-- Phase 2A (embedding-phase2a-1 E-1): 후보 임베딩 chunks 섀도 테이블 (eval 전용, 단일 statement).
CREATE TABLE IF NOT EXISTS document_chunks_cand_qwen4m (
    id BIGINT PRIMARY KEY,
    doc_id BIGINT NOT NULL,
    chunk_index INTEGER,
    section_title TEXT,
    text TEXT,
    embedding vector(1024) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);