diff --git a/src/meson.build b/src/meson.build
index 2ce7ba3..347b716 100755
--- a/src/meson.build
+++ b/src/meson.build
@@ -3,8 +3,7 @@ headers = [
   'pgxx/pgxx.hpp',
   'pgxx/query_builder.hpp',
 
-  'pgxx/utils/define.hpp',
-  'pgxx/utils/using.hpp',
+  'pgxx/utils/aliases.hpp',
   'pgxx/utils/var.hpp',
 ]
 
diff --git a/src/pgxx/pgxx.hpp b/src/pgxx/pgxx.hpp
index 4cd20d4..b8ac01a 100644
--- a/src/pgxx/pgxx.hpp
+++ b/src/pgxx/pgxx.hpp
@@ -4,55 +4,45 @@
 #include "hack/exception/exception.hpp"
 #include "hack/logger/logger.hpp"
 
-#include "pgxx/utils/define.hpp"
-#include "pgxx/utils/using.hpp"
-#include "pgxx/utils/var.hpp"
-#include "pgxx/query_builder.hpp"
-#include "pgxx/pool_connection.hpp"
+#include "utils/aliases.hpp" // IWYU pragma: keep
+#include "utils/var.hpp"
+#include "pool_connection.hpp"
 
 namespace pgxx
 {
-  class manager : public hack::utils::singleton<manager>
+  class database : public hack::utils::singleton<database>
   {
-    friend hack::utils::singleton<manager>;
+    friend hack::utils::singleton<database>;
 
     public:
-      ~manager() = default;
+      ~database() = default;
 
     private:
-      manager() = default;
-      std::map<std::string, pool_connection> m_data_connections;
+      database() = default;
+      std::map<std::string, pool_connection> m_connections;
 
     public:
-      bool ready() { return m_data_connections.size() != 0; }
+      bool ready() { return m_connections.size() != 0; }
 
       void init(std::string connection_name, int connection_count, std::string connection_url)
       {
-        m_data_connections[connection_name] = pool_connection { connection_count, connection_url };
+        m_connections[connection_name] = pool_connection { connection_count, connection_url };
         hack::log("")("make connection [", connection_name, "] completed");
       }
 
       template<typename... Args>
-      JSON execute(const std::string connection_name, std::string func_name, const Args&... args)
+      pqxx::result execute(const std::string connection_name, std::string query)
       {
-        auto query = prepare(func_name, args...);
-        JSON result;
+        pqxx::result r;
 
         try
         {
-          auto c = m_data_connections[connection_name].get();
+          auto c = m_connections[connection_name].get();
 
-          pqxx::result r;
           pqxx::work work { *c };
           r = work.exec(query);
-
-          std::string r_str;
-          for (auto row : r) r_str = row.at(0).c_str();
-
           work.commit();
-          m_data_connections[connection_name].release(c);
-
-          result = JSON::parse(r_str);
+          m_connections[connection_name].release(c);
         }
         catch (const std::exception& e)
         {
@@ -61,15 +51,6 @@ namespace pgxx
           ex.system_error(e);
           ex.params("connection_name", connection_name);
           ex.params("query", query);
-          ex.params("result", result);
-
-          if (connection_name == var::LOG_CONNECTION) 
-          {
-            hack::error()("WARNING!!! ERROR LOG TO DATABASE");
-            hack::error()("query", query);
-            hack::error()(e.what());
-            std::terminate();
-          }
           throw ex; 
         }
         catch (...)
@@ -79,44 +60,11 @@ namespace pgxx
           ex.message(var::EXECUTE_ERROR);
           ex.params("connection_name", connection_name);
           ex.params("query", query);
-          ex.params("result", result);
-          
-          if (connection_name == var::LOG_CONNECTION) 
-          {
-            hack::error()("WARNING!!! ERROR LOG TO DATABASE");
-            hack::error()("query", query);
-            std::terminate();
-          }
           throw ex;
         }
 
-        return result;
+        return r;
       }
-
-    private:
-      template<typename... Args>
-      std::string prepare(const std::string func_name, const Args&... args)
-      {
-        std::string query;
-
-        try
-        {
-          query = builder::make_query(func_name, args...);
-        }
-        catch (const std::exception& e)
-        {
-          hack::exception ex;
-          ex.description("database dont create query from args");
-          ex.system_error(e);
-          ex.params("query", query);
-          ex.variadic_params(args...);
-          throw ex; 
-        }
-
-        return query;
-      }
-
-
   }; 
 }
 
diff --git a/src/pgxx/query_builder.hpp b/src/pgxx/query_builder.hpp
index 294ba1d..201f7db 100644
--- a/src/pgxx/query_builder.hpp
+++ b/src/pgxx/query_builder.hpp
@@ -2,25 +2,22 @@
 
