diff --git a/api/configs/feature/__init__.py b/api/configs/feature/__init__.py
index 3435048db8..faab8bbc41 100644
--- a/api/configs/feature/__init__.py
+++ b/api/configs/feature/__init__.py
@@ -1,4 +1,4 @@
-from typing import Annotated, Optional
+from typing import Annotated, Literal, Optional
 
 from pydantic import (
     AliasChoices,
@@ -20,11 +20,11 @@ class SecurityConfig(BaseSettings):
     Security-related configurations for the application
     """
 
-    SECRET_KEY: Optional[str] = Field(
+    SECRET_KEY: str = Field(
         description="Secret key for secure session cookie signing."
         "Make sure you are changing this key for your deployment with a strong key."
         "Generate a strong key using `openssl rand -base64 42` or set via the `SECRET_KEY` environment variable.",
-        default=None,
+        default="",
     )
 
     RESET_PASSWORD_TOKEN_EXPIRY_HOURS: PositiveInt = Field(
@@ -186,6 +186,16 @@ class FileUploadConfig(BaseSettings):
         default=10,
     )
 
+    UPLOAD_VIDEO_FILE_SIZE_LIMIT: NonNegativeInt = Field(
+        description="video file size limit in Megabytes for uploading files",
+        default=100,
+    )
+
+    UPLOAD_AUDIO_FILE_SIZE_LIMIT: NonNegativeInt = Field(
+        description="audio file size limit in Megabytes for uploading files",
+        default=50,
+    )
+
     BATCH_UPLOAD_LIMIT: NonNegativeInt = Field(
         description="Maximum number of files allowed in a batch upload operation",
         default=20,
@@ -364,8 +374,8 @@ class WorkflowConfig(BaseSettings):
     )
 
     MAX_VARIABLE_SIZE: PositiveInt = Field(
-        description="Maximum size in bytes for a single variable in workflows. Default to 5KB.",
-        default=5 * 1024,
+        description="Maximum size in bytes for a single variable in workflows. Default to 200 KB.",
+        default=200 * 1024,
     )
 
 
@@ -493,6 +503,7 @@ class RagEtlConfig(BaseSettings):
     Configuration for RAG ETL processes
     """
 
+    # TODO: This config is not only for rag etl, it is also for file upload, we should move it to file upload config
     ETL_TYPE: str = Field(
         description="RAG ETL type ('dify' or 'Unstructured'), default to 'dify'",
         default="dify",
@@ -530,6 +541,11 @@ class DataSetConfig(BaseSettings):
         default=False,
     )
 
+    TIDB_SERVERLESS_NUMBER: PositiveInt = Field(
+        description="number of tidb serverless cluster",
+        default=500,
+    )
+
 
 class WorkspaceConfig(BaseSettings):
     """
@@ -554,7 +570,7 @@ class IndexingConfig(BaseSettings):
 
 
 class ImageFormatConfig(BaseSettings):
-    MULTIMODAL_SEND_IMAGE_FORMAT: str = Field(
+    MULTIMODAL_SEND_IMAGE_FORMAT: Literal["base64", "url"] = Field(
         description="Format for sending images in multimodal contexts ('base64' or 'url'), default is base64",
         default="base64",
     )
@@ -642,7 +658,7 @@ class LoginConfig(BaseSettings):
     )
     ALLOW_REGISTER: bool = Field(
         description="whether to enable register",
-        default=True,
+        default=False,
     )
     ALLOW_CREATE_WORKSPACE: bool = Field(
         description="whether to enable create workspace",