diff --git a/config.py b/config.py
index 896dfbb..b8dace4 100644
--- a/config.py
+++ b/config.py
@@ -2,4 +2,4 @@ import os
 import json
 file=os.environ.get('AUTH_CONFIG_FILE')
 if not file: raise Exception('AUTH_CONFIG_FILE not set. (It should point to a json file.) Exiting.')
-config=json.load(open(file))
\ No newline at end of file
+config=json.load(open(file))
diff --git a/main.py b/main.py
deleted file mode 100644
index 917284c..0000000
--- a/main.py
+++ /dev/null
@@ -1,11 +0,0 @@
-from importlib import import_module
-from . import utils, models
-from .config import config
-
-globals()['backend']=import_module('.backends.'+config['backend']['type'],'auth')
-backend.config=config['backend']['options']
-backend.utils=utils
-backend.models=models
-models.utils=utils
-models.backend=backend
-backend.init()
\ No newline at end of file
diff --git a/models.py b/models.py
index d836701..d123dba 100644
--- a/models.py
+++ b/models.py
@@ -1,6 +1,6 @@
 from dataclasses import dataclass
-from pydantic.v1 import validate_arguments
 from datetime import datetime
+from enum import Enum
 import uuid
 
 class AbstractUser():
@@ -29,9 +29,11 @@ class Token():
 class InviteToken(Token):
 	_uses: int=0
 	_max_uses: int=-1
-	expires: datetime=None
-	@validate_arguments
+	expires: datetime|None=None
 	def __init__(self,value,owner,uses:int,maxuses:int,expiry:datetime|None):
+		uses=int(uses); maxuses=int(maxuses);
+		if expiry!='None': expiry=datetime(expiry)
+		else: expiry=None
 		self.uses,self.max_uses,self.expires=uses,maxuses,expiry
 		return super().__init__(value,owner)
 	@property
@@ -62,6 +64,7 @@ class User(AbstractUser):
 	salt: str
 	_invited_by: AbstractUser|str # Root node will just reference itself
 	email: str=''
+	state: str='pending'
 	def _load_invite(self):
 		if self._invited_by==self.username: return self # Sanity-check to prevent infinite recursion.
 		return backend.load_user(self._invited_by)
@@ -72,8 +75,11 @@ class User(AbstractUser):
 		return self._invited_by
 	@property
 	def serialise(self):
-		return ','.join([self.username,self.password_hash,str(self.salt),self.invited_by.username,self.email or ''])
+		upstream=self.invited_by
+		upstream=upstream.username if upstream else 'None'
+		return ','.join([self.username,self.password_hash,str(self.salt),upstream,self.email or '',self.state])
 	def create_inv_token(self,*args,**kwargs):
+		"""	All arguments are passed directly to InviteToken's constructor, with self added at the beginning	"""
 		tok=InviteToken(self,*args,**kwargs)
 		backend.save_invite(tok)
 		return tok
@@ -97,12 +103,18 @@ class User(AbstractUser):
 			return a
 		raise Exception("Incorrect password")
 	@classmethod
-	def register(cls,username:str,password:str,invite:InviteToken,email:str=''):
+	def register(cls,username:str,password:str,invite:InviteToken=None,email:str=''):
 		if set([chr(n) for n in range(32)]+[','])&set(username): raise Exception('Invalid username')
 		u=backend.load_user(username)
 		if u is not None: raise Exception("User already exists")
-		u=User(username,*utils.phash(password),invite.owner,email)
+		if invite:
+			owner=invite.owner
+		else:
+			owner=None
+		u=User(username,*utils.phash(password),owner,email)
+		if invite:
+			user.state='approved' # Invited users don't need approval
+			invite.uses+=1
+			backend.save_invite(invite)
 		u.save()
-		invite.uses+=1
-		backend.save_invite(invite)
-		return u
\ No newline at end of file
+		return u