Fix store_reference errors in malware scanner

- Added missing source for reference-db.sh library in malware-scanner.sh:15
- Created store_reference() and get_reference() functions in reference-db.sh
- Functions use REF|key|value format in .sysref database
- Fixes "store_reference: command not found" errors at lines 816-817

lib/reference-db.sh

@@ -557,6 +557,37 @@ export -f db_get_all_users
 export -f db_get_user_databases
 export -f db_get_user_domains
 export -f db_get_database_owner
+#############################################################################
+# SIMPLE KEY-VALUE STORE (for cross-module session data)
+#############################################################################
+
+# Store a key-value pair in the reference database
+store_reference() {
+    local key="$1"
+    local value="$2"
+
+    if [ -z "$key" ] || [ -z "$value" ]; then
+        return 1
+    fi
+
+    # Use REF prefix for simple key-value pairs
+    echo "REF|$key|$value" >> "$SYSREF_DB"
+}
+
+# Retrieve the most recent value for a key
+get_reference() {
+    local key="$1"
+
+    if [ -z "$key" ] || [ ! -f "$SYSREF_DB" ]; then
+        return 1
+    fi
+
+    # Get the most recent value (last occurrence)
+    grep "^REF|$key|" "$SYSREF_DB" 2>/dev/null | tail -1 | cut -d'|' -f3
+}
+
+export -f store_reference
+export -f get_reference
 export -f db_get_all_wordpress
 export -f db_get_system_info
 export -f db_get_health_metric