Update app.py

app.py

@@ -41,8 +41,10 @@ def signup():
             c.execute("INSERT INTO users (username, password) VALUES (?, ?)", (username, password))
             conn.commit()
             conn.close()
+            flash("Signup successful! Please log in.", "success")
             return redirect(url_for("login"))
         except:
+            flash("Username already exists. Try another one.", "error")
             return "Username already exists!"
     return render_template("signup.html")
 
@@ -58,14 +60,17 @@ def login():
         conn.close()
         if user and check_password_hash(user[2], password):
             session["username"] = username
+            flash("Login successful!", "success")
             return redirect(url_for("home"))
         else:
+            flash("Invalid credentials. Try again.", "error")
             return "Invalid credentials"
     return render_template("login.html")
 
 @app.route("/logout")
 def logout():
     session.pop("username", None)
+    flash("You have been logged out.", "info")
     return redirect(url_for("login"))
 
 @app.route("/home")