Fix username generation with long int suffixes

server/mergin/auth/models.py

@@ -212,12 +212,12 @@ def generate_username(cls, email: str) -> Optional[str]:
             text(
                 """
                 SELECT
-                    replace(lower(username), :username, '0')::int AS suffix
+                    replace(lower(username), :username, '0')::bigint AS suffix
                 FROM "user"
                 WHERE
                     lower(username) = :username OR
                     lower(username) SIMILAR TO :username_like
-                ORDER BY replace(lower(username), :username, '0')::int DESC
+                ORDER BY replace(lower(username), :username, '0')::bigint DESC
                 LIMIT 1;
                 """
             ),

server/mergin/tests/test_auth.py

@@ -866,6 +866,10 @@ def test_username_generation(client):
     user = add_user("testuser1")
     assert User.generate_username("Testuser@example.com") == "testuser2"
 
+    # test username with crazy long int suffix
+    user = add_user("testuser13120931904")
+    assert User.generate_username("Testuser@example.com") == "testuser13120931905"
+
 
 def test_server_usage(client):
     """Test server usage endpoint"""