diff --git a/apps/notification/backend/models/models.py b/apps/notification/backend/models/models.py
index 542aa64..f1a02d1 100644
--- a/apps/notification/backend/models/models.py
+++ b/apps/notification/backend/models/models.py
@@ -55,7 +55,7 @@ class EmailSendStatusDoc(Document):
         indexes = [
             "email_id",
             "tenant_id"
-            ]
+        ]
 
 class EmailTrackingDoc(Document):
     email_id: str
@@ -83,7 +83,7 @@ class EmailTrackingDoc(Document):
         indexes = [
             "email_id",
             "tenant_id"
-            ]
+        ]
 
 class EmailBounceDoc(Document):
     email: str
@@ -104,5 +104,25 @@ class EmailBounceDoc(Document):
         indexes = [
             "email",
             "tenant_id"
-            ]
-    
\ No newline at end of file
+        ]
+    
+class UsageLogDoc(Document):
+    timestamp: datetime = datetime.utcnow()     # timestamp
+    tenant_id: str                              # tenant id
+    operation: str                              # operation type
+    request_id: str                             # request id # TODO: use true one
+    units: int                                  # units
+    status: str                                 # operation status
+    latency_ms: int                             # latency time(milliseconds)
+    bytes_in: int                               # input bytes
+    bytes_out: int                              # output bytes
+    key_id: Optional[str] = None                # API Key ID
+    extra: dict = {}                            # extra information
+    
+    class Settings:
+        name = "usage_log_doc"
+        indexes = [
+            "tenant_id",
+            "request_id",
+            "key_id"
+        ]
\ No newline at end of file
diff --git a/apps/notification/webapi/providers/database.py b/apps/notification/webapi/providers/database.py
index 00e0d66..8a6e350 100644
--- a/apps/notification/webapi/providers/database.py
+++ b/apps/notification/webapi/providers/database.py
@@ -1,15 +1,12 @@
 from webapi.config.site_settings import site_settings
 from beanie import init_beanie
 from motor.motor_asyncio import AsyncIOMotorClient
-from backend.models.models import MessageTemplateDoc, EmailSenderDoc, EmailSendStatusDoc, EmailTrackingDoc, EmailBounceDoc
+from backend.models.models import MessageTemplateDoc, EmailSenderDoc, EmailSendStatusDoc, EmailTrackingDoc, EmailBounceDoc, UsageLogDoc
 import os
 
 # MongoDB config
-# TODO: for non-local environment, use the following config
-#MONGODB_URI = os.getenv('MONGODB_URI', 'mongodb+srv://jetli:8IHKx6dZK8BfugGp@freeleaps2.hanbj.mongodb.net/')
-#MONGODB_NAME = os.getenv('MONGODB_NAME', 'freeleaps2')
-MONGODB_URI = os.getenv('MONGODB_URI', 'mongodb://localhost:27017/')
-MONGODB_NAME = os.getenv('MONGODB_NAME', 'interview')
+MONGODB_URI = os.getenv('MONGODB_URI')
+MONGODB_NAME = os.getenv('MONGODB_NAME')
 
 # create MongoDB client
 client = AsyncIOMotorClient(
@@ -26,7 +23,8 @@ document_models = [
     EmailSenderDoc,
     EmailSendStatusDoc,
     EmailTrackingDoc,
-    EmailBounceDoc
+    EmailBounceDoc,
+    UsageLogDoc
 ]
 
 def register(app):
@@ -40,13 +38,7 @@ def register(app):
 
 async def initiate_database():
     """initiate Beanie database connection"""
-    try:
-        await init_beanie(
-            database=client[MONGODB_NAME],
-            document_models=document_models
-        )
-        print(f"✅ database initialized successfully: {MONGODB_NAME}")
-        print(f"   URI: {MONGODB_URI}")
-    except Exception as e:
-        print(f"❌ database initialization failed: {e}")
-        raise
+    await init_beanie(
+        database=client[MONGODB_NAME],
+        document_models=document_models
+    )
\ No newline at end of file