diff --git a/tg_bot/application/__init__.py b/tg_bot/application/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tg_bot/application/services/__init__.py b/tg_bot/application/services/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tg_bot/application/services/rag_service.py b/tg_bot/application/services/rag_service.py
new file mode 100644
index 0000000..c5771ed
--- /dev/null
+++ b/tg_bot/application/services/rag_service.py
@@ -0,0 +1,139 @@
+import aiohttp
+from tg_bot.infrastructure.external.deepseek_client import DeepSeekClient
+from tg_bot.config.settings import settings
+
+BACKEND_URL = "http://localhost:8001/api/v1"
+
+
+class RAGService:
+
+    def __init__(self):
+        self.deepseek_client = DeepSeekClient()
+
+    async def search_documents_in_collections(
+            self,
+            user_telegram_id: str,
+            query: str,
+            limit_per_collection: int = 5
+    ) -> list[dict]:
+        try:
+            async with aiohttp.ClientSession() as session:
+                async with session.get(
+                        f"{BACKEND_URL}/users/telegram/{user_telegram_id}"
+                ) as user_response:
+                    if user_response.status != 200:
+                        return []
+
+                    user_data = await user_response.json()
+                    user_uuid = str(user_data.get("user_id"))
+
+                    if not user_uuid:
+                        return []
+
+                async with session.get(
+                        f"{BACKEND_URL}/collections/",
+                        headers={"X-Telegram-ID": user_telegram_id}
+                ) as collections_response:
+                    if collections_response.status != 200:
+                        return []
+
+                    collections = await collections_response.json()
+
+            all_documents = []
+            for collection in collections:
+                collection_id = collection.get("collection_id")
+                if not collection_id:
+                    continue
+
+                try:
+                    async with aiohttp.ClientSession() as search_session:
+                        async with search_session.get(
+                                f"{BACKEND_URL}/documents/collection/{collection_id}",
+                                params={"search": query, "limit": limit_per_collection},
+                                headers={"X-Telegram-ID": user_telegram_id}
+                        ) as search_response:
+                            if search_response.status == 200:
+                                documents = await search_response.json()
+                                for doc in documents:
+                                    doc["collection_name"] = collection.get("name", "Unknown")
+                                    all_documents.append(doc)
+                except Exception as e:
+                    print(f"Error searching collection {collection_id}: {e}")
+                    continue
+
+            return all_documents[:20]
+
+        except Exception as e:
+            print(f"Error searching documents: {e}")
+            return []
+
+    async def generate_answer_with_rag(
+            self,
+            question: str,
+            user_telegram_id: str
+    ) -> dict:
+        documents = await self.search_documents_in_collections(
+            user_telegram_id,
+            question
+        )
+
+        context_parts = []
+        sources = []
+
+        for doc in documents[:5]:
+            title = doc.get("title", "Без названия")
+            content = doc.get("content", "")[:1000]
+            collection_name = doc.get("collection_name", "Unknown")
+
+            context_parts.append(f"Документ: {title}\nКоллекция: {collection_name}\nСодержание: {content[:500]}...")
+            sources.append({
+                "title": title,
+                "collection": collection_name,
+                "document_id": doc.get("document_id")
+            })
+
+        context = "\n\n".join(context_parts) if context_parts else "Релевантные документы не найдены."
+
+        system_prompt = """Ты - помощник-юрист, который отвечает на вопросы на основе предоставленных документов.
+Используй информацию из документов для формирования точного и полезного ответа.
+Если в документах нет информации для ответа, честно скажи об этом."""
+
+        user_prompt = f"""Контекст из документов:
+{context}
+
+Вопрос пользователя: {question}
+
+Ответь на вопрос, используя информацию из предоставленных документов. Если информации недостаточно, укажи это."""
