How to store all the bug bounty assets like domains, ip addresses, etc. in file and automatically check for the any 0day vuln that comes into the market?
Here is a simple approach that might work for you. Perform reconnaissance as you would typically do and collect hosts and targets. Next, find an application running the target software or setup a local instance. Gather strings that would easily allow you to discern the piece of software from other applications (e.g. with GitLab this may be _gitlab_session). With that small list of keywords in hand, fingerprint all hosts by requesting the index page using a tool such as meg by @TomNomNom and then grepping for the strings. Make sure to then store your findings in a structured fashion that allows you to query applications running that software in future. I primarily use text files in folders for this purpose but I know of others who prefer to store everything in a database.