 #include <regex>
 
-#include "hack/string/string_concat_helper.hpp"
 #include "hack/concepts/concepts.hpp"
 
-#include "utils/using.hpp"
-
 namespace pgxx::builder
 {
   template<hack::concepts::is_string First>
   std::string make_one(First f)
   {
     f = std::regex_replace(f, std::regex("'"), "[quote]");
-    return hack::string::str_concat + "'" + f + "',";
+    return "'" + f + "',";
   }
 
   inline std::string make_one(const char* f)
   {
     auto f_str = std::string(f);
     f_str = std::regex_replace(f_str, std::regex("'"), "[quote]");
-    return hack::string::str_concat + "'" + f_str + "',";
+    return "'" + f_str + "',";
   }
 
   inline std::string make_one(char f)
@@ -34,35 +31,28 @@ namespace pgxx::builder
   {
     auto f_str = std::to_string(f);
     f_str = std::regex_replace(f_str, std::regex("'"), "[quote]");
-    return hack::string::str_concat + "'" + f_str + "',";
+    return "'" + f_str + "',";
   }
 
   inline std::string make_one(const float f)
   {
     auto f_str = std::to_string(f);
     f_str = std::regex_replace(f_str, std::regex("'"), "[quote]");
-    return hack::string::str_concat + f_str + ",";
+    return f_str + ",";
   }
 
   inline std::string make_one(int f)
   {
     auto f_str = std::to_string(f);
     f_str = std::regex_replace(f_str, std::regex("'"), "[quote]");
-    return hack::string::str_concat + f_str + ",";
+    return f_str + ",";
   }
 
   inline std::string make_one(const std::string& f)
   {
     auto f_str = f;
     f_str = std::regex_replace(f_str, std::regex("'"), "[quote]");
-    return hack::string::str_concat + "'" + f_str + "',";
-  }
-
-  inline std::string make_one(const JSON& f)
-  {
-    auto f_str = f.dump();
-    f_str = std::regex_replace(f_str, std::regex("'"), "[quote]");
-    return hack::string::str_concat + "'" + f_str + "'::jsonb,";
+    return "'" + f_str + "',";
   }
 
   // это заглушкa при компиляции пустых данных
diff --git a/src/pgxx/utils/aliases.hpp b/src/pgxx/utils/aliases.hpp
new file mode 100644
index 0000000..d6942a0
--- /dev/null
+++ b/src/pgxx/utils/aliases.hpp
@@ -0,0 +1,5 @@
+#pragma once 
+
+#ifndef PGXX
+#define PGXX() pgxx::database::instance()
+#endif
diff --git a/src/pgxx/utils/define.hpp b/src/pgxx/utils/define.hpp
deleted file mode 100644
index f293701..0000000
--- a/src/pgxx/utils/define.hpp
+++ /dev/null
@@ -1,3 +0,0 @@
-#pragma once 
-
-#define PGXX() pgxx::manager::instance()
diff --git a/src/pgxx/utils/using.hpp b/src/pgxx/utils/using.hpp
deleted file mode 100644
index 8bf172e..0000000
--- a/src/pgxx/utils/using.hpp
+++ /dev/null
@@ -1,8 +0,0 @@
-#pragma once 
-
-#include "nlohmann/json.hpp"
-
-namespace pgxx
-{
-  using JSON = nlohmann::json;
-}
diff --git a/tests/main.cpp b/tests/main.cpp
index 3aa3747..2a0366e 100644
--- a/tests/main.cpp
+++ b/tests/main.cpp
@@ -1,7 +1,177 @@
-#include <thread>
+#include <future>
 #include <string>
+#include <vector>
 
