Batch Metadata & Relations

Batch document metadata: PATCH /v3/collections/{collection_name}/documents/metadata/batch merges custom metadata into up to 100 documents at once; PUT replaces each document’s whole object.
Batch chunk metadata: the same two operations on chunks: PATCH and PUT /v3/collections/{collection_name}/chunks/metadata/batch.
Batch chunk relations: PUT /v3/collections/{collection_name}/relations/batch creates or updates up to 100 relations, matched by source, target and relation_type.
One result per item: a 200 carries succeeded, failed or unknown per item in request order; a failed item never rolls back the others.
Envelope, partial success and limits: Batch Metadata & Relations. Over MCP: captain_batch_document_metadata, captain_batch_chunk_metadata, captain_batch_chunk_relations.