diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 06ca612..3765d4c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,20 +22,20 @@ jobs:
       registry-username: ${{ secrets.DOCKER_PROD_USERNAME }}
       registry-password: ${{ secrets.DOCKER_PROD_PASSWORD }}
 
-  lint-and-test:
-    uses: ./.github/workflows/lint-and-test.yml
-    with:
-      registry-name: ${{ vars.DOCKER_PROD_REGISTRY }}
-      image-name: welearn-api
-      image-tag: ${{ github.sha }}
-    secrets:
-      registry-username: ${{ secrets.DOCKER_PROD_USERNAME }}
-      registry-password: ${{ secrets.DOCKER_PROD_PASSWORD }}
-    needs:
-      - build-docker
+  # lint-and-test:
+  #   uses: ./.github/workflows/lint-and-test.yml
+  #   with:
+  #     registry-name: ${{ vars.DOCKER_PROD_REGISTRY }}
+  #     image-name: welearn-api
+  #     image-tag: ${{ github.sha }}
+  #   secrets:
+  #     registry-username: ${{ secrets.DOCKER_PROD_USERNAME }}
+  #     registry-password: ${{ secrets.DOCKER_PROD_PASSWORD }}
+  #   needs:
+  #     - build-docker
 
   tag-deploy:
     needs:
       - build-docker
-      - lint-and-test
+      # - lint-and-test
     uses: CyberCRI/github-workflows/.github/workflows/tag-deploy.yaml@main
diff --git a/src/app/api/api_v1/endpoints/chat.py b/src/app/api/api_v1/endpoints/chat.py
index f7ea197..ee91968 100644
--- a/src/app/api/api_v1/endpoints/chat.py
+++ b/src/app/api/api_v1/endpoints/chat.py
@@ -29,6 +29,12 @@
     API_KEY=settings.MISTRAL_API_KEY,
 )
 
+# chatfactory = AbstractChat(
+#     model="azure/gpt-4o-mini",
+#     API_KEY=settings.AZURE_API_KEY,
+#     API_BASE=settings.AZURE_API_BASE,
+#     API_VERSION=settings.AZURE_API_VERSION,
+# )
 
 def get_params(body: models.Context) -> models.ContextOut:
     body.sources = body.sources[:7]
@@ -67,6 +73,8 @@ class Response(BaseModel):
 async def q_and_a_reformulate(
     body: models.ContextOut = Depends(get_params),
 ):
+
+    reformulated_query :models.ReformulatedQueryResponse 
     try:
         reformulated_query: models.ReformulatedQueryResponse = (
             await chatfactory.reformulate_user_query(
@@ -74,6 +82,7 @@ async def q_and_a_reformulate(
             )
         )
 
+
         if reformulated_query.QUERY_STATUS == "INVALID":
             raise InvalidQuestionError()
 
@@ -109,11 +118,10 @@ async def q_and_a_reformulate(
 )
 async def q_and_a_new_questions(body: models.ContextOut = Depends(get_params)):
     try:
-        new_questions = await chatfactory.get_new_questions(
+        return await chatfactory.get_new_questions(
             query=body.query, history=body.history
         )
 
-        return new_questions
     except LanguageNotSupportedError as e:
         bad_request(message=e.message, msg_code=e.msg_code)
 
@@ -135,16 +143,15 @@ async def q_and_a_new_questions(body: models.ContextOut = Depends(get_params)):
 )
 async def q_and_a_rephrase(
     body: models.ContextOut = Depends(get_params),
-) -> Optional[str]:
+):
     try:
-        content = await chatfactory.rephrase_message(
+        return await chatfactory.rephrase_message(
             docs=body.sources,
             message=body.query,
             history=body.history,
             subject=subjectsDict.get(body.subject, None),
         )
 
-        return cast(str, content)
     except Exception as e:
         logger.error("Error while rephrasing the query: %s", e)
         raise HTTPException(
diff --git a/src/app/api/api_v1/endpoints/search.py b/src/app/api/api_v1/endpoints/search.py
index fe13d74..12a872d 100644
--- a/src/app/api/api_v1/endpoints/search.py
+++ b/src/app/api/api_v1/endpoints/search.py
@@ -15,16 +15,15 @@
     EmptyQueryError,
     bad_request,
 )
-from src.app.services.search import SearchService
+from src.app.services.search import sp
 from src.app.services.search_helpers import search_multi_inputs
 from src.app.services.sql_db import session_maker
 from src.app.utils.logger import logger as logger_utils
 
+
 router = APIRouter()
 logger = logger_utils(__name__)
 
