-- PR-DocSrv-LargeDoc-Split-Markdown-1 (commit 1: schema)
-- 통합 schema: LargeDoc(page_start/end) + Phase 3A(source_type/chunker_version/source_hash/chunk_content_hash) 선반영.
-- Phase 3A 세션은 이 컬럼 위에서 동작 (schema 미터치). 분담 plan: brisk-paging-quokka.md
ALTER TABLE document_chunks
  ADD COLUMN IF NOT EXISTS page_start integer,
  ADD COLUMN IF NOT EXISTS page_end integer,
  ADD COLUMN IF NOT EXISTS source_type text,
  ADD COLUMN IF NOT EXISTS chunker_version text,
  ADD COLUMN IF NOT EXISTS source_hash text,
  ADD COLUMN IF NOT EXISTS chunk_content_hash text;