initialize database if table doesn't exist

main.go

@@ -57,6 +57,13 @@ func init() {
 		log.Fatalf("failed to connect to database: %v", err)
 	}
 
+	// Check if database needs to be initialized (create tables)
+	// does nothing if tables exist
+	err = dbConn.InitializeDatabase()
+	if err != nil {
+		log.Fatalf("failed to initialize database: %v", err)
+	}
+
 	uniqueVisits, err = dbConn.GetUniqueVisits()
 	if err != nil {
 		log.Fatalf("failed to get number of unique visits from database: %v", err)