-- persons 表：补齐首页置顶与来源字段（兼容低版本 MySQL 的幂等写法）
SET @db = DATABASE();

SET @sql = (
  SELECT IF(
    EXISTS(
      SELECT 1 FROM information_schema.COLUMNS
      WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'persons' AND COLUMN_NAME = 'is_pinned'
    ),
    'SELECT 1',
    "ALTER TABLE persons ADD COLUMN is_pinned TINYINT(1) NOT NULL DEFAULT 0 COMMENT '置顶到小程序首页'"
  )
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @sql = (
  SELECT IF(
    EXISTS(
      SELECT 1 FROM information_schema.COLUMNS
      WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'persons' AND COLUMN_NAME = 'person_source'
    ),
    'SELECT 1',
    "ALTER TABLE persons ADD COLUMN person_source VARCHAR(32) NOT NULL DEFAULT '' COMMENT '来源：空=后台手工；vip_sync=超级个体同步'"
  )
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @sql = (
  SELECT IF(
    EXISTS(
      SELECT 1 FROM information_schema.STATISTICS
      WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'persons' AND INDEX_NAME = 'idx_persons_is_pinned'
    ),
    'SELECT 1',
    'CREATE INDEX idx_persons_is_pinned ON persons(is_pinned)'
  )
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;