rust: más parametros de optimización de sqlite

rust/src/main.rs

@@ -67,6 +67,8 @@ fn make_conn() -> Result<Connection, Box<dyn Error>> {
     let conn = Connection::open(db_path())?;
     conn.pragma_update(None, "journal_mode", "OFF")?;
     conn.pragma_update(None, "synchronous", 0)?;
+    conn.pragma_update(None, "cache_size", 1000000)?;
+    conn.pragma_update(None, "locking_mode", "EXCLUSIVE")?;
     Ok(conn)
 }