diff --git a/README.md b/README.md
index 9064a89..6be7a16 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,9 @@ Environment="SMTP_TO=admin@example.com"
 # Environment="WEB_USER=admin"
 # Environment="WEB_PASS=supersecret"
 
+# Optional: Number of days to retain scan history in the database (Default: 30)
+# Environment="RETENTION_DAYS=30"
+
 Restart=always
 RestartSec=5
 
diff --git a/internal/scheduler/scheduler.go b/internal/scheduler/scheduler.go
index 977fbbe..80564cf 100644
--- a/internal/scheduler/scheduler.go
+++ b/internal/scheduler/scheduler.go
@@ -1,7 +1,10 @@
 package scheduler
 
 import (
+	"fmt"
 	"log"
+	"os"
+	"strconv"
 
 	"github.com/robfig/cron/v3"
 
@@ -15,6 +18,34 @@ var c *cron.Cron
 func InitScheduler() {
 	c = cron.New()
 	
+	// Automated Data Cleanup Job (Runs every day at midnight)
+	c.AddFunc("@daily", func() {
+		days := os.Getenv("RETENTION_DAYS")
+		if days == "" {
+			days = "30"
+		}
+		
+		retentionDays, err := strconv.Atoi(days)
+		if err != nil {
+			log.Printf("Invalid RETENTION_DAYS environment variable: %s", days)
+			retentionDays = 30
+		}
+		
+		log.Printf("Running automated cleanup (Retention: %d days)", retentionDays)
+		
+		modifier := fmt.Sprintf("-%d days", retentionDays)
+		res, err := db.DB.Exec("DELETE FROM scans WHERE started_at < date('now', ?)", modifier)
+		if err != nil {
+			log.Printf("Cleanup failed: %v", err)
+			return
+		}
+		
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected > 0 {
+			log.Printf("Cleanup complete: removed %d old scans.", rowsAffected)
+		}
+	})
+
 	// Load all targets
 	rows, err := db.DB.Query("SELECT id, name, address, schedule FROM targets")
 	if err != nil {