diff --git a/ldm/invoke/CLI.py b/ldm/invoke/CLI.py
index f01265e518..7531d598a5 100644
--- a/ldm/invoke/CLI.py
+++ b/ldm/invoke/CLI.py
@@ -557,8 +557,8 @@ def del_config(model_name:str, gen, opt, completer):
     if model_name == current_model:
         print("** Can't delete active model. !switch to another model first. **")
         return
-    if gen.model_cache.del_model(model_name):
-        gen.model_cache.commit(opt.conf)
+    gen.model_cache.del_model(model_name)
+    gen.model_cache.commit(opt.conf)
     print(f'** {model_name} deleted')
     completer.del_model(model_name)
     
diff --git a/ldm/invoke/model_cache.py b/ldm/invoke/model_cache.py
index d63a6be85b..5f041f8c11 100644
--- a/ldm/invoke/model_cache.py
+++ b/ldm/invoke/model_cache.py
@@ -108,7 +108,7 @@ class ModelCache(object):
             if self.config[model_name].get('default'):
                 return model_name
 
-    def set_default_model(self,model_name:str):
+    def set_default_model(self,model_name:str) -> None:
         '''
         Set the default model. The change will not take
         effect until you call model_cache.commit()
@@ -147,7 +147,7 @@ class ModelCache(object):
                     'description': description,
                 }}
     
-    def print_models(self):
+    def print_models(self) -> None:
         '''
         Print a table of models, their descriptions, and load status
         '''
@@ -158,7 +158,7 @@ class ModelCache(object):
                 line = f'\033[1m{line}\033[0m')
             print(line)
 
-    def del_model(self, model_name:str):
+    def del_model(self, model_name:str) -> None:
         '''
         Delete the named model.
         '''
@@ -167,7 +167,7 @@ class ModelCache(object):
         if model_name in self.stack:
             self.stack.remove(model_name)
 
-    def add_model(self, model_name:str, model_attributes:dict, clobber=False):
+    def add_model(self, model_name:str, model_attributes:dict, clobber=False) -> None:
         '''
         Update the named model with a dictionary of attributes. Will fail with an
         assertion error if the name already exists. Pass clobber=True to overwrite.
@@ -269,7 +269,7 @@ class ModelCache(object):
 
         return model, width, height, model_hash
         
-    def offload_model(self, model_name:str):
+    def offload_model(self, model_name:str) -> None:
         '''
         Offload the indicated model to CPU. Will call
         _make_cache_room() to free space if needed.
@@ -306,7 +306,7 @@ class ModelCache(object):
         else:
             print('>> Model Scanned. OK!!')
 
-    def _make_cache_room(self):
+    def _make_cache_room(self) -> None:
         num_loaded_models = len(self.models)
         if num_loaded_models >= self.max_loaded_models:
             least_recent_model = self._pop_oldest_model()
@@ -315,11 +315,11 @@ class ModelCache(object):
                 del self.models[least_recent_model]
                 gc.collect()
         
-    def print_vram_usage(self):
+    def print_vram_usage(self) -> None:
         if self._has_cuda:
             print('>> Current VRAM usage: ','%4.2fG' % (torch.cuda.memory_allocated() / 1e9))
 
-    def commit(self,config_file_path:str):
+    def commit(self,config_file_path:str) -> None:
         '''
         Write current configuration out to the indicated file.
         '''
@@ -330,7 +330,7 @@ class ModelCache(object):
             outfile.write(yaml_str)
         os.replace(tmpfile,config_file_path)
 
-    def preamble(self):
+    def preamble(self) -> str:
         '''
         Returns the preamble for the config file.
         '''
@@ -344,7 +344,7 @@ class ModelCache(object):
             # was trained on.
         ''')
 
-    def _invalidate_cached_model(self,model_name:str):
+    def _invalidate_cached_model(self,model_name:str) -> None:
         self.offload_model(model_name)
         if model_name in self.stack:
             self.stack.remove(model_name)
@@ -376,7 +376,7 @@ class ModelCache(object):
         '''
         return self.stack.pop(0)
 
-    def _push_newest_model(self,model_name:str):
+    def _push_newest_model(self,model_name:str) -> None:
         '''
         Maintain a simple FIFO. First element is always the
         least recent, and last element is always the most recent.
@@ -385,10 +385,10 @@ class ModelCache(object):
             self.stack.remove(model_name)
         self.stack.append(model_name)
         
-    def _has_cuda(self):
+    def _has_cuda(self) -> bool:
         return self.device.type == 'cuda'
 
-    def _cached_sha256(self,path,data):
+    def _cached_sha256(self,path,data) -> str | bytes:
         dirname    = os.path.dirname(path)
         basename   = os.path.basename(path)
         base, _    = os.path.splitext(basename)