Fix.

src/snek/service/user.py

@@ -4,6 +4,15 @@ from snek.system.service import BaseService
 
 class UserService(BaseService):
     mapper_name = "user"
+    
+    async def search(self, query, **kwargs):
+        query = query.strip().lower()
+        if not query:
+            raise []
+        results = []
+        async for result in self.find(username=dict(ilike='%' + query + '%'), **kwargs):
+            results.append(result)
+        return results
 
     async def validate_login(self, username, password):
         model = await self.get(username=username)