Server migration to another host

To execute DerScanner server migration from Host_1 to Host_2:

1. On Host_1, run:

   sudo docker exec app-db pg_dump -U backend backend > db_dump.sql

2. Deploy new instance of DerScanner to Host_2.

3. Transfer DB dump to Host_2.

4. Transfer /opt/derscanner/app/services/backend/files/ from Host_1 to Host_2 with the same assigned path.

5. On Host_2, run:

   sudo systemctl stop derscanner-app.service
   sudo docker volume rm -f app-postgres-data
   sudo docker compose -f /opt/derscanner/app/app.compose.yml up -d app-db`
   sudo docker cp db_dump.sql app-db:/

   (execute from the directory, where the DB dump is located)

   sudo docker exec app-db bash -c "psql -U backend backend < db_dump.sql"
   sudo systemctl start derscanner-app.service