diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d9fa56b662..675a636179 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,6 +9,7 @@ on:
   push:
     tags:
       - "v*.*.*"                  # normal release
+      - 'nightly'                 # mutable tag
 
 permissions:
   contents: write
diff --git a/build.sh b/build.sh
index 6c0baef895..05b3274bb4 100755
--- a/build.sh
+++ b/build.sh
@@ -199,6 +199,30 @@ build_cpp() {
     echo -e "${GREEN}✓ C++ static library built successfully${NC}"
 }
 
+# Build C++ test executable
+build_cpp_test() {
+    print_section "Building C++ test executable"
+
+    if [ ! -d "$BUILD_DIR" ]; then
+        echo "Build directory not found, running cmake first..."
+        mkdir -p "$BUILD_DIR"
+        cd "$BUILD_DIR"
+        cmake .. -DCMAKE_BUILD_TYPE=Release
+    else
+        cd "$BUILD_DIR"
+    fi
+
+    echo "Building rag_analyzer_c_test..."
+    make rag_analyzer_c_test -j$(nproc)
+
+    if [ ! -f "$BUILD_DIR/rag_analyzer_c_test" ]; then
+        echo -e "${RED}Error: Failed to build rag_analyzer_c_test${NC}"
+        exit 1
+    fi
+
+    echo -e "${GREEN}✓ C++ test executable built successfully: $BUILD_DIR/rag_analyzer_c_test${NC}"
+}
+
 # Build Go server
 build_go() {
     print_section "Building RAGFlow go"
@@ -312,6 +336,7 @@ Build script for RAGFlow Go server with C++ bindings.
 OPTIONS:
     --all, -a       Build everything (C++ library + Go server) [default]
     --cpp, -c       Build only C++ static library
+    --cpp-test      Build C++ test executable (requires --cpp first)
     --go, -g        Build only Go server (requires C++ library to be built)
     --clean, -C     Clean all build artifacts
     --run, -r       Build and run the server
@@ -321,6 +346,7 @@ EXAMPLES:
     $0              # Build everything
     $0 --cpp        # Build only C++ library
     $0 --go         # Build only Go server
+    $0 --cpp-test   # Build C++ test executable
     $0 --run        # Build and run
     $0 --clean      # Clean build artifacts
 
@@ -343,6 +369,10 @@ main() {
             check_cpp_deps
             build_cpp
             ;;
+        --cpp-test)
+            check_cpp_deps
+            build_cpp_test
+            ;;
         --go|-g)
             check_go_deps
             build_go
diff --git a/docker/docker-compose-base.yml b/docker/docker-compose-base.yml
index fbc13b5d05..36cca3db77 100644
--- a/docker/docker-compose-base.yml
+++ b/docker/docker-compose-base.yml
@@ -253,7 +253,7 @@ services:
   nats:
     profiles:
       - ragflow-go
-    image: nats:2.14.1
+    image: nats:2.14.2
     ports:
       - ${NATS_PORT}:4222
       - "8222:8222"
diff --git a/internal/cpp/CMakeLists.txt b/internal/cpp/CMakeLists.txt
index bcd96a5fe9..2f017a6b90 100644
--- a/internal/cpp/CMakeLists.txt
+++ b/internal/cpp/CMakeLists.txt
@@ -164,7 +164,7 @@ add_executable(rag_analyzer_c_test
         rag_analyzer_c_test.cpp
 )
 
-target_link_libraries(rag_analyzer_c_test rag_tokenizer_c_api stdc++ libm.a ${PCRE2_LIB})
+target_link_libraries(rag_analyzer_c_test rag_tokenizer_c_api stdc++ m ${PCRE2_LIB})
 target_include_directories(rag_analyzer_c_test PUBLIC "${CMAKE_SOURCE_DIR}")
 set_target_properties(rag_analyzer_c_test PROPERTIES
         CXX_STANDARD 20
diff --git a/internal/cpp/rag_analyzer.cpp b/internal/cpp/rag_analyzer.cpp
index 658afec6f3..23377ff40e 100644
--- a/internal/cpp/rag_analyzer.cpp
+++ b/internal/cpp/rag_analyzer.cpp
@@ -684,35 +684,38 @@ RAGAnalyzer::~RAGAnalyzer() {
 
 int32_t RAGAnalyzer::Load() {
     fs::path root(dict_path_);
-    fs::path dict_path(root / DICT_PATH);
 