 #include "pgxx/pgxx.hpp"
+#include "thread/pool.hpp"
+
+const int MAX_QUERY_IN_DB = 10'000;
+const float MAX_OVERLAP = 12.f;
+
+struct bit
+{
+  std::string m_id;
+  std::string m_url;
+  std::string m_artist;
+  std::string m_song;
+  std::vector<int> m_key;
+  std::vector<int> m_duration;
+};
+
+bit target;
+
+std::vector<int> parse_array(const std::string& arr_str) 
+{
+  std::vector<int> result;
+  std::stringstream ss(arr_str);
+  std::string item;
+
+  while (std::getline(ss, item, ',')) 
+  {
+    try 
+    {
+      result.push_back(std::stoi(item));
+    } 
+    catch (const std::invalid_argument&) 
+    {
+      std::cerr << "Ошибка преобразования: " << item << std::endl;
+    }
+  }
+  return result;
+}
+
+namespace calc
+{
+  inline int calculation(int db_offset)
+  {
+    std::vector<bit> vb;
+    vb.reserve(MAX_QUERY_IN_DB);
+
+    std::string query = "SELECT * FROM t_media LIMIT " + std::to_string(MAX_QUERY_IN_DB) + " OFFSET " + std::to_string(db_offset);
+    auto r = PGXX().execute("con_1", query);
+
+    for (auto el : r)
+    {
+      bit b;
+
+      b.m_id = el["m_id"].as<std::string>();
+      b.m_url = el["m_url"].as<std::string>();
+      b.m_artist = el["m_artist"].as<std::string>();
+      b.m_song = el["m_song"].as<std::string>();
+      
+      std::string str =  el["m_key"].as<std::string>();
+      b.m_key = parse_array(str);
+
+      str =  el["m_duration"].as<std::string>();
+      b.m_duration = parse_array(str);
+      vb.push_back(b);
+    }
+
+    return vb.size();
+  }
+}
+
+namespace executor
+{
+  inline void get_recomended()
+  {
+    try
+    {
+      int count = 0;
+      std::string query = "SELECT count(*) FROM t_media WHERE m_cleared = 0;";
+      auto r = PGXX().execute("con_1", query);
+      for (auto eld : r) count = eld["count"].as<int>();
+
+      thread::pool pool;
+
+      auto start = std::chrono::high_resolution_clock::now();
+      int i = 0;
+      int def = count / MAX_QUERY_IN_DB + 1;
+      int db_offset = 0;
+
+      std::vector<std::future<int>> futures;
+      futures.reserve(def);
+
+      while (def > 0)
+      {
+        futures.push_back(pool.enqueue(calc::calculation, db_offset));
+        db_offset += MAX_QUERY_IN_DB;
+        --def;
+      }
+
+      for (auto &f : futures)
+      {
+        int r = f.get();
+        i += r;
+      }
+
+      std::chrono::duration<double> elapsed = std::chrono::high_resolution_clock::now() - start;
+      hack::log()(i, elapsed.count());
+    }
+    catch(const std::exception& e)
+    {
+      hack::log()(e.what());
+      throw; 
+    }
+    catch(hack::exception& ex)
+    {
+      ex.log();
+      throw;
+    }
+    catch(...)
+    {
+      hack::log()("ooops!");
+      throw; 
+    }
+  }
+}
+
+void convert_db()
+{
+  bool is_work = true;
+  int count = 0;
+  while (is_work)
+  {
+    try
+    {
+      std::string query = "SELECT * FROM t_media WHERE m_cleared = 0 LIMIT " + std::to_string(1) + ";";
+      auto r = PGXX().execute("con_1", query);
+      hack::log("")("size = ", r.size(), ", count = ", count);
+
+      for (auto el : r)
+      {
+        target.m_id = el["m_id"].as<std::string>();
+        target.m_url = el["m_url"].as<std::string>();
+        target.m_artist = el["m_artist"].as<std::string>();
+        target.m_song = el["m_song"].as<std::string>();
+
+        std::string key = el["m_key"].as<std::string>();
+        std::string duration = el["m_duration"].as<std::string>();
+
+        query = "UPDATE t_media SET m_cleared = 1 WHERE m_id = '" + target.m_id + "';";
+        PGXX().execute("con_1", query);
+
+        executor::get_recomended();
+      }
+
+      query = "SELECT count(*) FROM t_media WHERE m_cleared = 0;";
+      r = PGXX().execute("con_1", query);
+
+      for (auto eld : r)
+      {
+        auto c = eld["count"].as<int>();
+        if (count - c > 1) hack::log()("DOUBLE");
+        count = c;
+      }
+
+      if (count == 0) is_work = false;
+    }
+    catch(hack::exception& e)
+    {
+      e.log();
+    }
+  }
+}
 
 auto main(int argc, char* args[]) -> int
 {
@@ -10,7 +180,6 @@ auto main(int argc, char* args[]) -> int
   try
   {
     PGXX().init("con_1", 300, con);
-    PGXX().init("con_2", 300, con);
   }
   catch(hack::exception& ex)
   {
@@ -21,24 +190,5 @@ auto main(int argc, char* args[]) -> int
   if (!PGXX().ready())
     hack::log()("error connection");
 
