I do not understand the algorithm for connecting a database to a web application. What steps should be?

Question

PostgreSQL

I have a website built in vue.js + C#. PostgreSQL is used as a database, the site developers left a backup file in .sql format. How to run the site locally so that the database is loaded with a backup? The site has an admin panel for managing managers. Maybe somehow through it it will be possible to load the backup correctly?
Downloaded pgAdmin for these cases.
I don’t quite understand how a separately created database can contact the application, do I need to write something for this in the application files?
PS Locally created the database, the superuser too.
PSS Operating system Ubuntu 18 LTS

Answer 1

Install subd.
Create a base.
Create a user (it's not always safe to be rooted, even on LAN).
Upload the dump, which is in sql format, into the database.
Connect your app.
www.codeproject.com/KB/database/afppostgresqlintro.aspx