtime tuning are configured via environment variables / Spring properties, not code — see README's "Configuration Options" (e.g. `DIRIGIBLE_DATABASE_CUSTOM_DATASOURCES`, `MYDB1_DRIVER`/`URL`/`USERNAME`/`PASSWORD` with base64-encoded credentials).
+- Dirigible content modules (branding, menu-help) are contributed by placing resources under `src/main/resources/META-INF/dirigible/<name>/` with a `project.json`; they are discovered on the classpath at runtime, not wired in Java.
+
+## Versioning / release
+
+`-SNAPSHOT` versions are for development; release commits bump to a fixed version across the POMs and the Helm chart together (see git history). Version is set in the root `pom.xml` and propagated to modules.