Reduce dev startup memory by deferring unused integrations

news/+backend-startup-followup.performance.md

@@ -0,0 +1 @@
+Reduce backend startup time and memory by avoiding unused database and compiler imports in the backend launcher and state mutation tracking.

news/+dev-mode-imports.performance.md

@@ -0,0 +1 @@
+Reduce development startup and reload memory by deferring unused database and admin integrations and avoiding redundant app preloads in spawned Granian supervisors.

news/7049.bugfix.md

@@ -0,0 +1 @@
+Preserve relationship serialization and database usage accounting for apps that use SQLModel directly, without loading unused database integrations.

packages/reflex-base/news/+lazy-optional-integrations.performance.md

@@ -0,0 +1 @@
+Load pandas, Plotly, and Pillow serializers on demand and avoid importing SQLAlchemy for generic type helpers, reducing startup time and memory when these integrations are unused.

packages/reflex-base/news/7049.bugfix.md

@@ -0,0 +1 @@
+Preserve SQLModel relationships, ObjectVar field access, and optional serializer overrides on cold startup, including classes without module names and multiple optional-library bases. Avoid import-order failures, fork hangs, and registry corruption during serializer lookup.

packages/reflex-base/src/reflex_base/utils/_serializer_types.py

@@ -0,0 +1,39 @@
+"""Optional serializer annotations resolved only when introspected at runtime."""
+
+from importlib import import_module
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from pandas import DataFrame as DataFrame
+    from PIL.Image import Image as Image
+    from plotly.graph_objects import Figure as Figure
+    from plotly.graph_objs.layout import Template as Template
+    from sqlmodel import SQLModel as SQLModel
+
+_TYPE_MODULES = {
+    "DataFrame": "pandas",
+    "Image": "PIL.Image",
+    "Figure": "plotly.graph_objects",
+    "Template": "plotly.graph_objs.layout",
+    "SQLModel": "sqlmodel",
+}
+
+
+def __getattr__(name: str) -> type:
+    """Resolve an optional type without importing unused serializer dependencies.
+
+    Args:
+        name: The optional type name.
+
+    Returns:
+        The concrete type from its optional dependency.
+
+    Raises:
+        AttributeError: If the name is not an optional serializer type.
+    """
+    if name not in _TYPE_MODULES:
+        msg = f"module {__name__!r} has no attribute {name!r}"
+        raise AttributeError(msg)
+    value = getattr(import_module(_TYPE_MODULES[name]), name)
+    globals()[name] = value
+    return value