How to resolve post 200 successful but new record not added to the tables, flash not displaying and not being redirected to the appropriate page



import re
from flask import Flask, render_template, request, flash, redirect, url_for
from flask import Blueprint
from db import db
from os import path
from models import Student, Studentreview, Admin, Cao, Lecturer, Lecturer_review, Cao_review
from werkzeug.security import generate_password_hash, check_password_hash
import segno


app = Flask(__name__)
app.secret_key = 'gth_dhd11'
MAIN_DB = "database.db"
app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{MAIN_DB}'
db.init_app(app)



with app.app_context():
        db.create_all()
pattern = r'^[A-Z]{3}/d{4}/d{2}/d{3}$'

registration_bp = Blueprint('registration_bp', __name__)
@registration_bp.route('/registration_success', methods=['GET'])
def registration_success():
    return render_template('registration_success.html')

@registration_bp.route('/register', methods=['GET', 'POST'])
def register():
    form = ''

    if request.method == 'POST':
        account_type = request.form.get('register-selector')
        if account_type == 'studentform':
            firstname = request.form.get('firstname')
            lastname = request.form.get('lastname')
            matricno = request.form.get('matricno')
            sex = request.form.get('sex')
            department = request.form.get('department')
            dorm = request.form.get('dorm')
            password1 = request.form.get('password1')
            password2 = request.form.get('password2')
        
            # Check if matricpattern is valid
            if not re.match(pattern, matricno):
                flash('Invalid matric number format', category='error')
            
            # Check if matricno already exists
            existing_student = Student.query.filter_by(matricno=matricno).first()
            if existing_student:
                flash('Matric Number already exists', category='error')
                
            if len(firstname) < 3:
                flash('Names must be greater than 2 chars', category="error")
            elif len(lastname) < 3:
                flash('Names must be greater than 2 chars', category="error")
            elif password1 != password2:
                flash('Passwords don't match', category="error")
            elif len(password1) < 7:
                flash('Password too short, at least 7 chars', category="error")
            else:
                password = request.form.get('password1')
                hashed_password = generate_password_hash(password)
                new_student = Studentreview(firstname=firstname, lastname=lastname, matricno=matricno, sex=sex, department=department, dorm=dorm ,password=hashed_password)
                db.session.add(new_student)
                db.session.commit()
                # Generate QR code
                qr = segno.make(str(new_student.id))
                qr_image = qr.png(scale=10)
                new_student.qr_code = qr_image
                db.session.commit()
                flash('Account Queued!, visit the admin to Complete your registration', category="success")
                form = 'studentform'
                
            return redirect(url_for('registration_bp.registration_success'))
            
        elif account_type == 'lecturerform':
            username = request.form.get('username')
            lastname = request.form.get('lastname')
            title = request.form.get('title')
            department = request.form.get('department')
            password1 = request.form.get('password1')
            password2 = request.form.get('password2')
                
                # Check if username already exists
            existing_lecturer = Lecturer.query.filter_by(username=username).first()
            if existing_lecturer:
                flash('Username already exists', category='error')
                

                if len(username) < 3:
                    flash('Username too short', category="error")
                elif len(lastname) < 3:
                    flash('Names must be greater than 2 chars', category="error")
                elif password1 != password2:
                    flash('Passwords don't match', category="error")
                elif len(password1) < 7:
                    flash('Password too short, atleast 7 chars', category="error")
                else:
                    password = request.form.get('password1')
                    hashed_password = generate_password_hash(password)

                    new_lecturer = Lecturer_review(username=username, lastname=lastname, title=title, department=department, password=hashed_password)
                    db.session.add(new_lecturer)
                    db.session.commit()
                    registration_success()
                    flash('Account Created Successfully!', category="success")
                    form = 'lecturerform'
                    
                return redirect(url_for('registration_bp.registration_success'))
        