-  pgxx::JSON j { 
-    { 
-      "params", { { "key_1", 1 }, { "key2", "value" } }
-    } 
-  };
-
-  for (auto i = 0; i < 10; ++i)
-  {
-    std::thread th([&j](){
-      auto r = PGXX().execute("con_1", "read_and_write", j);
-    });
-    th.detach();
-  }
-
-  for (auto i = 0; i < 10; ++i)
-  {
-    auto r = PGXX().execute("con_2", "read_and_write", j);
-  }
-
-  hack::log()("ok");
+  convert_db();
 }
diff --git a/tests/thread/pool.hpp b/tests/thread/pool.hpp
new file mode 100644
index 0000000..e265417
--- /dev/null
+++ b/tests/thread/pool.hpp
@@ -0,0 +1,288 @@
+#pragma once 
+
+#include <atomic>
+#include <concepts>
+#include <deque>
+#include <functional>
+#include <future>
+#include <memory>
+#include <semaphore>
+#include <thread>
+#include <type_traits>
+
+#include "queue.hpp"
+
+namespace thread 
+{
+  namespace details 
+  {
+    using default_function_type = std::function<void()>;
+  }  
+
+  template <typename FunctionType = details::default_function_type, typename ThreadType = std::jthread>
+  requires std::invocable<FunctionType> && std::is_same_v<void, std::invoke_result_t<FunctionType>>
+  class pool 
+  {
+    public:
+      template <typename InitializationFunction = std::function<void(std::size_t)>>
+      requires std::invocable<InitializationFunction, std::size_t> && std::is_same_v<void, std::invoke_result_t<InitializationFunction, std::size_t>>
+      explicit pool(const unsigned int& number_of_threads = std::thread::hardware_concurrency(), InitializationFunction init = [](std::size_t) {}) : tasks_(number_of_threads) 
+      {
+        std::size_t current_id = 0;
+        for (std::size_t i = 0; i < number_of_threads; ++i) 
+        {
+          priority_queue_.push_back(size_t(current_id));
+          try 
+          {
+            threads_.emplace_back([&, id = current_id, init](const std::stop_token &stop_tok) {
+              // invoke the init function on the thread
+              try 
+              {
+                std::invoke(init, id);
+              } 
+              catch (...) 
+              {
+                // suppress exceptions
+              }
+
+              do 
+              {
+                // wait until signaled
+                tasks_[id].signal.acquire();
+                do 
+                {
+                  // invoke the task
+                  while (auto task = tasks_[id].tasks.pop_front()) 
+                  {
+                    // decrement the unassigned tasks as the task is now going
+                    // to be executed
+                    unassigned_tasks_.fetch_sub(1, std::memory_order_release);
+                    // invoke the task
+                    std::invoke(std::move(task.value()));
+                    // the above task can push more work onto the pool, so we
+                    // only decrement the in flights once the task has been
+                    // executed because now it's now longer "in flight"
+                    in_flight_tasks_.fetch_sub(1, std::memory_order_release);
+                  }
+
+                  // try to steal a task
+                  for (std::size_t j = 1; j < tasks_.size(); ++j) 
+                  {
+                    const std::size_t index = (id + j) % tasks_.size();
+                    if (auto task = tasks_[index].tasks.steal()) 
+                    {
+                      // steal a task
+                      unassigned_tasks_.fetch_sub(1, std::memory_order_release);
+                      std::invoke(std::move(task.value()));
+                      in_flight_tasks_.fetch_sub(1, std::memory_order_release);
+                      // stop stealing once we have invoked a stolen task
+                      break;
+                    }
+                  }
+                  // check if there are any unassigned tasks before rotating to the
+                  // front and waiting for more work
+                } while (unassigned_tasks_.load(std::memory_order_acquire) > 0);
+
+                priority_queue_.rotate_to_front(id);
+                // check if all tasks are completed and release the "barrier"
+                if (in_flight_tasks_.load(std::memory_order_acquire) == 0) 
+                {
+                  // in theory, only one thread will set this
+                  threads_complete_signal_.store(true, std::memory_order_release);
+                  threads_complete_signal_.notify_one();
+                }
+              } while (!stop_tok.stop_requested());
+            });
+            // increment the thread id
+            ++current_id;
+          } 
