feat: add group_by to fetch_page (#2140)

---------

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>
Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

tests/core/test_helpers_query.py

@@ -1,27 +1,21 @@
 import pytest
-from pydantic import BaseModel
 
 from lnbits.helpers import (
     insert_query,
     update_query,
 )
+from tests.helpers import DbTestModel
 
-
-class DbTestModel(BaseModel):
-    id: int
-    name: str
-
-
-test = DbTestModel(id=1, name="test")
+test = DbTestModel(id=1, name="test", value="yes")
 
 
 @pytest.mark.asyncio
 async def test_helpers_insert_query():
     q = insert_query("test_helpers_query", test)
-    assert q == "INSERT INTO test_helpers_query (id, name) VALUES (?, ?)"
+    assert q == "INSERT INTO test_helpers_query (id, name, value) VALUES (?, ?, ?)"
 
 
 @pytest.mark.asyncio
 async def test_helpers_update_query():
     q = update_query("test_helpers_query", test)
-    assert q == "UPDATE test_helpers_query SET id = ?, name = ? WHERE id = ?"
+    assert q == "UPDATE test_helpers_query SET id = ?, name = ?, value = ? WHERE id = ?"