feat(monitor): Add HANA data backup age monitoring

Introduces a new monitoring check in 'monitor.sh' to verify the age of the last successful SAP HANA data backup. Alerts are sent if the backup age exceeds a configurable 'BACKUP_THRESHOLD_HOURS'. Updates script version to 1.1.0.

monitor/monitor.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Version: 1.0.5
+# Version: 1.1.0
 # =============================================================================
 # SAP HANA Monitoring Script
 #
@@ -123,5 +123,35 @@ if (( $(echo "$free_percentage < $FREE_PERCENTAGE_THRESHOLD" | bc -l) )); then
     send_notification "HANA Log Segment Alert" "🚨 Alert: Only ${free_percentage}% of HANA log segments are in 'Free' state."
 fi
 
+echo "ℹ️ Checking last successful data backup status..."
+
+# Query to get the start time of the most recent successful complete data backup
+last_backup_date=$(hdbsql -U "$HANA_USERKEY" -j -a -x \
+    "SELECT TOP 1 SYS_START_TIME FROM M_BACKUP_CATALOG WHERE ENTRY_TYPE_NAME = 'complete data backup' AND STATE_NAME = 'successful' ORDER BY SYS_START_TIME DESC" 2>/dev/null | tr -d "\"" | sed 's/\..*//') # sed removes fractional seconds
+
+if [[ -z "$last_backup_date" ]]; then
+    # No successful backup found at all
+    local message="🚨 Critical: No successful complete data backup found for ${COMPANY_NAME} HANA."
+    echo "$message"
+    send_notification "HANA Backup Alert" "$message"
+    return
+fi
+
+# Convert dates to epoch seconds for comparison
+last_backup_epoch=$(date -d "$last_backup_date" +%s)
+current_epoch=$(date +%s)
+threshold_seconds=$((BACKUP_THRESHOLD_HOURS * 3600))
+
+age_seconds=$((current_epoch - last_backup_epoch))
+age_hours=$((age_seconds / 3600))
+
+if (( age_seconds > threshold_seconds )); then
+    local message="🚨 Critical: Last successful HANA backup for ${COMPANY_NAME} is ${age_hours} hours old, which exceeds the threshold of ${BACKUP_THRESHOLD_HOURS} hours. Last backup was on: ${last_backup_date}."
+    echo "$message"
+    send_notification "HANA Backup Alert" "$message"
+else
+    echo "✅ Success! Last successful backup is ${age_hours} hours old (Threshold: ${BACKUP_THRESHOLD_HOURS} hours)."
+fi
+
 echo "✅ Success! HANA monitoring check complete."