diff --git a/crud.py b/crud.py
index b08f0ea..a70c81e 100644
--- a/crud.py
+++ b/crud.py
@@ -80,6 +80,7 @@ async def create_appointment(
         end_time=data.end_time,
         schedule=schedule_id,
         paid=False,
+        created_at=datetime.now(),
     )
     await db.execute(
         insert_query("lncalendar.appointment", appointment),
@@ -150,6 +151,7 @@ async def create_unavailable_time(data: CreateUnavailableTime) -> UnavailableTim
         start_time=data.start_time,
         end_time=data.end_time or data.start_time,
         schedule=data.schedule,
+        created_at=datetime.now(),
     )
     await db.execute(
         insert_query("lncalendar.unavailable", unavailable_time),
diff --git a/migrations.py b/migrations.py
index ff16927..27e3f9a 100644
--- a/migrations.py
+++ b/migrations.py
@@ -51,3 +51,21 @@ async def m001_initial(db):
         );
     """
     )
+
+
+async def m002_rename_time_to_created_at(db):
+    """
+    Rename time to created_at in the unavailability table.
+    """
+    await db.execute(
+        """
+        ALTER TABLE lncalendar.unavailable
+        RENAME COLUMN time TO created_at;
+        """
+    )
+    await db.execute(
+        """
+        ALTER TABLE lncalendar.appointment
+        RENAME COLUMN time TO created_at;
+        """
+    )
diff --git a/models.py b/models.py
index a6b7ed9..3ac1d84 100644
--- a/models.py
+++ b/models.py
@@ -1,3 +1,4 @@
+from datetime import datetime
 from typing import Optional
 
 from fastapi import Query
@@ -49,6 +50,7 @@ class UnavailableTime(BaseModel):
     start_time: str
     end_time: str
     schedule: str
+    created_at: datetime
 
 
 class Appointment(BaseModel):
@@ -60,4 +62,4 @@ class Appointment(BaseModel):
     end_time: str
     schedule: str
     paid: bool
-    time: int
+    created_at: datetime
diff --git a/views_api.py b/views_api.py
index 1f50e1e..f5b7d75 100644
--- a/views_api.py
+++ b/views_api.py
@@ -1,9 +1,7 @@
-import sched
 from http import HTTPStatus
 
 from fastapi import APIRouter, Depends, Query
 from fastapi.exceptions import HTTPException
-
 from lnbits.core.crud import get_standalone_payment, get_user
 from lnbits.core.models import User, WalletTypeInfo
 from lnbits.core.services import create_invoice