v1.7.1: fix all P1-P4, C1-C6, H1-H6, M1-M7, L1-L3 from error.md — async migrations, CSS variables, SQL validation, event loop, prompt injection, VCF parsing, race conditions, unused imports, gitignore

max_bot/app/handlers/greeting.py

@@ -37,16 +37,35 @@ async def handle_greeting(
 
         now = datetime.datetime.utcnow()
         if not user:
-            user = BotUser(
-                id=user_id,
-                first_name=first_name,
-                last_name=last_name,
-                username=username,
-                last_interaction=now,
-                total_conversations=1,
-                created_at=now,
-            )
-            db.add(user)
+            try:
+                user = BotUser(
+                    id=user_id,
+                    first_name=first_name,
+                    last_name=last_name,
+                    username=username,
+                    last_interaction=now,
+                    total_conversations=1,
+                    created_at=now,
+                )
+                db.add(user)
+                await db.commit()
+                await db.refresh(user)
+            except Exception:
+                await db.rollback()
+                existing = await db.execute(
+                    select(BotUser).where(BotUser.id == user_id)
+                )
+                user = existing.scalar_one_or_none()
+                if user:
+                    if first_name:
+                        user.first_name = first_name
+                    if last_name:
+                        user.last_name = last_name
+                    if username:
+                        user.username = username
+                    user.last_interaction = now
+                    user.total_conversations = (user.total_conversations or 0) + 1
+                    await db.commit()
         else:
             if first_name:
                 user.first_name = first_name
@@ -56,9 +75,7 @@ async def handle_greeting(
                 user.username = username
             user.last_interaction = now
             user.total_conversations = (user.total_conversations or 0) + 1
-
-        await db.commit()
-        await db.refresh(user)
+            await db.commit()
 
         conv = BotConversation(
             user_id=user_id,