Will use only one DB

app/Controllers/auth/authSigmaUser.ts

 import Env from '@ioc:Adonis/Core/Env'
 import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'
+import NotSigmaUser from 'App/Models/NotSigmaUser'
 import { ClientMetadata, Issuer, generators } from 'openid-client'
 
 const AUTH_URL = 'https://auth.binets.fr'
@@ -60,11 +61,12 @@ export const callbackSigmaUser = async ({ response, request, auth }: HttpContext
   if (!username || !name || !groups)
     throw new Error('The user given by the auth server is incomplete')
 
-  const user = {
+  const user = await NotSigmaUser.firstOrCreate({
     username, // Unique ?
     name,
     groups: groups as string[], // ! UGLY
-  }
+  })
 
+  const token = await auth.use('api').login(user)
   return response.ok('Ok!')
 }