Files
CamTalk/backend/migrations/003_sessions.up.sql
hhs 74f1a8eb34 refactor: 优化数据库迁移文件约束和注释
**迁移文件优化**:
- 001_users.up.sql: 添加完整表和列注释,说明密码哈希算法 (bcrypt) 和 token 哈希算法 (SHA-256)
- 002_messages.up.sql: 收紧 role 字段至 VARCHAR(10),添加 tokens_used 非负约束,补充完整注释
- 003_sessions.up.sql: 收紧 title 字段至 VARCHAR(100) 并添加长度约束 (1-100),详细说明 config JSONB 结构
- 004_user_scenarios.up.sql: 修复 greeting 字段冲突 (VARCHAR(500)),扩大 icon 至 VARCHAR(20) 支持复合 Emoji,prompt 改为 TEXT 无上限,优化约束逻辑

**后端代码修改**:
- auth.go: 移除用户名最小长度限制 (3 字符),仅保留最大长度 64

**前端国际化修改**:
- 更新三种语言的登录/注册表单 placeholder 文本,移除字符长度要求提示
  - zh-CN: "请输入用户名" / "请输入密码"
  - en-US: "Enter username" / "Enter password"
  - ja-JP: "ユーザー名を入力" / "パスワードを入力"

**删除文件**:
- 移除临时修复迁移文件 (005_fix_user_scenarios_description.*)
- 删除临时诊断脚本 (fix_user_scenarios.sql, check_constraints.sql)

所有约束修改都是放宽限制,不影响现有数据。
2026-06-23 23:41:49 +08:00

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CREATE TABLE IF NOT EXISTS sessions (
id UUID PRIMARY KEY,
user_id UUID NOT NULL,
title VARCHAR(100) NOT NULL DEFAULT '新对话',
config JSONB NOT NULL DEFAULT '{}',
created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
CONSTRAINT check_title_length CHECK (char_length(title) >= 1 AND char_length(title) <= 100)
);
CREATE INDEX IF NOT EXISTS idx_sessions_user_id ON sessions (user_id);
CREATE INDEX IF NOT EXISTS idx_sessions_user_updated ON sessions (user_id, updated_at DESC);
-- 表和列注释
COMMENT ON TABLE sessions IS '会话表,存储用户的对话会话信息';
COMMENT ON COLUMN sessions.id IS '会话唯一标识符 (UUID)';
COMMENT ON COLUMN sessions.user_id IS '所属用户 ID关联 users 表';
COMMENT ON COLUMN sessions.title IS '会话标题,默认为"新对话",长度 1-100 字符';
COMMENT ON COLUMN sessions.config IS '会话配置 (JSONB),包含: tts_enabled (布尔), detail_level (''low''/''high''), language (语言代码), scenario (情景 ID)';
COMMENT ON COLUMN sessions.created_at IS '会话创建时间';
COMMENT ON COLUMN sessions.updated_at IS '会话最后更新时间';