Struct MultimodalContextSchema 

pub struct MultimodalContextSchema;

Marker struct for multimodal LLM-context tables. Actual schema is enforced by column names in multimodal_columns module.

A multimodal table combines all llm_columns::* fields (text + embeddings) with multimodal_columns::* (media URI, MIME, caption, image_embedding, audio_transcript, thumbnail_b64).

Example Arrow schema (abridged):

chunk_id:          Utf8
chunk_text:        Utf8
embedding:         FixedSizeBinary(3072)   -- text, F16, dim=1536
image_embedding:   FixedSizeBinary(1024)   -- image, F16, dim=512
media_uri:         Utf8
media_mime:        Utf8
media_caption:     Utf8
audio_transcript:  Utf8
thumbnail_b64:     Utf8