+
+        try:
+            messages = [
+                {"role": "system", "content": system_prompt},
+                {"role": "user", "content": user_prompt}
+            ]
+
+            response = await self.deepseek_client.chat_completion(
+                messages=messages,
+                temperature=0.7,
+                max_tokens=2000
+            )
+
+            return {
+                "answer": response.get("content", "Failed to generate answer"),
+                "sources": sources,
+                "usage": response.get("usage", {})
+            }
+
+        except Exception as e:
+            print(f"Error generating answer: {e}")
+            if documents:
+                return {
+                    "answer": f"Found {len(documents)} documents but failed to generate answer",
+                    "sources": sources[:3],
+                    "usage": {}
+                }
+            else:
+                return {
+                    "answer": "No relevant documents found",
+                    "sources": [],
+                    "usage": {}
+                }
diff --git a/tg_bot/config/settings.py b/tg_bot/config/settings.py
index 9bacdbf..908bfd5 100644
--- a/tg_bot/config/settings.py
+++ b/tg_bot/config/settings.py
@@ -26,6 +26,9 @@ class Settings(BaseSettings):
     YOOKASSA_RETURN_URL: str = "https://t.me/vibelawyer_bot"
     YOOKASSA_WEBHOOK_SECRET: Optional[str] = None
 
+    DEEPSEEK_API_KEY: Optional[str] = None
+    DEEPSEEK_API_URL: str = "https://api.deepseek.com/v1/chat/completions"
+
     ADMIN_IDS_STR: str = ""
 
     @property
diff --git a/tg_bot/domain/__init__.py b/tg_bot/domain/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tg_bot/domain/services/__init__.py b/tg_bot/domain/services/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tg_bot/domain/services/user_service.py b/tg_bot/domain/services/user_service.py
new file mode 100644
index 0000000..17d4e33
--- /dev/null
+++ b/tg_bot/domain/services/user_service.py
@@ -0,0 +1,29 @@
+from sqlalchemy.orm import Session
+from datetime import datetime, timedelta
+from tg_bot.infrastructure.database.models import UserModel
+
+
+class UserService:
+
+    def __init__(self, session: Session):
+        self.session = session
+
+    async def activate_premium(self, telegram_id: int) -> bool:
+        try:
+            user = self.session.query(UserModel) \
+                .filter(UserModel.telegram_id == str(telegram_id)) \
+                .first()
+            if user:
+                user.is_premium = True
+                if user.premium_until and user.premium_until > datetime.now():
+                    user.premium_until = user.premium_until + timedelta(days=30)
+                else:
+                    user.premium_until = datetime.now() + timedelta(days=30)
+                self.session.commit()
+                return True
+            else:
+                return False
+        except Exception as e:
+            print(f"Error activating premium: {e}")
+            self.session.rollback()
+            return False
diff --git a/tg_bot/infrastructure/external/__init__.py b/tg_bot/infrastructure/external/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tg_bot/infrastructure/external/deepseek_client.py b/tg_bot/infrastructure/external/deepseek_client.py
new file mode 100644
index 0000000..68bc3aa
--- /dev/null
+++ b/tg_bot/infrastructure/external/deepseek_client.py
@@ -0,0 +1,172 @@
+import json
+from typing import Optional, AsyncIterator
+import httpx
+from tg_bot.config.settings import settings
+
+
+class DeepSeekAPIError(Exception):
+    pass
+
+
+class DeepSeekClient:
+    
+    def __init__(self, api_key: str | None = None, api_url: str | None = None):
+        self.api_key = api_key or settings.DEEPSEEK_API_KEY
+        self.api_url = api_url or settings.DEEPSEEK_API_URL
+        self.timeout = 60.0
+    
+    def _get_headers(self) -> dict[str, str]:
+        if not self.api_key:
+            raise DeepSeekAPIError("API key not set")
+        
+        return {
+            "Content-Type": "application/json",
+            "Authorization": f"Bearer {self.api_key}"
+        }
+    
+    async def chat_completion(
+        self,
+        messages: list[dict[str, str]],
+        model: str = "deepseek-chat",
+        temperature: float = 0.7,
+        max_tokens: Optional[int] = None,
+        stream: bool = False
+    ) -> dict:
+        if not self.api_key:
+            return {
+                "content": "API key not configured",
+                "usage": {