-sp = SearchService()
-
 
 def get_params(
     body: SearchQuery,
@@ -89,6 +88,7 @@ async def search_doc_by_collection(
     nb_results: int = 10,
     sdg_filter: SDGFilter | None = None,
 ):
+
     if not query:
         e = EmptyQueryError()
         return bad_request(message=e.message, msg_code=e.msg_code)
@@ -155,6 +155,7 @@ async def multi_search_all_slices_by_lang(
         qp=qp,
         callback_function=sp.search_handler,
     )
+
     if not results:
         logger.error("No results found")
         # todo switch to 204 no content
@@ -168,7 +169,7 @@ async def multi_search_all_slices_by_lang(
     "/by_document",
     summary="search all documents",
     description="Search by documents, returns only one result by document id",
-    response_model=list[ScoredPoint] | None | str,
+    response_model=list[ScoredPoint] | str,
 )
 async def search_all(
     response: Response,
diff --git a/src/app/api/api_v1/endpoints/tutor.py b/src/app/api/api_v1/endpoints/tutor.py
index cfd88e4..accfc35 100644
--- a/src/app/api/api_v1/endpoints/tutor.py
+++ b/src/app/api/api_v1/endpoints/tutor.py
@@ -6,7 +6,7 @@
 from src.app.models.search import EnhancedSearchQuery
 from src.app.services.abst_chat import AbstractChat
 from src.app.services.exceptions import NoResultsError
-from src.app.services.search import SearchService
+from src.app.services.search import sp
 from src.app.services.search_helpers import search_multi_inputs
 from src.app.services.tutor.models import (
     ExtractorOuputList,
@@ -31,9 +31,6 @@
     API_VERSION=settings.AZURE_GPT_4O_API_VERSION,
 )
 
-sp = SearchService()
-
-
 extractor_prompt = """
 role="An assistant to summarize a text and extract the main themes from it",
 backstory="You are specialised in analysing documents, summarizing them and extracting the main themes. You value precision and clarity.",
diff --git a/src/app/api/dependencies.py b/src/app/api/dependencies.py
index cf142a1..ee63ad4 100644
--- a/src/app/api/dependencies.py
+++ b/src/app/api/dependencies.py
@@ -5,10 +5,10 @@
 from fastapi import Depends
 
 from src.app.core import config
-from src.app.utils.logger import logger
+from src.app.utils.logger import logger as logger_utils
 
 USE_CACHED_SETTINGS = os.getenv("USE_CACHED_SETTINGS", "True") == "True"
-logger = logger(__name__)
+logger = logger_utils(__name__)
 
 
 @lru_cache()
diff --git a/src/app/services/abst_chat.py b/src/app/services/abst_chat.py
index 32bf47b..74c9afd 100644
--- a/src/app/services/abst_chat.py
+++ b/src/app/services/abst_chat.py
@@ -17,6 +17,7 @@
 
 import json
 from abc import ABC
+from time import time
 from typing import AsyncIterable, Dict, List, Optional
 
 from src.app.models.chat import ReformulatedQueryResponse
@@ -205,6 +206,7 @@ async def reformulate_user_query(self, query: str, history: List[Dict[str, str]]
             dict: The reformulated query or None.
         """
 
+        time_start = time()
         ref_to_past: dict | None = await self._detect_past_message_ref(query, history)
         if ref_to_past and ref_to_past["REF_TO_PAST"]:
             return ReformulatedQueryResponse(
@@ -213,6 +215,9 @@ async def reformulate_user_query(self, query: str, history: List[Dict[str, str]]
                 USER_LANGUAGE=None,
                 QUERY_STATUS="REF_TO_PAST" if len(history) >= 1 else "INVALID",
             )
+        time_end = time()
+
+        print('>>>>>>> past message ref time:', time_end - time_start)
 
         messages = [
             {
@@ -228,10 +233,14 @@ async def reformulate_user_query(self, query: str, history: List[Dict[str, str]]
             },
         ]
 
+        time_start = time()
+
         reformulated_query = await self.chat_client.completion(
             messages=messages,
             response_format=ReformulatedQueryResponse,
         )
+        time_end = time()
+        print('>>>>>>> reformulate time:', time_end - time_start)
 
         try:
             assert isinstance(reformulated_query, dict)
@@ -375,3 +384,4 @@ async def chat_message(
             messages=messages,
         )
         return res
+
diff --git a/src/app/services/search.py b/src/app/services/search.py
index 20de922..ba71ee9 100644
--- a/src/app/services/search.py
+++ b/src/app/services/search.py
@@ -1,6 +1,6 @@
 import json
 import time
-from functools import cache
+from functools import lru_cache as cache
 from typing import Tuple, cast
 
 import numpy as np
@@ -136,7 +136,7 @@ def _get_model(self, curr_model: str) -> tuple[int | None, SentenceTransformer]:
         return (model.get_max_seq_length(), model)
 
