import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Ensures one immutable default-agent DM by inserting chats, chatMembers, and chatUpdates while preserving separately created conversations.
 * The caller's transaction publishes the chat and both memberships together so sidebar loading never observes a half-created entry.
 */
export declare function agentDefaultConversationEnsure(executor: DrizzleExecutor, input: {
    userId: string;
    sequence?: number;
}): Promise<string>;
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