+          catch (...) 
+          {
+            tasks_.pop_back();
+            std::ignore = priority_queue_.pop_back();
+          }
+        }
+      }
+
+      ~pool() 
+      {
+        wait_for_tasks();
+        // stop all threads
+        for (std::size_t i = 0; i < threads_.size(); ++i) 
+        {
+          threads_[i].request_stop();
+          tasks_[i].signal.release();
+          threads_[i].join();
+        }
+      }
+
+      /// thread pool is non-copyable
+      pool(const pool &) = delete;
+      pool &operator=(const pool &) = delete;
+
+      /**
+       * @brief Enqueue a task into the thread pool that returns a result.
+       * @details Note that task execution begins once the task is enqueued.
+       * @tparam Function An invokable type.
+       * @tparam Args Argument parameter pack
+       * @tparam ReturnType The return type of the Function
+       * @param f The callable function
+       * @param args The parameters that will be passed (copied) to the function.
+       * @return A std::future<ReturnType> that can be used to retrieve the returned value.
+       */
+      template <typename Function, typename... Args, typename ReturnType = std::invoke_result_t<Function &&, Args &&...>>
+      requires std::invocable<Function, Args...>
+      [[nodiscard]] std::future<ReturnType> enqueue(Function f, Args... args) 
+      {
+        /*
+         * use shared promise here so that we don't break the promise later (until C++23)
+         *
+         * with C++23 we can do the following:
+         *
+         * std::promise<ReturnType> promise;
+         * auto future = promise.get_future();
+         * auto task = [func = std::move(f), ...largs = std::move(args),
+                          promise = std::move(promise)]() mutable {...};
+         */
+        auto shared_promise = std::make_shared<std::promise<ReturnType>>();
+        auto task = [func = std::move(f), ... largs = std::move(args), promise = shared_promise]() {
+          try 
+          {
+            if constexpr (std::is_same_v<ReturnType, void>) 
+            {
+              func(largs...);
+              promise->set_value();
+            } 
+            else 
+            {
+              promise->set_value(func(largs...));
+            }
+
+          } 
+          catch (...) 
+          {
+            promise->set_exception(std::current_exception());
+          }
+        };
+
+        // get the future before enqueuing the task
+        auto future = shared_promise->get_future();
+        // enqueue the task
+        enqueue_task(std::move(task));
+        return future;
+      }
+
+      /**
+       * @brief Enqueue a task to be executed in the thread pool. Any return value of the function
+       * will be ignored.
+       * @tparam Function An invokable type.
+       * @tparam Args Argument parameter pack for Function
+       * @param func The callable to be executed
+       * @param args Arguments that will be passed to the function.
+       */
+      template <typename Function, typename... Args>
+      requires std::invocable<Function, Args...>
+      void enqueue_detach(Function &&func, Args &&...args) 
+      {
+        enqueue_task(std::move([f = std::forward<Function>(func), ... largs = std::forward<Args>(args)]() mutable -> decltype(auto) {
+          // suppress exceptions
+          try 
+          {
+            if constexpr (std::is_same_v<void, std::invoke_result_t<Function &&, Args &&...>>) 
+            {
+              std::invoke(f, largs...);
+            } 
+            else 
+            {
+              // the function returns an argument, but can be ignored
+              std::ignore = std::invoke(f, largs...);
+            }
+          } 
+          catch (...) 
+          {
+          }
+        }));
+      }
+
+      /**
+       * @brief Returns the number of threads in the pool.
+       *
+       * @return std::size_t The number of threads in the pool.
+       */
+      [[nodiscard]] auto size() const { return threads_.size(); }
+
+      /**
+       * @brief Wait for all tasks to finish.
+       * @details This function will block until all tasks have been completed.
+       */
+      void wait_for_tasks() 
+      {
+        if (in_flight_tasks_.load(std::memory_order_acquire) > 0) 
+        {
+          // wait for all tasks to finish
+          threads_complete_signal_.wait(false);
+        }
+      }
+
+      /**
+       * @brief Makes best-case attempt to clear all tasks from the thread_pool
+       * @details Note that this does not guarantee that all tasks will be cleared, as currently
