update title and input tag dynamically in html from database

i'm trying to update a value in my database in another html page called update.html when i go to update page for the first time it has the value first i assign (which make sense) after updating successfully it go back to home.html and shows the updated value in home.html but if i go to update that value again the title of the update.html and also the placeholder of the input tag in it is still the first value i assign (and also if i do it 10 times still is) how can i update the title and placeholder after updating value? this is my update.html:

{% extends "base.html" %} {% block title %}{{bars.data}}{% endblock %}{% block  content  %}
   
    <div class="form">
        <form action="/update/{{bars.id}}" method = "POST" >
             <input type="text" name = "ferestandee" id = "ferestandee"  placeholder="{{bars.data}}" ><br/><br/>
            <div align = "center">
                <input type="submit" class="btn btn-primary" value="update">  
              </div>
        </form>
        </div>
{% endblock %} 

this is my home.html :

{% extends "base.html" %} {% block title %}Home{% endblock %}{% block  content  %}

<h1 align = "center">NOTES<h1>
    
<ul class = "list-group list-group-flush" id = "notes">

{% for bars in user.barnames  %}
  <li class = "list-group-item">
       <h1 name="barnameId" id="barnameId" >  {{ bars.data }} </h1>
       
         <div align="right">
             <a href="/delete/{{bars.id}}">
             <button type = "button" class="btn btn-primary">Delete</button></a>
        
              <a href="/update/{{bars.id}}" method="POST">
              <input type="button" class = "btn btn-primary" value="update" > </a>   
             
         </div>    
       
    </li>
{% endfor %}    
{% endblock %}

this is my models :

class Barname(db.Model):
    __tablename__ = "barnamees"
    id = db.Column(db.Integer, primary_key=True)
    data = db.Column(db.String(10000))
    date = db.Column(db.String(10000))
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))

and this is my update func:

@views.route("/update/<int:id>" , methods = [ "GET" , "POST"])
@login_required
def update(id):
    bars = Barname.query.get_or_404(id)
    if request.method == "POST" :
        
        bars.data= request.form["ferestandee"]
        try:
           
            db.session.commit()
            flash ("updated successfully" , category = "success")
            return render_template("home.html" , user = current_user ,bars = bars)
        except :
            flash ("something went wrong" , category = "error")
            return render_template("home.html" , user = current_user)
    else :
        flash("method was get" , category = "error")

        return render_template("update.html" , user = current_user , bars=bars )

i'm new to coding so if my question is dumb really sorry