fix: add error handler and resilient reply to prevent crash on deleted messages

main.py

@@ -11,6 +11,7 @@ import subprocess
 
 from openai import OpenAI
 from telegram import BotCommand, Update
+from telegram.error import BadRequest, TimedOut
 from telegram.ext import (
     ApplicationBuilder,
     CommandHandler,
@@ -345,7 +346,7 @@ async def handle_message(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None
             )
         except Exception as e:
             log.error("OpenAI API error: %s", e)
-            await update.message.reply_text(f"Sorry, I hit an error: {e}")
+            await _safe_reply(update, f"Sorry, I hit an error: {e}")
             return
 
         choice = response.choices[0]
@@ -381,14 +382,31 @@ async def handle_message(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None
             if len(messages) > 60:
                 messages[:] = messages[:1] + messages[-40:]
 
-            await update.message.reply_text(msg.content)
+            await _safe_reply(update, msg.content)
         return
 
-    await update.message.reply_text(
-        "I ran out of steps — please try again with a simpler request."
+    await _safe_reply(
+        update, "I ran out of steps — please try again with a simpler request."
     )
 
 
+async def _safe_reply(update: Update, text: str, **kwargs) -> None:
+    """Reply to a message, falling back to send_message if the original is gone."""
+    try:
+        await update.message.reply_text(text, **kwargs)
+    except BadRequest:
+        log.warning("Could not reply to message, sending without reply")
+        await update.effective_chat.send_message(text, **kwargs)
+
+
+async def _error_handler(update: object, context: ContextTypes.DEFAULT_TYPE) -> None:
+    """Log errors and keep the bot running."""
+    if isinstance(context.error, TimedOut):
+        log.warning("Telegram request timed out")
+        return
+    log.error("Unhandled exception: %s", context.error, exc_info=context.error)
+
+
 # ---------------------------------------------------------------------------
 # Main
 # ---------------------------------------------------------------------------
@@ -397,13 +415,16 @@ def main() -> None:
     app.add_handler(CommandHandler("start", cmd_start))
     app.add_handler(CommandHandler("reset", cmd_reset))
     app.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, handle_message))
+    app.add_error_handler(_error_handler)
 
     # Register bot commands for the / menu
     async def post_init(application) -> None:
-        await application.bot.set_my_commands([
-            BotCommand("start", "Show welcome message"),
-            BotCommand("reset", "Reset conversation"),
-        ])
+        await application.bot.set_my_commands(
+            [
+                BotCommand("start", "Show welcome message"),
+                BotCommand("reset", "Reset conversation"),
+            ]
+        )
         log.info("Bot commands registered")
 
     app.post_init = post_init