+       * running tasks could add additional tasks. Also a thread could steal a task from another
+       * in the middle of this.
+       * @return number of tasks cleared
+       */
+      size_t clear_tasks() 
+      {
+        size_t removed_task_count{0};
+        for (auto &task_list : tasks_) 
+        {
+          removed_task_count += task_list.tasks.clear();
+        }
+        in_flight_tasks_.fetch_sub(removed_task_count, std::memory_order_release);
+        unassigned_tasks_.fetch_sub(removed_task_count, std::memory_order_release);
+
+        return removed_task_count;
+      }
+
+    private:
+      template <typename Function>
+      void enqueue_task(Function &&f) 
+      {
+        auto i_opt = priority_queue_.copy_front_and_rotate_to_back();
+        if (!i_opt.has_value()) 
+        {
+          // would only be a problem if there are zero threads
+          return;
+        }
+        // get the index
+        auto i = *(i_opt);
+
+        // increment the unassigned tasks and in flight tasks
+        unassigned_tasks_.fetch_add(1, std::memory_order_release);
+        const auto prev_in_flight = in_flight_tasks_.fetch_add(1, std::memory_order_release);
+
+        // reset the in flight signal if the list was previously empty
+        if (prev_in_flight == 0) 
+        {
+          threads_complete_signal_.store(false, std::memory_order_release);
+        }
+
+        // assign work
+        tasks_[i].tasks.push_back(std::forward<Function>(f));
+        tasks_[i].signal.release();
+      }
+
+      struct task_item 
+      {
+        queue<FunctionType> tasks{};
+        std::binary_semaphore signal{0};
+      };
+
+      std::vector<ThreadType> threads_;
+      std::deque<task_item> tasks_;
+      queue<std::size_t> priority_queue_;
+      // guarantee these get zero-initialized
+      std::atomic_int_fast64_t unassigned_tasks_{0}, in_flight_tasks_{0};
+      std::atomic_bool threads_complete_signal_{false};
+  };
+} 
diff --git a/tests/thread/queue.hpp b/tests/thread/queue.hpp
new file mode 100644
index 0000000..7681c0a
--- /dev/null
+++ b/tests/thread/queue.hpp
@@ -0,0 +1,108 @@
+#pragma once
+
+#include <algorithm>
+#include <deque>
+#include <mutex>
+#include <optional>
+
+namespace thread 
+{
+  template <typename T>
+  class queue 
+  {
+    public:
+      using value_type = T;
+      using size_type = typename std::deque<T>::size_type;
+
+    public:
+      queue() = default;
+
+      void push_back(T&& value) 
+      {
+        std::scoped_lock lock(m_mutex);
+        m_data.push_back(std::forward<T>(value));
+      }
+
+      void push_front(T&& value) 
+      {
+        std::scoped_lock lock(m_mutex);
+        m_data.push_front(std::forward<T>(value));
+      }
+
+      [[nodiscard]] bool empty() const 
+      {
+        std::scoped_lock lock(m_mutex);
+        return m_data.empty();
+      }
+
+      size_type clear() 
+      {
+        std::scoped_lock lock(m_mutex);
+        auto size = m_data.size();
+        m_data.clear();
+
+        return size;
+      }
+
+      [[nodiscard]] std::optional<T> pop_front() 
+      {
+        std::scoped_lock lock(m_mutex);
+        if (m_data.empty()) return std::nullopt;
+
+        auto front = std::move(m_data.front());
+        m_data.pop_front();
+        return front;
+      }
+
+      [[nodiscard]] std::optional<T> pop_back() 
+      {
+        std::scoped_lock lock(m_mutex);
+        if (m_data.empty()) return std::nullopt;
+
+        auto back = std::move(m_data.back());
+        m_data.pop_back();
+        return back;
+      }
+
+      [[nodiscard]] std::optional<T> steal() 
+      {
+        std::scoped_lock lock(m_mutex);
+        if (m_data.empty()) return std::nullopt;
+
+        auto back = std::move(m_data.back());
+        m_data.pop_back();
+        return back;
+      }
+
+      void rotate_to_front(const T& item) 
+      {
+        std::scoped_lock lock(m_mutex);
+        auto iter = std::find(m_data.begin(), m_data.end(), item);
+
+        if (iter != m_data.end()) 
+        {
+          std::ignore = m_data.erase(iter);
+        }
+
+        m_data.push_front(item);
+      }
+
+      [[nodiscard]] std::optional<T> copy_front_and_rotate_to_back() 
+      {
+        std::scoped_lock lock(m_mutex);
+
+        if (m_data.empty()) return std::nullopt;
+
+        auto front = m_data.front();
+        m_data.pop_front();
+
+        m_data.push_back(front);
+
+        return front;
+      }
+
+    private:
+      std::deque<T> m_data{};
+      std::mutex m_mutex{};
+  };
+}