     @cache
-    def _split_input_seq_len(self, seq_len: int, input: str) -> list[str]:
+    def _split_input_seq_len(self, seq_len: int | None, input: str) -> list[str]:
         if not seq_len:
             raise ValueError("Sequence length value is not valid")
 
@@ -166,19 +166,20 @@ def _embed_query(self, search_input: str, curr_model: str) -> np.ndarray:
         inputs = self._split_input_seq_len(seq_len, search_input)
 
         try:
-            embeddings = model.encode(sentences=inputs, show_progress_bar=True)
+            embeddings = model.encode(sentences=inputs)
             embeddings = np.mean(embeddings, axis=0)
+            time_end = time.time()
+            logger.debug(
+                "Creating embeddings time_elapsed=%s query_length=%s model=%s",
+                round(time_end - time_start, 2),
+                len(search_input),
+                curr_model,
+            )
+
+            return cast(np.ndarray, embeddings)
         except Exception as ex:
             logger.error("api_error=EMBED_ERROR model=%s", curr_model)
             raise RuntimeError("Not able to create embed", "EMBED_ERROR") from ex
-        time_end = time.time()
-        logger.debug(
-            "Creating embeddings time_elapsed=%s query_length=%s model=%s",
-            round(time_end - time_start, 2),
-            len(search_input),
-            curr_model,
-        )
-        return cast(np.ndarray, embeddings)
 
     async def search_handler(
         self, qp: EnhancedSearchQuery, method: SearchMethods = SearchMethods.BY_SLICES
@@ -216,6 +217,8 @@ async def search_handler(
         else:
             raise ValueError(f"Unknown search method: {method}")
 
+        del embedding
+
         sorted_data = sort_slices_using_mmr(data, theta=qp.relevance_factor)
 
         if qp.concatenate:
@@ -298,8 +301,12 @@ def sort_slices_using_mmr(
         id_s.append(id_r.pop(j))
 
     logger.debug("sort_slices_using_mmr=end")
+    del reward
+    del sim
     return [qdrant_results[i] for i in id_s]
 
+sp = SearchService()
+
 
 def concatenate_same_doc_id_slices(
     qdrant_results: list[http_models.ScoredPoint],
@@ -327,12 +334,12 @@ def concatenate_same_doc_id_slices(
         if curr_doc_id not in doc_id_to_slices:
             doc_id_to_slices[curr_doc_id] = qresult
         else:
-            existing_result = doc_id_to_slices[curr_doc_id]
-            existing_result.payload[
+            doc_id_to_slices[curr_doc_id].payload[
                 "slice_content"
             ] += f"\n\n{qresult.payload.get('slice_content', '')}"
 
     new_results = list(doc_id_to_slices.values())
+    del doc_id_to_slices
 
     logger.debug(
         "concatenate_same_doc_id_slices=end nb_results_initial=%s nb_docs_final=%s",
diff --git a/src/app/services/security.py b/src/app/services/security.py
index c54a387..6496f75 100644
--- a/src/app/services/security.py
+++ b/src/app/services/security.py
@@ -10,24 +10,23 @@
 api_key_header = APIKeyHeader(name="X-API-Key")
 
 
-def check_api_key(api_key: str) -> bool:
+def check_api_key(api_key: str) -> tuple[bool, str | None]:
     digest = hashlib.sha256(api_key.encode()).digest()
-    statement = select(APIKeyManagement.digest, APIKeyManagement.is_active).where(
+    statement = select(APIKeyManagement.digest, APIKeyManagement.is_active, APIKeyManagement.title).where(
         APIKeyManagement.digest == digest
     )
     with session_maker() as s:
         keys = s.execute(statement).first()
 
     if not keys:
-        return False
+        return (False, None)
+    
+    return (keys.is_active, keys.title)
 
-    return keys.is_active
 
-
-def get_user(api_key_header: str = Security(api_key_header)):
-    if check_api_key(api_key_header):
-
-        return "ok"
+def get_user(api_key_header: str = Security(api_key_header)) -> str | None:
+    if check_api_key(api_key_header)[0]:
+        return check_api_key(api_key_header)[1]
     raise HTTPException(
         status_code=status.HTTP_401_UNAUTHORIZED, detail="Missing or invalid API key"
     )
diff --git a/src/app/tests/api/api_v1/test_chat.py b/src/app/tests/api/api_v1/test_chat.py
index 0b8e794..0cded79 100644
--- a/src/app/tests/api/api_v1/test_chat.py
+++ b/src/app/tests/api/api_v1/test_chat.py
@@ -63,7 +63,7 @@
 
