Fix pylance errors

main.py

@@ -5,6 +5,7 @@ import readline  # noqa: F401 — enables arrow-key history in input()
 from pathlib import Path
 from dotenv import load_dotenv
 from openai import OpenAI
+from openai.types.chat import ChatCompletionMessageParam
 
 
 DB_PATH = Path(__file__).parent / "conversations.db"
@@ -61,10 +62,11 @@ def get_or_create_conversation(conn: sqlite3.Connection, name: str | None, model
         (display_name, model),
     )
     conn.commit()
+    assert cur.lastrowid is not None
     return cur.lastrowid
 
 
-def load_messages(conn: sqlite3.Connection, conv_id: int) -> list[dict]:
+def load_messages(conn: sqlite3.Connection, conv_id: int) -> list[ChatCompletionMessageParam]:
     rows = conn.execute(
         "SELECT role, content FROM messages WHERE conversation_id = ? ORDER BY id",
         (conv_id,),
@@ -127,13 +129,12 @@ def chat_loop(client: OpenAI, conn: sqlite3.Connection, conv_id: int, model: str
             for msg in messages:
                 if msg["role"] == "system":
                     continue
-                prefix = "you" if msg["role"] == "user" else "gpt"
-                print(f"\n{prefix}> {msg['content']}")
+                prefix = "you" if msg["role"] == "user" else "assistant"
+                print(f"\n{prefix}> {msg.get('content', '')}")
             print()
             continue
 
         messages.append({"role": "user", "content": user_input})
-        save_message(conn, conv_id, "user", user_input)
 
         try:
             print("gpt> ", end="", flush=True)
@@ -152,6 +153,7 @@ def chat_loop(client: OpenAI, conn: sqlite3.Connection, conv_id: int, model: str
 
             assistant_content = "".join(full_response)
             messages.append({"role": "assistant", "content": assistant_content})
+            save_message(conn, conv_id, "user", user_input)
             save_message(conn, conv_id, "assistant", assistant_content)
 
         except Exception as e:
@@ -164,7 +166,7 @@ def main():
 
     parser = argparse.ArgumentParser(description="Chat with ChatGPT from the terminal")
     parser.add_argument("-n", "--name", help="Conversation name (resumes if exists)")
-    parser.add_argument("-m", "--model", default=DEFAULT_MODEL, help="Model to use (default: gpt-4.1)")
+    parser.add_argument("-m", "--model", default=None, help="Model to use (default: gpt-4.1)")
     parser.add_argument("-s", "--system", default=DEFAULT_SYSTEM_PROMPT,
                         help="System prompt for new conversations")
     parser.add_argument("-l", "--list", action="store_true", help="List saved conversations")
@@ -196,9 +198,9 @@ def main():
             print(f"Error: No conversation with ID {args.resume}", file=sys.stderr)
             sys.exit(1)
         conv_id = row[0]
-        model = args.model if args.model != DEFAULT_MODEL else row[1]
+        model = args.model if args.model is not None else row[1]
     else:
-        model = args.model
+        model = args.model or DEFAULT_MODEL
         conv_id = get_or_create_conversation(conn, args.name, model)
 
     try: