Add 'database backup'

database-backup.md

@@ -0,0 +1,23 @@
+## Pan.do/ra backup database
+
+as pandora user:
+
+```
+mkdir -p /srv/pandora/database
+pg_dump pandora | gzip > /srv/pandora/database/pandora-`date -I`.psql.gz
+```
+
+
+Restore database from backup:
+    
+If needed create postgres db:
+```
+sudo -u postgres createdb  -T template0 --locale=C --encoding=UTF8 -O pandora pandora
+echo "CREATE EXTENSION pg_trgm;" | sudo -u postgres psql pandora
+```
+
+load db from backup as pandora user
+
+```
+zcat  /srv/pandora/database/pandora-2023-06-07.psql.gz | pandoractl manage dbshell
+```