diff --git a/api/configs/middleware/__init__.py b/api/configs/middleware/__init__.py
index 817284d26f..c392b8840f 100644
--- a/api/configs/middleware/__init__.py
+++ b/api/configs/middleware/__init__.py
@@ -160,6 +160,16 @@ class DatabaseConfig(BaseSettings):
         default="",
     )
 
+    DB_SESSION_TIMEZONE_OVERRIDE: str = Field(
+        description=(
+            "PostgreSQL session timezone override injected via startup options."
+            " Default is 'UTC' for out-of-the-box consistency."
+            " Set to empty string to disable app-level timezone injection, for example when using RDS Proxy"
+            " together with a database-side default timezone."
+        ),
+        default="UTC",
+    )
+
     @computed_field  # type: ignore[prop-decorator]
     @property
     def SQLALCHEMY_DATABASE_URI_SCHEME(self) -> str:
@@ -227,12 +237,13 @@ class DatabaseConfig(BaseSettings):
         connect_args: dict[str, str] = {}
         # Use the dynamic SQLALCHEMY_DATABASE_URI_SCHEME property
         if self.SQLALCHEMY_DATABASE_URI_SCHEME.startswith("postgresql"):
-            timezone_opt = "-c timezone=UTC"
-            if options:
-                merged_options = f"{options} {timezone_opt}"
-            else:
-                merged_options = timezone_opt
-            connect_args = {"options": merged_options}
+            merged_options = options.strip()
+            session_timezone_override = self.DB_SESSION_TIMEZONE_OVERRIDE.strip()
+            if session_timezone_override:
+                timezone_opt = f"-c timezone={session_timezone_override}"
+                merged_options = f"{merged_options} {timezone_opt}".strip() if merged_options else timezone_opt
+            if merged_options:
+                connect_args = {"options": merged_options}
 
         result: SQLAlchemyEngineOptionsDict = {
             "pool_size": self.SQLALCHEMY_POOL_SIZE,
diff --git a/api/tests/unit_tests/configs/test_dify_config.py b/api/tests/unit_tests/configs/test_dify_config.py
index d6933e2180..3089750c3e 100644
--- a/api/tests/unit_tests/configs/test_dify_config.py
+++ b/api/tests/unit_tests/configs/test_dify_config.py
@@ -145,7 +145,7 @@ def test_inner_api_config_exist(monkeypatch: pytest.MonkeyPatch):
 
 
 def test_db_extras_options_merging(monkeypatch: pytest.MonkeyPatch):
-    """Test that DB_EXTRAS options are properly merged with default timezone setting"""
+    """Test that DB_EXTRAS options are merged with the default timezone startup option."""
     # Set environment variables
     monkeypatch.setenv("DB_TYPE", "postgresql")
     monkeypatch.setenv("DB_USERNAME", "postgres")
@@ -158,15 +158,28 @@ def test_db_extras_options_merging(monkeypatch: pytest.MonkeyPatch):
     # Create config
     config = DifyConfig()
 
-    # Get engine options
-    engine_options = config.SQLALCHEMY_ENGINE_OPTIONS
-
-    # Verify options contains both search_path and timezone
-    options = engine_options["connect_args"]["options"]
+    options = config.SQLALCHEMY_ENGINE_OPTIONS["connect_args"]["options"]
     assert "search_path=myschema" in options
     assert "timezone=UTC" in options
 
 
+def test_db_session_timezone_override_can_disable_app_level_timezone_injection(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("DB_TYPE", "postgresql")
+    monkeypatch.setenv("DB_USERNAME", "postgres")
+    monkeypatch.setenv("DB_PASSWORD", "postgres")
+    monkeypatch.setenv("DB_HOST", "localhost")
+    monkeypatch.setenv("DB_PORT", "5432")
+    monkeypatch.setenv("DB_DATABASE", "dify")
+    monkeypatch.setenv("DB_EXTRAS", "options=-c search_path=myschema")
+    monkeypatch.setenv("DB_SESSION_TIMEZONE_OVERRIDE", "")
+
+    config = DifyConfig()
+
+    assert config.SQLALCHEMY_ENGINE_OPTIONS["connect_args"] == {
+        "options": "-c search_path=myschema",
+    }
+
+
 def test_pubsub_redis_url_default(monkeypatch: pytest.MonkeyPatch):
     os.environ.clear()