        elif account_type == 'caoform':
             # Code for cao registration
            username = request.form.get('username')
            lastname = request.form.get('lastname')
            title = request.form.get('title')
            password1 = request.form.get('password1')
            password2 = request.form.get('password2')
             # Check if username already exists
            existing_cao = Cao.query.filter_by(username=username).first()
            if existing_cao:
                flash('Username already exists', category='error')

            if len(firstname) < 3:
                flash('Firstname must be greater than 2 chars', category="error")
            elif len(lastname) < 3:
                flash('Lastname must be greater than 2 chars', category="error")
            elif password1 != password2:
                flash('Passwords don't match', category="error")
            elif len(password1) < 7:
                flash('Password too short, at least 7 chars', category="error")
            else:
                password = request.form.get('password1')
                hashed_password = generate_password_hash(password)
                new_cao = Cao_review(username=username, lastname=lastname, title=title , password=hashed_password)
                db.session.add(new_cao)
                db.session.commit()
                flash('Account Created Successfully!', category="success")
                form = 'caoform'
                
            return redirect(url_for('registration_bp.registration_success'))
        
        
    return render_template('register.html', form=form)

app.register_blueprint(registration_bp, methods=['GET', 'POST'])

if __name__ =="__main__":
    app.run('127.0.0.1', debug=True)

This is the route for the register page. i made sure the names of my forms match, theres also a showform function written with javascript but that works well hence why its not in this code. I want to add the models for my tables too but i cant. The issue mostly is the page load, when i fill the forms and press the submit button, the page just reloads instead of redirecting me to the registration_success page or at least show the flash messages. So i suspect the function isnt working as expected, but just cant figure why, remember post 200 is displaying in the terminal whenever i press the submit button.

                                
{% include '_flashes.html' %}


                                <div class="customboot">
                            <div class="container d-flex justify-content-center align-centent">       
              <div class="customselect">
            <div class="form-floating">
                              
              <select class="form-select" id="register-selector" onchange="showForm()">
                                
                                <option value="studentform">Student</option>
                                <option value="lecturerform" >Lecturer</option>
                                <option value="caoform">CA-Officer</option>
                                
                            
                              </select>
                            </div>
              </div>
                
                 
                      
                      
                      <form name="studentform" class="border shadow p-3 rounded"  method="POST", id="studentform" action="{{ url_for('registration_bp.register') }}">
                        <h4>Student Registration form</h4>
                                      <div class="mb-3">
                                       
                                        <input type="text" 
                                        class="form-control" 
                                        name="firstname"
                                        id="firstname1" 
                                        
                                        placeholder="First Name">
                                      </div>

                                       <div class="mb-3">
                                        
                                        <input type="text" 
                                        class="form-control" 
                                        name="lastname"
                                        id="lastname1" 
                                        
                                        placeholder="Last Name">
                                        
                                      </div>
                                      
                                     
                                     <div class="mb-3">
                                       
                                        <input type="text" 
                                        class="form-control" 
                                        name="matricno"
                                        id="matricno" 
                                        
                                        placeholder="ABC/1234/12/123">
                                        
                                              </div>
                                                
                                                
                                                  
                                    
                                    <div class="mb-3">
                                        
                                      <select id="sex1" name="sex">
                                        <option disabled selected value="">Sex</option>
                                        <option value="Male">male</option>
                                         <option value="Female">female</option>
                                      </select>
                                      </div>
                      
                                       <div class="mb-3">
                                       
                                        <input type="text" 
                                        class="form-control" 
                                        name="department"
                                        id="departmemt1" 
                                        
                                        placeholder="Department">
                                        
                                      </div>
                                      
                                      <div class="mb-3">
                                       
                      
                                      <select id="dorm" name="dorm">
                                        <option disabled selected value="">Dorm</option>
                                        <option value="kaaf1up">KAAF1 Up</option>
                                        <option value="kaaf1down">KAAF1 Down</option>
                                         <option value="kaaf2up">KAAF2 Up</option>
                                         <option value="kaaf2down">KAAF2 Down</option>
                                         <option value="lagcen-up">Lagos Central Up</option>
                                         <option value="lagcen-down">Lagos Central Down</option>

