Moodle

https://docs.moodle.org/311/en/PostgreSQL

https://andreyex.ru/ubuntu/ustanovka-postgresql-s-phppgadmin-na-ubuntu-16-04/

https://selectel.ru/blog/postgresql-backup-tools/

https://linuxconfig.org/ubuntu-20-04-postgresql-installation

https://stackoverflow.com/questions/19134471/rsync-over-ssh-delete-existing-files

https://bozza.ru/art-190.html

https://losst.ru/ustanovka-lamp-v-ubuntu-20-04

https://timeweb.com/ru/community/articles/kak-ustanovit-stek-lamp-na-ubuntu-20-04

https://stackoverflow.com/questions/13497352/error-permission-denied-for-relation-tablename-on-postgres-while-trying-a-selec

https://github.com/PostgREST/postgrest/issues/251

# DB Version: 12
# OS Type: linux
# DB Type: web
# Total Memory (RAM): 16 GB
# CPUs num: 16
# Connections num: 3000
# Data Storage: ssd

max_connections = 3000
shared_buffers = 4GB
effective_cache_size = 12GB
maintenance_work_mem = 1GB
checkpoint_completion_target = 0.9
wal_buffers = 16MB
default_statistics_target = 100
random_page_cost = 1.1
effective_io_concurrency = 200
work_mem = 349kB
min_wal_size = 1GB
max_wal_size = 4GB
max_worker_processes = 16
max_parallel_workers_per_gather = 4
max_parallel_workers = 16
max_parallel_maintenance_workers = 4

https://stackoverflow.com/questions/3327312/how-can-i-drop-all-the-tables-in-a-postgresql-database?rq=1