+                    "prompt_tokens": 0,
+                    "completion_tokens": 0,
+                    "total_tokens": 0
+                }
+            }
+        
+        payload = {
+            "model": model,
+            "messages": messages,
+            "temperature": temperature,
+            "stream": stream
+        }
+        
+        if max_tokens is not None:
+            payload["max_tokens"] = max_tokens
+        
+        try:
+            async with httpx.AsyncClient(timeout=self.timeout) as client:
+                response = await client.post(
+                    self.api_url,
+                    headers=self._get_headers(),
+                    json=payload
+                )
+                response.raise_for_status()
+                
+                data = response.json()
+                
+                if "choices" in data and len(data["choices"]) > 0:
+                    content = data["choices"][0]["message"]["content"]
+                else:
+                    raise DeepSeekAPIError("Invalid response format")
+                
+                usage = data.get("usage", {})
+                
+                return {
+                    "content": content,
+                    "usage": {
+                        "prompt_tokens": usage.get("prompt_tokens", 0),
+                        "completion_tokens": usage.get("completion_tokens", 0),
+                        "total_tokens": usage.get("total_tokens", 0)
+                    }
+                }
+                
+        except httpx.HTTPStatusError as e:
+            error_msg = f"API error: {e.response.status_code}"
+            try:
+                error_data = e.response.json()
+                if "error" in error_data:
+                    error_msg = error_data['error'].get('message', error_msg)
+            except:
+                pass
+            raise DeepSeekAPIError(error_msg) from e
+        except httpx.RequestError as e:
+            raise DeepSeekAPIError(f"Connection error: {str(e)}") from e
+        except Exception as e:
+            raise DeepSeekAPIError(str(e)) from e
+    
+    async def stream_chat_completion(
+        self,
+        messages: list[dict[str, str]],
+        model: str = "deepseek-chat",
+        temperature: float = 0.7,
+        max_tokens: Optional[int] = None
+    ) -> AsyncIterator[str]:
+        if not self.api_key:
+            yield "API key not configured"
+            return
+        
+        payload = {
+            "model": model,
+            "messages": messages,
+            "temperature": temperature,
+            "stream": True
+        }
+        
+        if max_tokens is not None:
+            payload["max_tokens"] = max_tokens
+        
+        try:
+            async with httpx.AsyncClient(timeout=self.timeout) as client:
+                async with client.stream(
+                    "POST",
+                    self.api_url,
+                    headers=self._get_headers(),
+                    json=payload
+                ) as response:
+                    response.raise_for_status()
+                    
+                    async for line in response.aiter_lines():
+                        if not line.strip():
+                            continue
+                        
+                        if line.startswith("data: "):
+                            line = line[6:]
+                        
+                        if line.strip() == "[DONE]":
+                            break
+                        
+                        try:
+                            data = json.loads(line)
+                            
+                            if "choices" in data and len(data["choices"]) > 0:
+                                delta = data["choices"][0].get("delta", {})
+                                content = delta.get("content", "")
+                                if content:
+                                    yield content
+                        except json.JSONDecodeError:
+                            continue
+                            
+        except httpx.HTTPStatusError as e:
+            error_msg = f"API error: {e.response.status_code}"
+            try:
+                error_data = e.response.json()
+                if "error" in error_data:
+                    error_msg = error_data['error'].get('message', error_msg)
+            except:
+                pass
+            raise DeepSeekAPIError(error_msg) from e
+        except httpx.RequestError as e:
+            raise DeepSeekAPIError(f"Connection error: {str(e)}") from e