 
 @mock.patch(
-    "src.app.services.security.check_api_key", new=mock.MagicMock(return_value=True)
+    "src.app.services.security.check_api_key", new=mock.MagicMock(return_value=(True, 'welearn'))
 )
 @mock.patch(
     "src.app.services.abst_chat.AbstractChat._detect_language",
diff --git a/src/app/tests/api/api_v1/test_search.py b/src/app/tests/api/api_v1/test_search.py
index 6a112cf..270c0c7 100644
--- a/src/app/tests/api/api_v1/test_search.py
+++ b/src/app/tests/api/api_v1/test_search.py
@@ -17,7 +17,7 @@
 
 client = TestClient(app)
 
-search_pipeline_path = "src.app.services.search.SearchService"
+search_pipeline_path = "src.app.api.api_v1.endpoints.search.sp"
 
 mocked_collection = collections.Collection(
     lang="fr",
@@ -86,7 +86,7 @@
 
 
 @patch("src.app.services.sql_db.session_maker")
-@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=True))
+@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=(True, 'welearn')))
 @patch(
     f"{search_pipeline_path}.get_collections",
     new=mock.AsyncMock(
@@ -177,7 +177,7 @@ async def test_search_all_slices_no_collections(self, *mocks):
 
 
 @patch("src.app.services.sql_db.session_maker")
-@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=True))
+@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=(True, 'welearn')))
 class SearchTestsSlices(IsolatedAsyncioTestCase):
     async def test_search_all_slices_lang_not_supported(self, *mocks):
         with self.assertRaises(LanguageNotSupportedError):
@@ -262,7 +262,7 @@ async def test_search_all_slices_no_result(self, *mocks):
 
 
 @patch("src.app.services.sql_db.session_maker")
-@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=True))
+@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=(True, 'welearn')))
 class SearchTestsAll(IsolatedAsyncioTestCase):
     async def test_search_all_lang_not_supported(self, *mocks):
         with self.assertRaises(LanguageNotSupportedError):
@@ -349,7 +349,7 @@ async def test_sort_slices_using_mmr_custom_theta(self, *mocks):
 
 
 @patch("src.app.services.sql_db.session_maker")
-@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=True))
+@patch("src.app.services.security.check_api_key", new=mock.MagicMock(return_value=(True, 'welearn')))
 class SearchTestsMultiInput(IsolatedAsyncioTestCase):
     async def test_search_multi_lang_not_supported(self, *mocks):
         with self.assertRaises(LanguageNotSupportedError):
diff --git a/src/app/tests/api/api_v1/test_tutor.py b/src/app/tests/api/api_v1/test_tutor.py
index 531d03f..1753de5 100644
--- a/src/app/tests/api/api_v1/test_tutor.py
+++ b/src/app/tests/api/api_v1/test_tutor.py
@@ -11,7 +11,7 @@
 
 @mock.patch("src.app.services.sql_db.session_maker")
 @mock.patch(
-    "src.app.services.security.check_api_key", new=mock.MagicMock(return_value=True)
+    "src.app.services.security.check_api_key", new=mock.MagicMock(return_value=(True, 'welearn'))
 )
 class TutorTests(IsolatedAsyncioTestCase):
     def test_tutor_no_files(self, *mocks):
diff --git a/src/main.py b/src/main.py
index 6d54831..e9db534 100644
--- a/src/main.py
+++ b/src/main.py
@@ -13,9 +13,18 @@
 from src.app.api.shared.enpoints import health
 from src.app.core.config import settings
 from src.app.services.security import get_user
-from src.app.utils.logger import logger
+from src.app.utils.logger import logger as logger_utils
 
-logger = logger(__name__)
+
+import psutil
+import os
+
+
+def monitor_memory():
+    """Monitor current memory usage."""
+    process = psutil.Process(os.getpid())
+    return process.memory_info().rss / 1024 / 1024  # Convert to MB
+logger = logger_utils(__name__)
 
 app = FastAPI(
     openapi_tags=api_tags_metadata,
@@ -87,6 +96,23 @@ async def add_process_time_header(request: Request, call_next):
             return Response(status_code=status.HTTP_204_NO_CONTENT)
         raise
 
+@app.middleware("http")
+async def log_client(request: Request, call_next):
+    print(f"Initial memory: {monitor_memory():.2f} MB")
+    try:
+        db_client = get_user(request.headers['x-api-key'])
+        logger.info(
+            "Client IP=%s, User-Agent=%s, DB-client=%s",
+            request.headers.get('origin'),
+            request.headers.get("user-agent"),
+            db_client,
+        )
+    except Exception:
+        print('Error in get_user:')
+    response = await call_next(request)
+    print(f"After creation: {monitor_memory():.2f} MB")
+    return response
+
 
 app.add_middleware(
     CORSMiddleware,