-- ===========================================
-- 迁移: file-service files 表添加 tenant_id
-- 日期: 2026-02-07
-- ===========================================

-- 默认租户 ID
DO $$
DECLARE
  default_tenant UUID := '00000000-0000-0000-0000-000000000001';
BEGIN
  -- 1. 添加 tenant_id 列（如果不存在）
  IF NOT EXISTS (
    SELECT 1 FROM information_schema.columns
    WHERE table_name = 'files' AND column_name = 'tenant_id'
  ) THEN
    ALTER TABLE files ADD COLUMN tenant_id UUID NOT NULL DEFAULT default_tenant;
    RAISE NOTICE 'Added tenant_id column to files table';
  ELSE
    RAISE NOTICE 'tenant_id column already exists in files table';
  END IF;

  -- 2. 回填现有记录
  UPDATE files SET tenant_id = default_tenant WHERE tenant_id IS NULL;

  -- 3. 创建索引（如果不存在）
  IF NOT EXISTS (
    SELECT 1 FROM pg_indexes WHERE indexname = 'idx_files_tenant_id'
  ) THEN
    CREATE INDEX idx_files_tenant_id ON files(tenant_id);
    RAISE NOTICE 'Created index idx_files_tenant_id';
  END IF;

  IF NOT EXISTS (
    SELECT 1 FROM pg_indexes WHERE indexname = 'idx_files_tenant'
  ) THEN
    CREATE INDEX idx_files_tenant ON files(tenant_id);
    RAISE NOTICE 'Created index idx_files_tenant';
  END IF;

  IF NOT EXISTS (
    SELECT 1 FROM pg_indexes WHERE indexname = 'idx_files_tenant_user'
  ) THEN
    CREATE INDEX idx_files_tenant_user ON files(tenant_id, user_id);
    RAISE NOTICE 'Created index idx_files_tenant_user';
  END IF;
END $$;