fix: stabilize runtime follow-up regressions

src/lib/sqlite-connector.h

@@ -17,6 +17,10 @@ struct SQLite {
 	DTree query(String q);
 	DTree query(String q, const StringMap& params);
 
+	// Unregisters from the request's connection tracking, so stack-allocated
+	// instances cannot leave dangling pointers behind for request cleanup.
+	~SQLite() { disconnect(); }
+
 private:
 	void set_error(s32 code, String info = "");
 	bool apply_default_pragmas();