+        except Exception as e:
+            raise DeepSeekAPIError(str(e)) from e
+    
+    async def health_check(self) -> bool:
+        if not self.api_key:
+            return False
+        
+        try:
+            test_messages = [{"role": "user", "content": "test"}]
+            await self.chat_completion(test_messages, max_tokens=1)
+            return True
+        except Exception:
+            return False
+
diff --git a/tg_bot/infrastructure/telegram/bot.py b/tg_bot/infrastructure/telegram/bot.py
index 9f7a44b..55596c6 100644
--- a/tg_bot/infrastructure/telegram/bot.py
+++ b/tg_bot/infrastructure/telegram/bot.py
@@ -7,7 +7,8 @@ from tg_bot.config.settings import settings
 from tg_bot.infrastructure.telegram.handlers import (
     start_handler,
     help_handler,
-    stats_handler
+    stats_handler,
+    question_handler
 )
 
 logger = logging.getLogger(__name__)
@@ -22,6 +23,7 @@ async def create_bot() -> tuple[Bot, Dispatcher]:
     dp.include_router(start_handler.router)
     dp.include_router(help_handler.router)
     dp.include_router(stats_handler.router)
+    dp.include_router(question_handler.router)
     return bot, dp
 
 
diff --git a/tg_bot/infrastructure/telegram/handlers/question_handler.py b/tg_bot/infrastructure/telegram/handlers/question_handler.py
new file mode 100644
index 0000000..b2b45f0
--- /dev/null
+++ b/tg_bot/infrastructure/telegram/handlers/question_handler.py
@@ -0,0 +1,306 @@
+from aiogram import Router, types
+from aiogram.types import Message
+from datetime import datetime
+import aiohttp
+from tg_bot.config.settings import settings
+from tg_bot.infrastructure.database.database import SessionLocal
+from tg_bot.infrastructure.database.models import UserModel
+from tg_bot.application.services.rag_service import RAGService
+
+router = Router()
+BACKEND_URL = "http://localhost:8001/api/v1"
+rag_service = RAGService()
+
+@router.message()
+async def handle_question(message: Message):
+    user_id = message.from_user.id
+    question_text = message.text.strip()
+    if question_text.startswith('/'):
+        return
+
+    session = SessionLocal()
+    try:
+        user = session.query(UserModel).filter_by(
+            telegram_id=str(user_id)
+        ).first()
+
+        if not user:
+            user = UserModel(
+                telegram_id=str(user_id),
+                username=message.from_user.username or "",
+                first_name=message.from_user.first_name or "",
+                last_name=message.from_user.last_name or ""
+            )
+            session.add(user)
+            session.commit()
+            
+            await ensure_user_in_backend(str(user_id), message.from_user)
+
+        if user.is_premium:
+            await process_premium_question(message, user, question_text, session)
+
+        elif user.questions_used < settings.FREE_QUESTIONS_LIMIT:
+            await process_free_question(message, user, question_text, session)
+
+        else:
+            await handle_limit_exceeded(message, user)
+
+    except Exception as e:
+        print(f"Error processing question: {e}")
+        await message.answer(
+            "Произошла ошибка. Попробуйте позже.",
+            parse_mode="HTML"
+        )
+    finally:
+        session.close()
+
+
+async def ensure_user_in_backend(telegram_id: str, telegram_user):
+    try:
+        async with aiohttp.ClientSession() as session:
+            async with session.get(
+                f"{BACKEND_URL}/users/telegram/{telegram_id}"
+            ) as response:
+                if response.status == 200:
+                    return
+                
+                async with session.post(
+                    f"{BACKEND_URL}/users",
+                    json={"telegram_id": telegram_id, "role": "user"}
+                ) as create_response:
+                    if create_response.status in [200, 201]:
+                        print(f"Пользователь {telegram_id} создан в backend")
+    except Exception as e:
+        print(f"Error creating user in backend: {e}")
+
+
+async def process_premium_question(message: Message, user: UserModel, question_text: str, session):
+    user.questions_used += 1
+    session.commit()
+
+    await message.bot.send_chat_action(message.chat.id, "typing")
+    
+    try:
+        rag_result = await rag_service.generate_answer_with_rag(
+            question_text,
+            str(message.from_user.id)
+        )
+        
+        answer = rag_result.get("answer", "Извините, не удалось сгенерировать ответ.")
