export type ChatSessionId = string
export type ChatMessageId = string

export interface ChatSession {
  id: ChatSessionId
  subject: string
  create_at: number
  messages: ChatMessage[]
}

export type MessageRole = 'user' | 'assistant' | 'system'

export interface ChatMessage {
  id: ChatMessageId
  role: MessageRole
  content: string
  create_at: number
  interrupted?: boolean
}