GraphlessDB is an open source serverless graph database built upon AWS DynamoDB.

GraphlessDB is organized into a clean layered architecture with clear separation of concerns and one-way dependencies:

Core utilities and extensions with no domain dependencies:

• Collections (immutable lists, dictionaries, trees)
• Threading utilities (retry, lock)
• LINQ extensions

Storage contracts and models:

• RDF triple models and predicates
• Storage interfaces (IRDFTripleStore, IMemoryCache)
• Request/response DTOs
• Base exceptions

Pluggable storage providers (each in separate project):

• GraphlessDB.Storage.InMemory - In-memory storage for development/testing
• GraphlessDB.Storage.FileBased - File-based persistence
• GraphlessDB.DynamoDB - Production-grade AWS DynamoDB backend with optional transactions

Graph-specific domain logic:

• Domain models (INode, IEdge)
• Cursor types for pagination
• Graph services (partitioning, serialization, schema)
• Domain exceptions

Query execution layer:

• Query models and filters
• Query execution services
• Connection queries (fluent API)
• Graph query executors

Clean public-facing API:

• IGraphDB and GraphDB main interfaces
• Dependency injection extensions
• Service registration

GraphlessDB (Public API)
    └── GraphlessDB.Query
        └── GraphlessDB.Domain
            └── GraphlessDB.Storage ← GraphlessDB.Storage.InMemory
                └── GraphlessDB.Core  ← GraphlessDB.Storage.FileBased
                                      ← GraphlessDB.DynamoDB

All dependencies flow downward (one-way), ensuring clean separation and easy testability.