+    fs::path dict_path(root / DICT_PATH);
+    printf("Validate dict file: %s\n", dict_path.string().c_str());
     if (!fs::exists(dict_path)) {
-        printf("Invalid analyzer file: %s", dict_path.string().c_str());
-        // return Status::InvalidAnalyzerFile(dict_path);
+        printf("Invalid dict file: %s\n", dict_path.string().c_str());
         return -1;
     }
 
     fs::path pos_def_path(root / POS_DEF_PATH);
+    printf("Validate pos file: %s\n", pos_def_path.string().c_str());
     if (!fs::exists(pos_def_path)) {
-        printf("Invalid post file: %s", pos_def_path.string().c_str());
-        // return Status::InvalidAnalyzerFile(pos_def_path);
-        return -1;
+        printf("Invalid pos file: %s\n", pos_def_path.string().c_str());
+        return -2;
     }
     own_dict_ = true;
     trie_ = new DartsTrie();
     pos_table_ = new POSTable(pos_def_path.string());
+    printf("Load pos file: %s\n", pos_def_path.string().c_str());
     if (pos_table_->Load() != 0) {
-        printf("Fail to load post table: %s", pos_def_path.string().c_str());
-        return -1;
-        // return Status::InvalidAnalyzerFile("Failed to load RAGAnalyzer POS definition");
+        printf("Fail to load pos file: %s\n", pos_def_path.string().c_str());
+        return -3;
     }
 
     fs::path trie_path(root / TRIE_PATH);
+    printf("Validate trie file: %s\n", trie_path.string().c_str());
     if (fs::exists(trie_path)) {
+        printf("Load trie file: %s\n", trie_path.string().c_str());
         trie_->Load(trie_path.string());
     } else {
         // Build trie
         try {
+            printf("Build trie file: %s\n", dict_path.string().c_str());
             std::ifstream from(dict_path.string());
             std::string line;
             re2::RE2 re_pattern(R"([\r\n]+)");
@@ -737,36 +740,35 @@ int32_t RAGAnalyzer::Load() {
             }
             trie_->Build();
         } catch (const std::exception &e) {
-            return -1;
-            // return Status::InvalidAnalyzerFile("Failed to load RAGAnalyzer analyzer");
+            printf("Fail to build trie: %s\n", e.what());
+            return -4;
         }
+        printf("Save trie file: %s\n", trie_path.string().c_str());
         trie_->Save(trie_path.string());
     }
 
     fs::path lemma_path(root / WORDNET_PATH);
     if (!fs::exists(lemma_path)) {
-        printf("Fail to load wordnet: %s", lemma_path.string().c_str());
-        return -1;
-        // return Status::InvalidAnalyzerFile(lemma_path);
+        printf("Fail to load wordnet: %s\n", lemma_path.string().c_str());
+        return -5;
     }
 
     wordnet_lemma_ = new WordNetLemmatizer(lemma_path.string());
 
     fs::path opencc_path(root / OPENCC_PATH);
-
+    printf("Validate opencc file: %s\n", opencc_path.string().c_str());
     if (!fs::exists(opencc_path)) {
-        printf("Fail to load opencc_path: %s", opencc_path.string().c_str());
-        return -1;
-        // return Status::InvalidAnalyzerFile(opencc_path);
+        printf("opencc_path not exists: %s\n", opencc_path.string().c_str());
+        return -6;
     }
     try {
+        printf("Load opencc file: %s\n", opencc_path.string().c_str());
         opencc_ = new ::OpenCC(opencc_path.string());
     } catch (const std::exception &e) {
-        return -1;
-        // return Status::InvalidAnalyzerFile("Failed to load OpenCC");
+        printf("Fail to open opencc: %s\n", opencc_path.string().c_str());
+        return -7;
     }
 
-    // return Status::OK();
     return 0;
 }
 
diff --git a/internal/cpp/rag_analyzer_c_test.cpp b/internal/cpp/rag_analyzer_c_test.cpp
index f62401a68e..05a8af6be4 100644
--- a/internal/cpp/rag_analyzer_c_test.cpp
+++ b/internal/cpp/rag_analyzer_c_test.cpp
@@ -10,7 +10,7 @@ void test_single_thread() {
     std::cout << "Test 1: Single thread, 1000 iterations..." << std::endl;
     
     // Create analyzer instance
-    RAGAnalyzerHandle handle = RAGAnalyzer_Create(".");
+    RAGAnalyzerHandle handle = RAGAnalyzer_Create("./resource");
     assert(handle != nullptr && "Failed to create RAGAnalyzer");
     
