Mirror test layout, domcontentloaded waits, backup DB writes outside threads

tests/unit/database/sql_lint.py

@@ -0,0 +1,7 @@
+# retoor <retoor@molodetz.nl>
+from molodetz.database.sql_lint import collect_sql, lint
+
+
+def test_raw_sql_parses_with_sqlglot():
+    assert collect_sql(), "expected raw SQL literals to lint"
+    assert lint() == []