diff --git a/api/models/account.py b/api/models/account.py
index 9436d9553d..ba01756021 100644
--- a/api/models/account.py
+++ b/api/models/account.py
@@ -201,7 +201,7 @@ class Tenant(Base):
 
     id: Mapped[str] = mapped_column(StringUUID, server_default=db.text("uuid_generate_v4()"))
     name: Mapped[str] = mapped_column(db.String(255))
-    encrypt_public_key: Mapped[Optional[str]] = mapped_column(db.Text, nullable=True)
+    encrypt_public_key: Mapped[str] = mapped_column(db.Text)
     plan: Mapped[str] = mapped_column(db.String(255), server_default=db.text("'basic'::character varying"))
     status: Mapped[str] = mapped_column(db.String(255), server_default=db.text("'normal'::character varying"))
     custom_config: Mapped[Optional[str]] = mapped_column(db.Text)
diff --git a/api/models/model.py b/api/models/model.py
index ab76a491c1..605fa61985 100644
--- a/api/models/model.py
+++ b/api/models/model.py
@@ -79,7 +79,7 @@ class App(Base):
     name: Mapped[str] = mapped_column(db.String(255))
     description: Mapped[str] = mapped_column(db.Text, server_default=db.text("''::character varying"))
     mode: Mapped[str] = mapped_column(db.String(255))
-    icon_type = mapped_column(db.String(255), nullable=True)  # image, emoji
+    icon_type: Mapped[str] = mapped_column(db.String(255))  # image, emoji
     icon: Mapped[str] = mapped_column(db.String(255))
     icon_background: Mapped[str] = mapped_column(db.String(255))
     app_model_config_id = mapped_column(StringUUID, nullable=True)
@@ -93,12 +93,12 @@ class App(Base):
     is_public: Mapped[bool] = mapped_column(db.Boolean, server_default=db.text("false"))
     is_universal: Mapped[bool] = mapped_column(db.Boolean, server_default=db.text("false"))
     tracing = mapped_column(db.Text, nullable=True)
-    max_active_requests: Mapped[Optional[int]] = mapped_column(nullable=True)
+    max_active_requests: Mapped[Optional[int]]
     created_by = mapped_column(StringUUID, nullable=True)
     created_at = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
     updated_by = mapped_column(StringUUID, nullable=True)
     updated_at: Mapped[datetime] = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
-    use_icon_as_answer_icon = mapped_column(db.Boolean, nullable=False, server_default=db.text("false"))
+    use_icon_as_answer_icon: Mapped[bool] = mapped_column(db.Boolean, nullable=False, server_default=db.text("false"))
 
     @property
     def desc_or_prompt(self):
diff --git a/api/services/app_service.py b/api/services/app_service.py
index e0836cace0..f68bce0ece 100644
--- a/api/services/app_service.py
+++ b/api/services/app_service.py
@@ -1,3 +1,4 @@
+from typing import TypedDict
 import json
 import logging
 from typing import Optional, cast
@@ -220,7 +221,16 @@ class AppService:
 
         return app
 
-    def update_app(self, app: App, args: dict) -> App:
+    class ArgsDict(TypedDict):
+        name: str
+        description: str
+        icon_type: str
+        icon: str
+        icon_background: str
+        use_icon_as_answer_icon: bool
+        max_active_requests: int
+
+    def update_app(self, app: App, args: ArgsDict) -> App:
         """
         Update app
         :param app: App instance