Refactor pg_backup.sh to track newest backup files and update deletion logic

- Changed variable names from oldest to newest for clarity.
- Updated logic to find the newest backup file instead of the oldest.
- Adjusted logging to reflect the change in backup file tracking.
- Modified file deletion criteria to use the newest backup timestamp.

Add batch_rsync.ps1 for parallel rsync operations in PowerShell

- Implemented a PowerShell script to launch multiple rsync processes concurrently.
- Added features for auto-tuning worker count based on file size and destination type.
- Included verbose output options and support for dry runs.
- Ensured compatibility with Windows paths and rsync arguments.

Enhance pyrsync.py with recursive file handling and auto-tuning

- Added support for balanced recursive file chunking in rsync operations.
- Implemented auto-tuning of worker count based on average file size.
- Improved output handling and error reporting for rsync tasks.
- Updated command-line argument parsing for enhanced usability.

Create sync_data.ps1 for FreeFileSync job management

- Developed a PowerShell script to manage synchronization jobs using FreeFileSync.
- Implemented logging for synchronization processes and error handling.
- Added functionality to copy HTML reports generated by FreeFileSync.
- Included an option to force shutdown regardless of synchronization success.

personal/cron_scripts/pg_backup.sh

@@ -21,9 +21,9 @@ WAL_ARCHIVE_DIR="/var/lib/postgresql_archive/18/main/pg_wal"
 WAL_MIN_AGE_DAYS=7
 
 clean_walfiles() {
-	local oldest_backup=""
-	local oldest_backup_ts=""
-	local oldest_backup_dt=""
+	local newest_backup=""
+	local newest_backup_ts=""
+	local newest_backup_dt=""
 	local age_cutoff_ts=""
 	local age_cutoff_dt=""
 	local backup_ts=""
@@ -53,26 +53,26 @@ clean_walfiles() {
 
 	for backup_file in "${backup_files[@]}"; do
 		backup_ts=$(stat -c %Y "$backup_file")
-		if [[ -z "$oldest_backup_ts" || "$backup_ts" -lt "$oldest_backup_ts" ]]; then
-			oldest_backup_ts="$backup_ts"
-			oldest_backup="$backup_file"
+		if [[ -z "$newest_backup_ts" || "$backup_ts" -gt "$newest_backup_ts" ]]; then
+			newest_backup_ts="$backup_ts"
+			newest_backup="$backup_file"
 		fi
 	done
 
 	age_cutoff_ts=$(date -d "$WAL_MIN_AGE_DAYS days ago" +%s)
-	oldest_backup_dt=$(date -d "@$oldest_backup_ts" '+%Y-%m-%d %H:%M:%S')
+	newest_backup_dt=$(date -d "@$newest_backup_ts" '+%Y-%m-%d %H:%M:%S')
 	age_cutoff_dt=$(date -d "@$age_cutoff_ts" '+%Y-%m-%d %H:%M:%S')
 
 	log "WAL archive dir      : $WAL_ARCHIVE_DIR"
-	log "Oldest .backup file  : $oldest_backup"
-	log "Oldest .backup mtime : $oldest_backup_dt"
+	log "Newest .backup file  : $newest_backup"
+	log "Newest .backup mtime : $newest_backup_dt"
 	log "WAL age cutoff       : $age_cutoff_dt"
 
 	while IFS= read -r -d '' file; do
 		file_ts=$(stat -c %Y "$file")
 
 		# Delete only when both constraints are true.
-		if [[ "$file_ts" -lt "$oldest_backup_ts" && "$file_ts" -lt "$age_cutoff_ts" ]]; then
+		if [[ "$file_ts" -lt "$newest_backup_ts" && "$file_ts" -lt "$age_cutoff_ts" ]]; then
 			files_to_delete+=("$file")
 		fi
 	done < <(find "$WAL_ARCHIVE_DIR" -maxdepth 1 -type f ! -name '*.backup' -print0)