+        sources = rag_result.get("sources", [])
+        
+        await save_conversation_to_backend(
+            str(message.from_user.id),
+            question_text,
+            answer,
+            sources
+        )
+        
+        response = (
+            f"<b>Ваш вопрос:</b>\n"
+            f"<i>{question_text[:200]}</i>\n\n"
+            f"<b>Ответ:</b>\n{answer}\n\n"
+        )
+        
+        if sources:
+            response += f"<b>Источники из коллекций:</b>\n"
+            collections_used = {}
+            for source in sources[:5]:
+                collection_name = source.get('collection', 'Неизвестно')
+                if collection_name not in collections_used:
+                    collections_used[collection_name] = []
+                collections_used[collection_name].append(source.get('title', 'Без названия'))
+            
+            for i, (collection_name, titles) in enumerate(collections_used.items(), 1):
+                response += f"{i}. <b>Коллекция:</b> {collection_name}\n"
+                for title in titles[:2]:
+                    response += f"   • {title}\n"
+            response += "\n<i>Используйте /mycollections для просмотра всех коллекций</i>\n\n"
+        
+        response += (
+            f"<b>Статус:</b> Premium (вопросов безлимитно)\n"
+            f"<b>Всего вопросов:</b> {user.questions_used}"
+        )
+        
+    except Exception as e:
+        print(f"Error generating answer: {e}")
+        response = (
+            f"<b>Ваш вопрос:</b>\n"
+            f"<i>{question_text[:200]}</i>\n\n"
+            f"Ошибка при генерации ответа. Попробуйте позже.\n\n"
+            f"<b>Статус:</b> Premium\n"
+            f"<b>Всего вопросов:</b> {user.questions_used}"
+        )
+
+    await message.answer(response, parse_mode="HTML")
+
+
+async def process_free_question(message: Message, user: UserModel, question_text: str, session):
+    user.questions_used += 1
+    remaining = settings.FREE_QUESTIONS_LIMIT - user.questions_used
+    session.commit()
+
+    await message.bot.send_chat_action(message.chat.id, "typing")
+    
+    try:
+        rag_result = await rag_service.generate_answer_with_rag(
+            question_text,
+            str(message.from_user.id)
+        )
+        
+        answer = rag_result.get("answer", "Извините, не удалось сгенерировать ответ.")
+        sources = rag_result.get("sources", [])
+        
+        await save_conversation_to_backend(
+            str(message.from_user.id),
+            question_text,
+            answer,
+            sources
+        )
+        
+        response = (
+            f"<b>Ваш вопрос:</b>\n"
+            f"<i>{question_text[:200]}</i>\n\n"
+            f"<b>Ответ:</b>\n{answer}\n\n"
+        )
+        
+        if sources:
+            response += f"<b>Источники из коллекций:</b>\n"
+            collections_used = {}
+            for source in sources[:5]:
+                collection_name = source.get('collection', 'Неизвестно')
+                if collection_name not in collections_used:
+                    collections_used[collection_name] = []
+                collections_used[collection_name].append(source.get('title', 'Без названия'))
+            
+            for i, (collection_name, titles) in enumerate(collections_used.items(), 1):
+                response += f"{i}. <b>Коллекция:</b> {collection_name}\n"
+                for title in titles[:2]:
+                    response += f"   • {title}\n"
+            response += "\n<i>Используйте /mycollections для просмотра всех коллекций</i>\n\n"
+        
+        response += (
+            f"<b>Статус:</b> Бесплатный доступ\n"
+            f"<b>Использовано вопросов:</b> {user.questions_used}/{settings.FREE_QUESTIONS_LIMIT}\n"
+            f"<b>Осталось бесплатных:</b> {remaining}\n\n"
+        )
+
+        if remaining <= 3 and remaining > 0:
+            response += f"<i>Осталось мало вопросов! Для продолжения используйте /buy</i>\n\n"
+
+        response += f"<i>Для безлимитного доступа: /buy</i>"
+        
+    except Exception as e:
+        print(f"Error generating answer: {e}")
+        response = (
+            f"<b>Ваш вопрос:</b>\n"
+            f"<i>{question_text[:200]}</i>\n\n"
+            f"Ошибка при генерации ответа. Попробуйте позже.\n\n"
