post:
  tags:
    - Knowledge
  summary: Knowledge graph core management
  description: |
    Manage knowledge graph cores - persistent storage of triples and embeddings.

    ## Knowledge Cores

    Knowledge cores are the foundational storage units for:
    - **Triples**: RDF triples representing knowledge graph data
    - **Graph Embeddings**: Vector embeddings for entities
    - **Metadata**: Descriptive information about the knowledge

    Each core has an ID, user, and collection for organization.

    ## Operations

    ### list-kg-cores
    List all knowledge cores for a user. Returns array of core IDs.

    ### get-kg-core
    Retrieve a knowledge core by ID. Returns triples and/or graph embeddings.
    Response is streamed - may receive multiple messages followed by EOS marker.

    ### put-kg-core
    Store triples and/or graph embeddings. Creates new core or updates existing.
    Can store triples only, embeddings only, or both together.

    ### delete-kg-core
    Delete a knowledge core by ID. Removes all associated data.

    ### load-kg-core
    Load a knowledge core into a running flow's collection.
    Makes the data available for querying within that flow instance.

    ### unload-kg-core
    Unload a knowledge core from a flow's collection.
    Removes data from flow instance but doesn't delete the core.

    ## Streaming Responses

    The `get-kg-core` operation streams data in chunks:
    1. Multiple messages with `triples` or `graph-embeddings`
    2. Final message with `eos: true` to signal completion

  operationId: knowledgeService
  security:
    - bearerAuth: []
  requestBody:
    required: true
    content:
      application/json:
        schema:
          $ref: '../components/schemas/knowledge/KnowledgeRequest.yaml'
        examples:
          listKnowledgeCores:
            summary: List knowledge cores
            value:
              operation: list-kg-cores
              user: alice
          getKnowledgeCore:
            summary: Get knowledge core
            value:
              operation: get-kg-core
              id: core-123
          putTriplesOnly:
            summary: Store triples
            value:
              operation: put-kg-core
              triples:
                metadata:
                  id: core-123
                  user: alice
                  collection: default
                  metadata:
                    - s: {v: "https://example.com/core-123", e: true}
                      p: {v: "https://www.w3.org/1999/02/22-rdf-syntax-ns#type", e: true}
                      o: {v: "https://trustgraph.ai/e/knowledge-core", e: true}
                triples:
                  - s: {v: "https://example.com/entity1", e: true}
                    p: {v: "https://www.w3.org/2000/01/rdf-schema#label", e: true}
                    o: {v: "Entity 1", e: false}
                  - s: {v: "https://example.com/entity1", e: true}
                    p: {v: "https://example.com/relatedTo", e: true}
                    o: {v: "https://example.com/entity2", e: true}
          putEmbeddingsOnly:
            summary: Store embeddings
            value:
              operation: put-kg-core
              graph-embeddings:
                metadata:
                  id: core-123
                  user: alice
                  collection: default
                  metadata: []
                entities:
                  - entity: {v: "https://example.com/entity1", e: true}
                    vectors: [0.1, 0.2, 0.3, 0.4, 0.5]
                  - entity: {v: "https://example.com/entity2", e: true}
                    vectors: [0.6, 0.7, 0.8, 0.9, 1.0]
          putTriplesAndEmbeddings:
            summary: Store triples and embeddings together
            value:
              operation: put-kg-core
              triples:
                metadata:
                  id: core-456
                  user: bob
                  collection: research
                  metadata: []
                triples:
                  - s: {v: "https://example.com/doc1", e: true}
                    p: {v: "http://purl.org/dc/terms/title", e: true}
                    o: {v: "Research Paper", e: false}
              graph-embeddings:
                metadata:
                  id: core-456
                  user: bob
                  collection: research
                  metadata: []
                entities:
                  - entity: {v: "https://example.com/doc1", e: true}
                    vectors: [0.11, 0.22, 0.33]
          deleteKnowledgeCore:
            summary: Delete knowledge core
            value:
              operation: delete-kg-core
              id: core-123
              user: alice
          loadKnowledgeCore:
            summary: Load core into flow
            value:
              operation: load-kg-core
              id: core-123
              flow: my-flow
              collection: default
          unloadKnowledgeCore:
            summary: Unload core from flow
            value:
              operation: unload-kg-core
              id: core-123
  responses:
    '200':
      description: Successful response
      content:
        application/json:
          schema:
            $ref: '../components/schemas/knowledge/KnowledgeResponse.yaml'
          examples:
            listKnowledgeCores:
              summary: List of knowledge cores
              value:
                ids:
                  - core-123
                  - core-456
                  - core-789
            getKnowledgeCoreTriples:
              summary: Knowledge core triples (streaming)
              value:
                triples:
                  metadata:
                    id: core-123
                    user: alice
                    collection: default
                    metadata:
                      - s: {v: "https://example.com/core-123", e: true}
                        p: {v: "https://www.w3.org/1999/02/22-rdf-syntax-ns#type", e: true}
                        o: {v: "https://trustgraph.ai/e/knowledge-core", e: true}
                  triples:
                    - s: {v: "https://example.com/entity1", e: true}
                      p: {v: "https://www.w3.org/2000/01/rdf-schema#label", e: true}
                      o: {v: "Entity 1", e: false}
            getKnowledgeCoreEmbeddings:
              summary: Knowledge core embeddings (streaming)
              value:
                graph-embeddings:
                  metadata:
                    id: core-123
                    user: alice
                    collection: default
                    metadata: []
                  entities:
                    - entity: {v: "https://example.com/entity1", e: true}
                      vectors: [0.1, 0.2, 0.3, 0.4, 0.5]
            endOfStream:
              summary: End of stream marker
              value:
                eos: true
            deleteSuccess:
              summary: Delete successful (empty response)
              value: {}
    '401':
      $ref: '../components/responses/Unauthorized.yaml'
    '500':
      $ref: '../components/responses/Error.yaml'