Function cbm_install_prepare_existing_indexes

src/cli/cli.c:9224–9256

 */
int cbm_install_handle_existing_indexes(const char *home, bool reset, bool dry_run);
static int cbm_install_prepare_existing_indexes(const char *home, bool reset, bool dry_run,
                                                bool *delete_indexes_out) {
    if (delete_indexes_out) {
        *delete_indexes_out = false;
    }
    int index_count = count_db_indexes(home);
    if (index_count <= 0) {
        return 1; /* nothing to handle, proceed */
    }

    if (!reset) {
        /* Default: preserve. Be honest — keep the indexes, advise re-index. */
        printf("Found %d existing index(es). Keeping them. After install, "
               "re-index to pick up this version's improvements:\n",
               index_count);
        cbm_list_indexes(home);
        printf("\n");
        return 1; /* proceed without deleting */
    }

    /* Opt-in reset (--reset-indexes): the original prompt-and-delete path. */
    printf("Found %d existing index(es):\n", index_count);
    cbm_list_indexes(home);
    printf("\n");
    if (!prompt_yn("Delete these indexes and continue with install?")) {
        printf("Install cancelled.\n");
        return 0; /* abort */
    }
    if (!dry_run && delete_indexes_out) {
        *delete_indexes_out = true;
    }
    return 1; /* proceed */
}

int cbm_install_handle_existing_indexes(const char *home, bool reset, bool dry_run) {
    bool delete_indexes = false;