feat(backups): create weekly partial backup for RISM

Adds functionality to `db_backup.sh` and `postgres_backup.sh`
to create a weekly backup of some tables in the database for RISM's
use. user, auth, and reversion tables are not included.

The backup is added to the backup directory (defined in ansible
deployment) in the `rism` subdirectory.

cron/postgres/db_backup.sh

@@ -19,7 +19,7 @@ BACKUP_FILENAME=$(date "+%Y-%m-%dT%H:%M:%S").sql.gz                 # This is th
 
 
 # Create the backup and copy it to the daily backup directory
-mkdir -p $BACKUP_DIR/daily $BACKUP_DIR/weekly $BACKUP_DIR/monthly $BACKUP_DIR/yearly
+mkdir -p $BACKUP_DIR/daily $BACKUP_DIR/weekly $BACKUP_DIR/monthly $BACKUP_DIR/yearly $BACKUP_DIR/rism
 /usr/bin/docker exec cantusdb-postgres-1 /usr/local/bin/postgres_backup.sh $BACKUP_FILENAME
 /usr/bin/docker cp cantusdb-postgres-1:/var/lib/postgresql/backups/$BACKUP_FILENAME $BACKUP_DIR/daily
 /usr/bin/docker exec cantusdb-postgres-1 rm /var/lib/postgresql/backups/$BACKUP_FILENAME
@@ -34,10 +34,14 @@ MONTH_OF_YEAR=$(date "+%m")
 
 # Retain weekly backups on Mondays
 # Manage retention of weekly backups
+# Copy the partial export for RISM purposes (created weekly on Mondays)
 if [ $DAY_OF_WEEK -eq 1 ]; then
     cp $BACKUP_DIR/daily/$BACKUP_FILENAME $BACKUP_DIR/weekly
     FILES_TO_REMOVE=$(ls -td $BACKUP_DIR/weekly/* | tail -n +9)
     [[ ! -z "$FILES_TO_REMOVE" ]] && rm $FILES_TO_REMOVE
+    # Copy the partial DB backup for RISM purposes to $BACKUP_DIR/rism
+    /usr/bin/docker cp cantusdb-postgres-1:/var/lib/postgresql/backups/cantusdb_rism_export.sql.gz $BACKUP_DIR/rism
+    /usr/bin/docker exec cantusdb-postgres-1 rm /var/lib/postgresql/backups/cantusdb_rism_export.sql.gz
 fi
 
 # Retain a monthly backup on the first day of the month

postgres/postgres_backup.sh

@@ -3,4 +3,12 @@
 # Script backs up the Cantus Database in a compressed SQL file
 
 mkdir -p /var/lib/postgresql/backups
-pg_dump cantusdb -U cantusdb | gzip > /var/lib/postgresql/backups/$1
+# Create a full DB backup for recovery purposes
+pg_dump cantusdb -U cantusdb | gzip > /var/lib/postgresql/backups/$1
+
+
+# Create a partial DB backup for RISM purposes on Mondays
+DAY_OF_WEEK=$(date "+%u")
+if [ $DAY_OF_WEEK -eq 1 ]; then
+    pg_dump -U cantusdb -d cantusdb -T 'auth*' -T 'users*' -T 'reversion*' | gzip > /var/lib/postgresql/backups/cantusdb_rism_export.sql.gz
+fi