-- 文件中心独占数据库，其他服务只保存文件逻辑ID。
CREATE DATABASE IF NOT EXISTS baiyue_file
  DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
USE baiyue_file;

CREATE TABLE IF NOT EXISTS file_object (
  id BIGINT UNSIGNED NOT NULL COMMENT '文件ID（雪花ID）',
  tenant_id BIGINT UNSIGNED NOT NULL COMMENT '数据所属租户ID',
  business_type VARCHAR(32) NULL COMMENT '关联业务类型',
  business_id VARCHAR(64) NULL COMMENT '关联业务逻辑ID',
  original_name VARCHAR(255) NOT NULL COMMENT '原始文件名',
  object_key VARCHAR(512) NOT NULL COMMENT '对象存储键',
  storage_provider VARCHAR(32) NOT NULL COMMENT '存储提供方',
  bucket_name VARCHAR(128) NOT NULL COMMENT '存储桶名称',
  content_type VARCHAR(128) NOT NULL COMMENT '文件内容类型',
  size_bytes BIGINT UNSIGNED NOT NULL COMMENT '文件字节数',
  sha256 CHAR(64) NULL COMMENT '文件SHA-256摘要',
  status VARCHAR(24) NOT NULL DEFAULT 'ACTIVE' COMMENT '文件状态',
  created_by BIGINT UNSIGNED NOT NULL COMMENT '创建人ID',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '创建时间',
  updated_by BIGINT UNSIGNED NOT NULL COMMENT '最后修改人ID',
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3) COMMENT '更新时间',
  deleted TINYINT(1) NOT NULL DEFAULT 0 COMMENT '逻辑删除标记',
  version INT NOT NULL DEFAULT 0 COMMENT '乐观锁版本号',
  PRIMARY KEY (id),
  UNIQUE KEY uk_file_tenant_object (tenant_id, object_key),
  KEY idx_file_tenant_business (tenant_id, business_type, business_id),
  KEY idx_file_tenant_created (tenant_id, created_at)
) ENGINE=InnoDB COMMENT='文件元数据表';

CREATE TABLE IF NOT EXISTS file_download_token (
  id BIGINT UNSIGNED NOT NULL COMMENT '下载令牌ID',
  tenant_id BIGINT UNSIGNED NOT NULL COMMENT '数据所属租户ID',
  file_id BIGINT UNSIGNED NOT NULL COMMENT '文件逻辑ID',
  token_hash CHAR(64) NOT NULL COMMENT '下载令牌SHA-256摘要',
  expires_at DATETIME(3) NOT NULL COMMENT '过期时间',
  max_downloads INT UNSIGNED NOT NULL DEFAULT 1 COMMENT '最大下载次数',
  download_count INT UNSIGNED NOT NULL DEFAULT 0 COMMENT '已下载次数',
  revoked_at DATETIME(3) NULL COMMENT '撤销时间',
  created_by BIGINT UNSIGNED NOT NULL COMMENT '创建人ID',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '创建时间',
  PRIMARY KEY (id),
  UNIQUE KEY uk_download_token_hash (token_hash),
  KEY idx_download_file (tenant_id, file_id),
  KEY idx_download_expiry (expires_at)
) ENGINE=InnoDB COMMENT='临时下载授权令牌表';

CREATE TABLE IF NOT EXISTS file_download_log (
  id BIGINT UNSIGNED NOT NULL COMMENT '下载日志ID',
  tenant_id BIGINT UNSIGNED NOT NULL COMMENT '数据所属租户ID',
  file_id BIGINT UNSIGNED NOT NULL COMMENT '文件逻辑ID',
  user_id BIGINT UNSIGNED NULL COMMENT '下载用户ID',
  request_id VARCHAR(64) NULL COMMENT '请求ID',
  client_ip VARCHAR(64) NULL COMMENT '客户端IP',
  result VARCHAR(16) NOT NULL COMMENT '下载结果',
  failure_reason VARCHAR(500) NULL COMMENT '失败原因',
  downloaded_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '下载时间',
  PRIMARY KEY (id),
  KEY idx_download_log_file (tenant_id, file_id, downloaded_at),
  KEY idx_download_log_user (tenant_id, user_id, downloaded_at)
) ENGINE=InnoDB COMMENT='文件下载审计日志表';