diff --git a/invokeai/app/api/routers/model_manager.py b/invokeai/app/api/routers/model_manager.py
index 2a6d35b92f..36f5c22ac5 100644
--- a/invokeai/app/api/routers/model_manager.py
+++ b/invokeai/app/api/routers/model_manager.py
@@ -74,7 +74,7 @@ example_model_config = {
     "current_hash": "string",
     "description": "string",
     "source": "string",
-    "last_modified": 0,
+    "converted_at": 0,
     "variant": "normal",
     "prediction_type": "epsilon",
     "repo_variant": "fp16",
diff --git a/invokeai/backend/model_manager/config.py b/invokeai/backend/model_manager/config.py
index c70f8faffd..76f1388623 100644
--- a/invokeai/backend/model_manager/config.py
+++ b/invokeai/backend/model_manager/config.py
@@ -138,9 +138,7 @@ class ModelConfigBase(BaseModel):
 
     @staticmethod
     def json_schema_extra(schema: dict[str, Any], model_class: Type[BaseModel]) -> None:
-        schema["required"].extend(
-            ["key", "base", "type", "format", "original_hash", "current_hash", "source", "last_modified"]
-        )
+        schema["required"].extend(["key", "base", "type", "format", "original_hash", "current_hash", "source"])
 
     model_config = ConfigDict(
         use_enum_values=False,
@@ -159,7 +157,7 @@ class CheckpointConfigBase(ModelConfigBase):
 
     format: Literal[ModelFormat.Checkpoint] = ModelFormat.Checkpoint
     config_path: str = Field(description="path to the checkpoint model config file")
-    last_modified: Optional[float] = Field(
+    converted_at: Optional[float] = Field(
         description="When this model was last converted to diffusers", default_factory=time.time
     )
 
@@ -380,5 +378,5 @@ class ModelConfigFactory(object):
         if key:
             model.key = key
         if isinstance(model, CheckpointConfigBase) and timestamp is not None:
-            model.last_modified = timestamp
+            model.converted_at = timestamp
         return model  # type: ignore
diff --git a/invokeai/backend/model_manager/load/model_loaders/controlnet.py b/invokeai/backend/model_manager/load/model_loaders/controlnet.py
index 6ef3f80eb5..ce9ed8f82a 100644
--- a/invokeai/backend/model_manager/load/model_loaders/controlnet.py
+++ b/invokeai/backend/model_manager/load/model_loaders/controlnet.py
@@ -29,7 +29,7 @@ class ControlNetLoader(GenericDiffusersLoader):
             return False
         elif (
             dest_path.exists()
-            and (dest_path / "config.json").stat().st_mtime >= (config.last_modified or 0.0)
+            and (dest_path / "config.json").stat().st_mtime >= (config.converted_at or 0.0)
             and (dest_path / "config.json").stat().st_mtime >= model_path.stat().st_mtime
         ):
             return False
diff --git a/invokeai/backend/model_manager/load/model_loaders/stable_diffusion.py b/invokeai/backend/model_manager/load/model_loaders/stable_diffusion.py
index d8a8732b27..8c12f6ec94 100644
--- a/invokeai/backend/model_manager/load/model_loaders/stable_diffusion.py
+++ b/invokeai/backend/model_manager/load/model_loaders/stable_diffusion.py
@@ -59,7 +59,7 @@ class StableDiffusionDiffusersModel(GenericDiffusersLoader):
             return False
         elif (
             dest_path.exists()
-            and (dest_path / "model_index.json").stat().st_mtime >= (config.last_modified or 0.0)
+            and (dest_path / "model_index.json").stat().st_mtime >= (config.converted_at or 0.0)
             and (dest_path / "model_index.json").stat().st_mtime >= model_path.stat().st_mtime
         ):
             return False
diff --git a/invokeai/backend/model_manager/load/model_loaders/vae.py b/invokeai/backend/model_manager/load/model_loaders/vae.py
index 67a8dee039..e4fc811346 100644
--- a/invokeai/backend/model_manager/load/model_loaders/vae.py
+++ b/invokeai/backend/model_manager/load/model_loaders/vae.py
@@ -31,7 +31,7 @@ class VaeLoader(GenericDiffusersLoader):
             return False
         elif (
             dest_path.exists()
-            and (dest_path / "config.json").stat().st_mtime >= (config.last_modified or 0.0)
+            and (dest_path / "config.json").stat().st_mtime >= (config.converted_at or 0.0)
             and (dest_path / "config.json").stat().st_mtime >= model_path.stat().st_mtime
         ):
             return False