Simplify migration scripts management. Make them use static version

- Only make them update config when it's run conditions are satisfies
- Use static schema version to simplify reasoning about run conditions

src/khoj/migrations/migrate_offline_model.py

@@ -13,13 +13,13 @@ def migrate_offline_model(args):
 
     if version_no is None or version.parse(version_no) < version.parse("0.10.1"):
         logger.info(f"Migrating offline model used for version {version_no} to latest version for {args.version_no}")
+        raw_config["version"] = "0.10.1"
 
         # If the user has downloaded the offline model, remove it from the cache.
         offline_model_path = os.path.expanduser("~/.cache/gpt4all/llama-2-7b-chat.ggmlv3.q4_K_S.bin")
         if os.path.exists(offline_model_path):
             os.remove(offline_model_path)
 
-    raw_config["version"] = args.version_no
-    save_config_to_file(raw_config, args.config_file)
+        save_config_to_file(raw_config, args.config_file)
 
     return args

src/khoj/migrations/migrate_processor_config_openai.py

@@ -36,8 +36,6 @@ from khoj.utils.yaml import load_config_from_file, save_config_to_file
 def migrate_processor_conversation_schema(args):
     raw_config = load_config_from_file(args.config_file)
 
-    raw_config["version"] = args.version_no
-
     if "processor" not in raw_config:
         return args
     if raw_config["processor"] is None:
@@ -45,22 +43,24 @@ def migrate_processor_conversation_schema(args):
     if "conversation" not in raw_config["processor"]:
         return args
 
-    # Add enable_offline_chat to khoj config schema
-    if "enable-offline-chat" not in raw_config["processor"]["conversation"]:
-        raw_config["processor"]["conversation"]["enable-offline-chat"] = False
-        save_config_to_file(raw_config, args.config_file)
-
     current_openai_api_key = raw_config["processor"]["conversation"].get("openai-api-key", None)
     current_chat_model = raw_config["processor"]["conversation"].get("chat-model", None)
     if current_openai_api_key is None and current_chat_model is None:
         return args
 
-    conversation_logfile = raw_config["processor"]["conversation"].get("conversation-logfile", None)
+    raw_config["version"] = "0.10.0"
 
+    # Add enable_offline_chat to khoj config schema
+    if "enable-offline-chat" not in raw_config["processor"]["conversation"]:
+        raw_config["processor"]["conversation"]["enable-offline-chat"] = False
+
+    # Update conversation processor schema
+    conversation_logfile = raw_config["processor"]["conversation"].get("conversation-logfile", None)
     raw_config["processor"]["conversation"] = {
         "openai": {"chat-model": current_chat_model, "api-key": current_openai_api_key},
         "conversation-logfile": conversation_logfile,
         "enable-offline-chat": False,
     }
+
     save_config_to_file(raw_config, args.config_file)
     return args

src/khoj/migrations/migrate_version.py

@@ -6,7 +6,7 @@ def migrate_config_to_version(args):
 
     # Add version to khoj config schema
     if "version" not in raw_config:
-        raw_config["version"] = args.version_no
+        raw_config["version"] = "0.9.0"
         save_config_to_file(raw_config, args.config_file)
 
         # regenerate khoj index on first start of this version