Function cbm_store_generation

src/store/store.c:1646–1667

Opaque store generation for pagination cursors: "u g ", * or "legacy" when the DB predates store_meta (read-only opens never create * it). A cursor whose embedded generation mismatches the store's current one * is stale — the graph may have changed under it. */

 * it). A cursor whose embedded generation mismatches the store's current one
 * is stale — the graph may have changed under it. */
int cbm_store_generation(cbm_store_t *s, char *buf, size_t bufsz) {
    if (!s || !s->db || !buf || bufsz == 0) {
        return CBM_STORE_ERR;
    }
    snprintf(buf, bufsz, "legacy");
    sqlite3_stmt *stmt = NULL;
    if (sqlite3_prepare_v2(s->db,
                           "SELECT (SELECT v FROM store_meta WHERE k='db_uid'),"
                           "       (SELECT v FROM store_meta WHERE k='mutation_gen');",
                           CBM_NOT_FOUND, &stmt, NULL) != SQLITE_OK) {
        return CBM_STORE_OK; /* pre-migration DB: stable "legacy" generation */
    }
    if (sqlite3_step(stmt) == SQLITE_ROW) {
        const char *uid = (const char *)sqlite3_column_text(stmt, 0);
        const char *gen = (const char *)sqlite3_column_text(stmt, SKIP_ONE);
        if (uid && gen) {
            snprintf(buf, bufsz, "u%sg%s", uid, gen);
        }
    }
    sqlite3_finalize(stmt);
    return CBM_STORE_OK;
}

int cbm_store_get_project(cbm_store_t *s, const char *name, cbm_project_t *out) {
    sqlite3_stmt *stmt =