     // Load the analyzer
@@ -110,8 +110,9 @@ void test_multi_thread() {
 }
 
 int main() {
+    std::cout << "Please make sure the './resource' directory exists and is accessible." << std::endl;
     std::cout << "=== RAGAnalyzer C API Test ===" << std::endl;
-    
+
     test_single_thread();
     // test_multi_thread();
     
diff --git a/internal/entity/tenant.go b/internal/entity/tenant.go
index 88129cb6b1..c17d74469e 100644
--- a/internal/entity/tenant.go
+++ b/internal/entity/tenant.go
@@ -31,10 +31,10 @@ type Tenant struct {
 	TenantImg2TxtID *int64  `gorm:"column:tenant_img2txt_id;index" json:"tenant_img2txt_id,omitempty"`
 	RerankID        string  `gorm:"column:rerank_id;size:128;not null;index" json:"rerank_id"`
 	TenantRerankID  *int64  `gorm:"column:tenant_rerank_id;index" json:"tenant_rerank_id,omitempty"`
-	TTSID           *string `gorm:"column:tts_id;size:256;index" json:"tts_id,omitempty"`
+	TTSID           string  `gorm:"column:tts_id;size:256;index" json:"tts_id,omitempty"`
 	TenantTTSID     *int64  `gorm:"column:tenant_tts_id;index" json:"tenant_tts_id,omitempty"`
 	ParserIDs       string  `gorm:"column:parser_ids;size:256;not null;index" json:"parser_ids"`
-	OCRID           *string `gorm:"column:ocr_id;size:256" json:"ocr_id,omitempty"`
+	OCRID           string  `gorm:"column:ocr_id;size:256" json:"ocr_id,omitempty"`
 	TenantOCRID     *int64  `gorm:"column:tenant_ocr_id" json:"tenant_ocr_id,omitempty"`
 	Credit          int64   `gorm:"column:credit;default:512;index" json:"credit"`
 	Status          *string `gorm:"column:status;size:1;index" json:"status,omitempty"`
diff --git a/internal/server/config.go b/internal/server/config.go
index 620d341199..33cd3bf235 100644
--- a/internal/server/config.go
+++ b/internal/server/config.go
@@ -88,6 +88,8 @@ type DefaultModelsConfig struct {
 	RerankModel     ModelConfig `mapstructure:"rerank_model"`
 	ASRModel        ModelConfig `mapstructure:"asr_model"`
 	Image2TextModel ModelConfig `mapstructure:"image2text_model"`
+	OCRModel        ModelConfig `mapstructure:"ocr_model"`
+	TTSModel        ModelConfig `mapstructure:"tts_model"`
 }
 
 // ModelConfig model configuration
diff --git a/internal/service/tenant.go b/internal/service/tenant.go
index a6e3f43476..095eed7548 100644
--- a/internal/service/tenant.go
+++ b/internal/service/tenant.go
@@ -396,15 +396,9 @@ func (s *TenantService) GetDefaultModelName(tenantID string, modelType entity.Mo
 	case entity.ModelTypeImage2Text:
 		modelID = tenant.Img2TxtID
 	case entity.ModelTypeTTS:
-		if tenant.TTSID == nil {
-			return "", fmt.Errorf("tenant TTS model not configured")
-		}
-		modelID = *tenant.TTSID
+		modelID = tenant.TTSID
 	case entity.ModelTypeOCR:
-		if tenant.OCRID == nil {
-			return "", fmt.Errorf("tenant OCR model not configured")
-		}
-		modelID = *tenant.OCRID
+		modelID = tenant.OCRID
 	default:
 		return "", fmt.Errorf("invalid model type: %s", modelType)
 	}
diff --git a/internal/service/user.go b/internal/service/user.go
index 5afcaf8200..bc568c8f71 100644
--- a/internal/service/user.go
+++ b/internal/service/user.go
@@ -186,6 +186,14 @@ func (s *UserService) Register(req *RegisterRequest) (*entity.User, common.Error
 	if rerankID == "" {
 		rerankID = ""
 	}
+	ttsID := cfg.UserDefaultLLM.DefaultModels.TTSModel.Name
+	if ttsID == "" {
+		ttsID = ""
+	}
+	ocrID := cfg.UserDefaultLLM.DefaultModels.OCRModel.Name
+	if ocrID == "" {
+		ocrID = ""
+	}
 
 	tenant := &entity.Tenant{
 		ID:        userID,
@@ -195,6 +203,8 @@ func (s *UserService) Register(req *RegisterRequest) (*entity.User, common.Error
 		ASRID:     asrID,
 		Img2TxtID: img2txtID,
 		RerankID:  rerankID,
+		TTSID:     ttsID,
+		OCRID:     ocrID,
 		ParserIDs: "naive:General,Q&A:Q&A,manual:Manual,table:Table,paper:Research Paper,book:Book,laws:Laws,presentation:Presentation,picture:Picture,one:One,audio:Audio,email:Email,tag:Tag",
 		Status:    &status,
 	}