Remove duplicate update database body (#1584)

tests/test_update_database_script.py

@@ -0,0 +1,8 @@
+from pathlib import Path
+
+
+def test_update_database_has_single_main_guard():
+    script = Path(__file__).resolve().parent.parent / "scripts" / "update_database.py"
+    text = script.read_text()
+
+    assert text.count('if __name__ == "__main__":') == 1