diff --git a/api/Dockerfile b/api/Dockerfile
index 64cb004..5e74c77 100644
--- a/api/Dockerfile
+++ b/api/Dockerfile
@@ -15,4 +15,10 @@ COPY --from=builder /app/build/api/asio-grpc-server /app/asio-grpc-server
 # Run
 CMD ["/app/asio-grpc-server"]
 
-EXPOSE 50051
\ No newline at end of file
+EXPOSE 50051
+
+# Metadata
+LABEL project="eternity2"
+LABEL description="Eternity II Asio gRPC server"
+LABEL version="1.0"
+LABEL repository="https://github.com/Apoorva64/eternity2"
\ No newline at end of file
diff --git a/api/main.cpp b/api/main.cpp
index f95b36a..ccfb70b 100644
--- a/api/main.cpp
+++ b/api/main.cpp
@@ -32,7 +32,6 @@
 #include <unifex/timed_single_thread_context.hpp>
 #include <unifex/when_all.hpp>
 #include <unifex/with_query_value.hpp>
-// Example showing some of the features of using asio-grpc with libunifex.
 
 template<class Sender>
 void run_grpc_context_for_sender(agrpc::GrpcContext &grpc_context, Sender &&sender)
diff --git a/api/solver/solvera.cpp b/api/solver/solvera.cpp
index bb22a1a..d9eb40c 100644
--- a/api/solver/solvera.cpp
+++ b/api/solver/solvera.cpp
@@ -181,21 +181,19 @@ auto handle_server_solver_request_step_by_step(agrpc::GrpcContext &grpc_context,
             while (!shared_data.stop)
             {
                 co_await delay(std::chrono::milliseconds{request.wait_time()});
-                mutex.lock();
+                std::scoped_lock lock(mutex);
                 for (auto &res : responses)
                 {
                     if (!co_await rpc.write(res))
                     {
                         spdlog::info("Client cancelled request");
                         shared_data.stop = true;
-                        mutex.unlock();
                         solver_thread.join();
                         co_await rpc.finish(grpc::Status::CANCELLED);
                         co_return;
                     }
                 }
                 responses.clear();
-                mutex.unlock();
             }
             co_await rpc.finish(grpc::Status::OK);
         });
diff --git a/solver/CMakeLists.txt b/solver/CMakeLists.txt
index bceeadf..0b49991 100644
--- a/solver/CMakeLists.txt
+++ b/solver/CMakeLists.txt
@@ -49,7 +49,9 @@ add_library(solver_lib STATIC
         format/format.cpp
         format/format.h
         solver/solver.h
-        solver/solver.cpp board/scan_row.cpp board/scan_row.h board/spiral.cpp board/spiral.h)
+        solver/solver.cpp board/scan_row.cpp board/scan_row.h board/spiral.cpp board/spiral.h
+        hash_load_store/hash_store_load.cpp
+        hash_load_store/hash_store_load.h)
 
 target_include_directories(solver_lib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
diff --git a/solver/hash_load_store/hash_store_load.cpp b/solver/hash_load_store/hash_store_load.cpp
new file mode 100644
index 0000000..05a2520
--- /dev/null
+++ b/solver/hash_load_store/hash_store_load.cpp
@@ -0,0 +1,26 @@
+//
+// Created by appad on 03/03/2024.
+//
+
+#include "hash_store_load.h"
+void store_hash(std::unordered_set<BoardHash> &hashes, const std::string &filename)
+{
+    std::ofstream file;
+    file.open(filename);
+    for (const auto &hash : hashes)
+    {
+        file << hash << '\n';
+    }
+    file.close();
+}
+void load_hash(std::unordered_set<BoardHash> &hashes, const std::string &filename)
+{
+    std::ifstream file;
+    file.open(filename);
+    std::string line;
+    while (std::getline(file, line))
+    {
+        hashes.insert(line);
+    }
+    file.close();
+}
diff --git a/solver/hash_load_store/hash_store_load.h b/solver/hash_load_store/hash_store_load.h
new file mode 100644
index 0000000..c7d87e6
--- /dev/null
+++ b/solver/hash_load_store/hash_store_load.h
@@ -0,0 +1,18 @@
+//
+// Created by appad on 03/03/2024.
+//
+
+#ifndef ETERNITY2_HASH_STORE_LOAD_H
+#define ETERNITY2_HASH_STORE_LOAD_H
+
+#include "board/board.h"
+
+#include <fstream>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+void store_hash(std::unordered_set<BoardHash> &hashes, const std::string &filename);
+
+void load_hash(std::unordered_set<BoardHash> &hashes, const std::string &filename);
+#endif //ETERNITY2_HASH_STORE_LOAD_H
diff --git a/solver/solver/solver.h b/solver/solver/solver.h
index b0b2446..ad8306a 100644
--- a/solver/solver/solver.h
+++ b/solver/solver/solver.h
@@ -17,8 +17,6 @@ struct SharedData
     unsigned int hash_length_threshold                 = 7;
 };
 
-SharedData create_shared_data();
-
 auto possible_pieces(const Board &board, const std::vector<PieceWAvailability> &pieces, Index index)
     -> std::vector<RotatedPiece>;