Dgraph

Dgraph serves as the graph database for the Context Graph and Ontology Service, storing semantic relationships, SHACL shapes, and domain ontologies.

Architecture

+----------------+     +------------------+
| Dgraph Zero    |     | Dgraph Alpha     |
| (Coordination) |---->| (Data storage)   |
| Port: 5080     |     | Port: 9080, 8080 |
+----------------+     +------------------+
                               |
                        +------+------+
                        | Dgraph Ratel |
                        | (Web UI)     |
                        | Port: 8000   |
                        +-------------+

Components

Component	Purpose	Ports
Zero	Cluster coordination, shard management	5080 (internal), 6080 (HTTP)
Alpha	Data storage, query execution	9080 (gRPC), 8080 (HTTP)
Ratel	Web-based graph visualization	8000

Use Cases

Use Case	Consumer
Domain ontology storage	Ontology Service
SHACL shape validation	Context Graph
Semantic relationship queries	AI Service
Entity resolution	Catalog Service

Spark Qdrant