+            f"<b>Статус:</b> Бесплатный доступ\n"
+            f"<b>Использовано вопросов:</b> {user.questions_used}/{settings.FREE_QUESTIONS_LIMIT}\n"
+            f"<b>Осталось бесплатных:</b> {remaining}\n\n"
+            f"<i>Для безлимитного доступа: /buy</i>"
+        )
+
+    await message.answer(response, parse_mode="HTML")
+
+
+async def save_conversation_to_backend(telegram_id: str, question: str, answer: str, sources: list):
+    try:
+        async with aiohttp.ClientSession() as session:
+            async with session.get(
+                f"{BACKEND_URL}/users/telegram/{telegram_id}"
+            ) as user_response:
+                if user_response.status != 200:
+                    return
+                user_data = await user_response.json()
+                user_uuid = user_data.get("user_id")
+            
+            async with session.get(
+                f"{BACKEND_URL}/collections/",
+                headers={"X-Telegram-ID": telegram_id}
+            ) as collections_response:
+                collections = []
+                if collections_response.status == 200:
+                    collections = await collections_response.json()
+            
+            collection_id = None
+            if collections:
+                collection_id = collections[0].get("collection_id")
+            else:
+                async with session.post(
+                    f"{BACKEND_URL}/collections",
+                    json={
+                        "name": "Основная коллекция",
+                        "description": "Коллекция по умолчанию",
+                        "is_public": False
+                    },
+                    headers={"X-Telegram-ID": telegram_id}
+                ) as create_collection_response:
+                    if create_collection_response.status in [200, 201]:
+                        collection_data = await create_collection_response.json()
+                        collection_id = collection_data.get("collection_id")
+            
+            if not collection_id:
+                return
+            
+            async with session.post(
+                f"{BACKEND_URL}/conversations",
+                json={"collection_id": str(collection_id)},
+                headers={"X-Telegram-ID": telegram_id}
+            ) as conversation_response:
+                if conversation_response.status not in [200, 201]:
+                    return
+                conversation_data = await conversation_response.json()
+                conversation_id = conversation_data.get("conversation_id")
+            
+            if not conversation_id:
+                return
+            
+            await session.post(
+                f"{BACKEND_URL}/messages",
+                json={
+                    "conversation_id": str(conversation_id),
+                    "content": question,
+                    "role": "user"
+                },
+                headers={"X-Telegram-ID": telegram_id}
+            )
+            
+            await session.post(
+                f"{BACKEND_URL}/messages",
+                json={
+                    "conversation_id": str(conversation_id),
+                    "content": answer,
+                    "role": "assistant",
+                    "sources": {"documents": sources}
+                },
+                headers={"X-Telegram-ID": telegram_id}
+            )
+            
+    except Exception as e:
+        print(f"Error saving conversation: {e}")
+
+
+async def handle_limit_exceeded(message: Message, user: UserModel):
+    response = (
+        f"<b>Лимит бесплатных вопросов исчерпан!</b>\n\n"
+
+        f"<b>Ваша статистика:</b>\n"
+        f"• Использовано вопросов: {user.questions_used}\n"
+        f"• Бесплатный лимит: {settings.FREE_QUESTIONS_LIMIT}\n\n"
+
+        f"<b>Что делать дальше?</b>\n"
+        f"1. Купите подписку командой /buy\n"
+        f"2. Получите неограниченный доступ к вопросам\n"
+        f"3. Продолжайте использовать бот без ограничений\n\n"
+
+        f"<b>Подписка включает:</b>\n"
+        f"• Неограниченное количество вопросов\n"
+        f"• Приоритетную обработку\n"
+        f"• Доступ ко всем функциям\n\n"
+
+        f"<b>Нажмите /buy чтобы продолжить</b>"
+    )
+
+    await message.answer(response, parse_mode="HTML")