-- ECR-023 AICoreConfig KnowledgeSource (read catalog)

CREATE TABLE IF NOT EXISTS knowledge_sources (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  code varchar(64) NOT NULL UNIQUE,
  title varchar(128) NOT NULL,
  description text NULL,
  source_kind varchar(32) NOT NULL
    CHECK (source_kind IN ('faq', 'policy', 'guide')),
  version int NOT NULL DEFAULT 1 CHECK (version > 0),
  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_sources_active ON knowledge_sources(active);

INSERT INTO knowledge_sources(code, title, description, source_kind, version, active, system)
VALUES (
  'ask_grounding',
  '问答 grounding 知识源',
  '运营可观测的 Ask grounding 目录占位；本切片不含 KnowledgeChunk。',
  'faq',
  1,
  true,
  true
)
ON CONFLICT (code) DO NOTHING;