/**
 * Migration runner for Signet's SQLite database
 *
 * Reads the current schema version from `schema_migrations`, runs
 * any pending migrations in order (each inside a transaction), and
 * records execution in `schema_migrations_audit`.
 */
export interface MigrationDb {
    exec(sql: string): void;
    prepare(sql: string): {
        run(...args: unknown[]): void;
        get(...args: unknown[]): Record<string, unknown> | undefined;
        all(...args: unknown[]): Record<string, unknown>[];
    };
}
export interface MigrationArtifacts {
    readonly tables?: readonly string[];
    readonly columns?: readonly {
        readonly table: string;
        readonly column: string;
        /** Skip verification when the table itself doesn't exist (conditional/repair migrations). */
        readonly optional?: boolean;
    }[];
}
export interface Migration {
    readonly version: number;
    readonly name: string;
    readonly up: (db: MigrationDb) => void;
    readonly artifacts?: MigrationArtifacts;
}
/** Ordered list of all migrations. New migrations go at the end. */
export declare const MIGRATIONS: readonly Migration[];
/**
 * Check whether there are unapplied migrations without running them.
 * Useful for backup-before-migrate logic in the daemon.
 *
 * Fully read-only: uses hasBogusVersion and findPhantomVersions for
 * detection only — no deletes. All repairs run exclusively inside
 * runMigrations so the daemon's backup version label stays accurate.
 */
export declare function hasPendingMigrations(db: MigrationDb): boolean;
/** The highest migration version defined. */
export declare const LATEST_SCHEMA_VERSION: number;
/**
 * Run all pending migrations against `db`.
 *
 * Idempotent — safe to call on every startup. Migrations that have
 * already been applied (tracked in `schema_migrations`) are skipped.
 * Set-based skip logic handles gaps from phantom repair correctly.
 * Each migration runs inside a SAVEPOINT so a failure rolls back
 * only that migration.
 */
export declare function runMigrations(db: MigrationDb): void;
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