Oracle DR: Fix backup retention to keep exactly 2 days instead of 3

Changed -mtime logic from +$RetentionDays to +($RetentionDays - 1) to correctly implement 2-day retention. Previously kept 3 days (today + 2 previous), now keeps exactly 2 days (today + yesterday).

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Co-Authored-By: Claude <noreply@anthropic.com>

oracle/standby-server-scripts/transfer_incremental.ps1

@@ -59,7 +59,9 @@ function Cleanup-OldBackupsOnDR {
         Write-Log "Backups before cleanup: $countBefore"
 
         # Cleanup: șterge fișiere mai vechi de $RetentionDays zile
-        $cleanupCmd = "find '$DRPath' -name '*.BKP' -type f -mtime +$RetentionDays -delete 2>&1"
+        # -mtime +N înseamnă "mai vechi de N zile", deci pentru a păstra RetentionDays zile, folosim +($RetentionDays - 1)
+        $mtimeDays = $RetentionDays - 1
+        $cleanupCmd = "find '$DRPath' -name '*.BKP' -type f -mtime +$mtimeDays -delete 2>&1"
         $result = & ssh -n -p $DRPort -i $SSHKeyPath "${DRUser}@${DRHost}" $cleanupCmd 2>&1
 
         if ($LASTEXITCODE -ne 0) {