-- ECR-027 KnowledgeChunk (read catalog)

CREATE TABLE IF NOT EXISTS knowledge_chunks (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  code varchar(64) NOT NULL UNIQUE,
  source_code varchar(64) NOT NULL,
  title varchar(128) NOT NULL,
  body text NOT NULL,
  active boolean NOT NULL DEFAULT true,
  system boolean NOT NULL DEFAULT false,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_knowledge_chunks_active ON knowledge_chunks(active);

INSERT INTO knowledge_chunks(code, source_code, title, body, active, system)
VALUES ('ask_grounding_intro', 'ask_grounding', '问答 grounding 引言块', '愈心谷提供陪伴式成长对话，非医疗诊断。', true, true)
ON CONFLICT (code) DO NOTHING;