new db file rename

.gitignore

@@ -6,3 +6,4 @@ json.zip
 /exp
 /.vscode
 test*.bin
+db.dat

app/src/main.rs

@@ -18,7 +18,7 @@ use crate::questions::{Question, QuestionsConverter};
 use crate::source::ReadSourceQuestionsBatches;
 
 const ZIP_FILENAME: &str = "json.zip";
-const NEW_DB_FILENAME: &str = "test.bin";
+const NEW_DB_FILENAME: &str = "db.dat";
 const DB_DIR: &str = "db";
 
 #[derive(Subcommand, Debug)]