The pricing isn't as simple as that, I can't say how much it'll cost purely based on your daily active users. Railway prices are based on your resource usage, not the amount of users. Example: if you're hosting a simple API that gives you the current time in New York, you can have 10,000 DAU and it probably won't cost all that much, but if you're running something like a video-sharing site, then the average user will use a lot more resources and it'll thus cost more money.

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Regarding the database, Railway charges 0.25 dollars per GB per month of persistent storage, so if your database is 1GB then you'll be charged 0.25 dollars for that database. This doesn't include the RAM and CPU your database uses though. You should also keep egress cost in mind as well, although for databases on Railway - you can bypass egress usage by using private networking.

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For more information about the pricing, you can visit Railway's Pricing Page

Thanks a lot.

edited: yes, newline characters are gone