import { type ChatMutation } from "./chatMutation.js";
import { type DrizzleTransaction } from "../../drizzle.js";
type ChannelServiceType = "user_added" | "user_joined" | "user_left" | "user_kicked" | "channel_archived";
/**
 * Inserts one durable channel-lifecycle notice from the default agent in the same transaction as the action it explains.
 * The structured service payload identifies the affected user while the stored text remains useful to clients that only render ordinary automated messages.
 */
export declare function createChannelServiceMessageDb(tx: DrizzleTransaction, input: {
    sequence: number;
    chatId: string;
    userId: string;
    type: ChannelServiceType;
    username?: string;
    defaultAgentUserId?: string;
}): Promise<ChatMutation & {
    messageSequence?: number;
}>;
export {};
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