If a user subscribes to Khoj with an email address that's not present in the DB, create an account

src/khoj/database/adapters/__init__.py

@@ -41,6 +41,7 @@ from khoj.search_filter.word_filter import WordFilter
 from khoj.utils import state
 from khoj.utils.config import GPT4AllProcessorModel
 from khoj.utils.helpers import generate_random_name
+from khoj.database.adapters import get_or_create_user_by_email
 
 
 class SubscriptionState(Enum):
@@ -85,6 +86,15 @@ async def get_or_create_user(token: dict) -> KhojUser:
     return user
 
 
+async def get_or_create_user_by_email(email: str) -> KhojUser:
+    user, _ = await KhojUser.objects.filter(email=email).aupdate_or_create(defaults={"username": email, "email": email})
+    await user.asave()
+
+    await Subscription.objects.acreate(user=user, type="trial")
+
+    return user
+
+
 async def create_user_by_google_token(token: dict) -> KhojUser:
     user, _ = await KhojUser.objects.filter(email=token.get("email")).aupdate_or_create(
         defaults={"username": token.get("email"), "email": token.get("email")}
@@ -115,7 +125,10 @@ def get_user_subscription(email: str) -> Optional[Subscription]:
 async def set_user_subscription(
     email: str, is_recurring=None, renewal_date=None, type="standard"
 ) -> Optional[Subscription]:
-    user_subscription = await Subscription.objects.filter(user__email=email).afirst()
+    # Get or create the user object
+    user = await get_or_create_user_by_email(email)
+
+    user_subscription = await Subscription.objects.filter(user=user).afirst()
     if not user_subscription:
         user = await get_user_by_email(email)
         if not user: