Option to import the initial catalog content at any time

src/dds.main.cpp

         catalog_path_flag cat_path{cmd};
 
         args::Flag import_stdin{cmd, "stdin", "Import JSON from stdin", {"stdin"}};
+        args::Flag init{cmd, "initial", "Re-import the initial catalog contents", {"initial"}};
         args::ValueFlagList<std::string>
             json_paths{cmd,
                        "json",
 
         int run() {
             auto cat = cat_path.open();
+            if (init.Get()) {
+                cat.import_initial();
+            }
             for (const auto& json_fpath : json_paths.Get()) {
                 cat.import_json_file(json_fpath);
             }

src/dds/catalog/catalog.cpp

         store(pkg);
     }
 }
+
+void catalog::import_initial() {
+    sqlite3::transaction_guard tr{_db};
+    spdlog::info("Restoring built-in initial catalog contents");
+    store_init_packages(_db, _stmt_cache);
+}

src/dds/catalog/catalog.hpp

     std::vector<package_id> by_name(std::string_view sv) const noexcept;
     std::vector<dependency> dependencies_of(const package_id& pkg) const noexcept;
 
+    void import_initial();
     void import_json_str(std::string_view json_str);
     void import_json_file(path_ref json_path) {
         auto content = dds::slurp_file(json_path);