                                      </select>
                                      </div>




                                      <div class="mb-3">
                                        
                                        <input type="password" 
                                        class="form-control" 
                                        name="password1"
                                        id="password1"
                                        placeholder="Password">
                                        
                                          </div>
                      
                                           <div class="mb-3">
                                       
                                        <input type="password" 
                                        class="form-control" 
                                        name="password2"
                                        id="password2" 
                                        
                                        placeholder="Confirm Password">
                                        
                                      </div>
                                      
                                      
                                      <button type="submit"  
                                      class="btn btn-primary">Submit</button>
                              
                        </form>
                      
                      
                                  <form name="lecturerform" class="border shadow p-3 rounded" method="POST" id="lecturerform" action="{{ url_for('registration_bp.register') }}" style="display: none;">
                                    <h4>Lecturer Registration form</h4>
                                    <div class="mb-3">
                                      
                                      <input type="text" 
                                      class="form-control" 
                                      name="username"
                                      id="username1" 
                                      placeholder="Username">
                                      
                                      
                                    </div>
                      
                                     <div class="mb-3">
                                      
                                      <input type="text" 
                                      class="form-control" 
                                      name="lastname"
                                      id="lastname2" 
                                      placeholder="Last Name">
                                      
                                      
                                    </div>
                             
                                  <div class="mb-3">
                                     
                      
                                    <select id="title1" name="title">
                                      <option value="" disabled selected>Title</option>
                                      <option value="Mr">Mr</option>
                                       <option value="Miss/Mrs">Miss/Mrs</option>
                                    </select>
                                    </div>
                      
                                     <div class="mb-3">
                                      
                                      <input type="text" 
                                      class="form-control" 
                                      name="department"
                                      id="departmemt2" 
                                      
                                      placeholder="Department">
                                      
                                    </div>
                                    
                                    
                                    <div class="mb-3">
                                     
                                      <input type="password" 
                                      class="form-control" 
                                      name="password1"
                                      id="password3"
                                      placeholder="Password">
                                        </div>
                      
                                         <div class="mb-3">
                                      
                                      <input type="password" 
                                      class="form-control" 
                                      name="password2"
                                      id="password4" 
                                      
                                      placeholder="Confirm Password">
                                      
                                    </div>
                                    
                                    
                                    <button type="submit"  
                                    class="btn btn-primary">Submit</button>

                            </form>
                              


                                <form name="caoform" class="border shadow p-3 rounded" method="POST" id="caoform" action="{{ url_for('registration_bp.register') }}" style="display: none;">
                                  <div class="mb-3">
                                    <h4>C-A Officer Registration form</h4>
                                    <input type="text" 
                                    class="form-control" 
                                    name="username"
                                    id="username2" 
                                    placeholder="Username">
                                   
                                    
                                  </div>
                                   <div class="mb-3">
                                   
                                    <input type="text" 
                                    class="form-control" 
                                    name="lastname"
                                    id="lastname3"
                                    placeholder="Last Name"> 
                                    
                                    
                                  </div>
                                  
                                 
                                
                                            
                                            
                                              
                                
                                <div class="mb-3">
                                    
                      
                                  <select id="title2" name="title">
                                    <option selected disabled value="">Title</option>
                                    <option value="Mr">Mr</option>
                                     <option value="Miss/Mrs">Miss/Mrs</option>
                                  </select>
                                  </div>
                      
                                  
                                  
                                  <div class="mb-3">
                                    
                                    <input type="password" 
                                    class="form-control" 
                                    name="password1"
                                    id="password5"
                                    placeholder="Password">
                                      </div>
                      
                                       <div class="mb-3">
                                    
                                    <input type="password" 
                                    class="form-control" 
                                    name="password2"
                                    id="password6" 
                                    
                                    placeholder="Confirm Password">
                                    
                                  </div>
                                  
                                  
                                      <button type="submit"  
                                      class="btn btn-primary">Submit</button>
                              </form>
                    
                    
                            </div>
                               
                  </div>       
        
    </body>