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+# Project Overview
+
+## Purpose
+
+The Romexis Docker project provides a reproducible Docker-based environment for running Planmeca Romexis Server on Linux.
+
+The project is designed to:
+
+- run Romexis Server in containers
+- keep runtime configuration externalized
+- avoid manual Windows-style setup steps
+- support persistent application and database data
+- support migration from existing installations
+- support repeatable CI/CD builds
+- prepare a path for both Microsoft SQL Server and Firebird database backends
+
+---
+
+## Design Principles
+
+### No Romexis binaries in Git
+
+The repository does not contain Romexis application binaries.
+
+Instead, the build process downloads official installer packages and extracts only the required server components into payload images.
+
+### Layered image architecture
+
+The build system is split into reusable layers:
+
+```text
+Payload image
+  Contains extracted Romexis application files and SQL payload.
+
+Base image
+  Contains reusable runtime dependencies such as Java, JavaFX and database tools.
+
+Server image
+  Combines payload + base + runtime scripts + Java agent.
+```
+
+This keeps individual images easier to maintain and avoids repeated installer downloads when the payload already exists.
+
+### Architecture-independent payloads
+
+The Romexis payload itself is architecture independent. Architecture-specific parts such as Chilkat native libraries remain in the final server image.
+
+This allows the same payload to be reused for both:
+
+```text
+linux/amd64
+linux/arm64
+```
+
+### Database backend flexibility
+
+Microsoft SQL Server remains the default backend.
+
+Firebird support is being added in parallel because macOS-based Romexis installations use Firebird and because this path is more realistic for ARM64 environments.
+
+---
+
+## Main Features
+
+- Romexis Server 6.5 Docker runtime
+- Microsoft SQL Server 2022 support
+- Firebird backend preparation
+- automatic database initialization
+- persistent runtime volumes
+- Java Property Agent for runtime property injection
+- versioned payload images
+- multi-architecture base and server images
+- Drone CI/CD pipeline
+- migration service with Web UI, REST API and SFTP
+- Windows migration client
+- Gitea package registry publishing
+
+---
+
+## Supported Platforms
+
+| Platform | Status |
+|---|---|
+| linux/amd64 | Primary supported target |
+| linux/arm64 | Supported for Romexis runtime images |
+| Microsoft SQL Server on amd64 | Default backend |
+| Firebird on amd64/arm64 | In progress / experimental |
+| macOS source migrations | Planned through Firebird and client workflow |
+
+---
+
+## Repository Areas
+
+```text
+romexis-base/
+  Reusable runtime base image.
+
+romexis-payload/
+  Windows installer payload extraction.
+
+romexis-firebird-payload/
+  macOS installer Firebird SQL payload extraction.
+
+romexis/
+  Final Romexis Server image.
+
+migration-service/
+  Migration orchestration service.
+
+migration-client/
+  Migration helper client.
+
+docs/
+  Extended documentation.
+
+docker-compose.yml
+  Default runtime stack.
+
+docker-compose.firebird.yml
+  Firebird runtime variant.
+
+.drone.yml
+  CI/CD pipeline.
+```