diff --git a/app/auth/routes.py b/app/auth/routes.py
index 04c8a10..d533746 100644
--- a/app/auth/routes.py
+++ b/app/auth/routes.py
@@ -1,5 +1,7 @@
-from flask import render_template, flash, redirect, url_for
+from datetime import datetime
+from flask import render_template, flash, redirect, url_for, abort
 from flask_login import login_user, logout_user, current_user, login_required
+
 from app import db
 from app.auth import bp
 from app.models import User
@@ -16,6 +18,7 @@ def login():
             flash('Invalid username or password')
             return redirect(url_for('auth.login'))
         login_user(user, remember=form.remember_me.data)
+        user.last_login = datetime.utcnow()
         return redirect(url_for('main.index'))
     return render_template('auth/login.html', title='Sign In', form=form)
 
@@ -34,8 +37,24 @@ def register():
         user = User(name=form.username.data)
         user.set_password(form.password.data)
         user.set_auth_hash()
+        user.last_login = datetime.utcnow()
         db.session.add(user)
         db.session.commit()
         flash('Congratulations, you are now a registered user!')
         return redirect(url_for('auth.login'))
     return render_template('auth/register.html', title='Register', form=form)
+
+@bp.route('/generate_auth_hash/<username>')
+def generate_auth_hash(username):
+    user = User.query.filter(User.name == username).first_or_404()
+    if not current_user.owns_game_played_by(user):
+        abort(403)
+    if user.auth_hash:
+        flash('Auth hash is already generated')
+        abort(403)
+    if user.last_login:
+        flash('After a player has logged in, it is no longer possible to generate a QR code.')
+        abort(403)
+    user.set_auth_hash()
+    db.session.commit()
+    return 'nothing'
diff --git a/app/main/routes.py b/app/main/routes.py
index f2ade1c..d27ddae 100644
--- a/app/main/routes.py
+++ b/app/main/routes.py
@@ -1,14 +1,22 @@
 import json
+from datetime import datetime
+from io import BytesIO
 import qrcode
 from flask import render_template, flash, redirect, url_for, request, abort, send_file
 from flask_login import current_user, login_required
 from sqlalchemy import and_
-from io import BytesIO
+
 from app import db
 from app.main import bp
 from app.models import User, Game, Role, GamePlayer, Objective, ObjectiveMinimalEncoder, LocationEncoder
 from app.main.forms import CreateGameForm, ObjectiveForm, PlayerAddForm, UserCreateForm, PlayerUpdateForm
 
+@bp.before_app_request
+def before_request():
+    if current_user.is_authenticated:
+        current_user.last_login = datetime.utcnow()
+        db.session.commit()
+
 @bp.route('/')
 @bp.route('/index')
 @login_required
@@ -108,13 +116,19 @@ def user_qrcode(auth_hash):
     user = User.query.filter_by(auth_hash=auth_hash).first_or_404()
     if not current_user.owns_game_played_by(user):
         abort(403)
-    img = generate_qr_code(url_for('main.player', auth_hash=auth_hash, _external=True))
+    if user.last_login:
+        flash('After a player has logged in, it is no longer possible to request their QR code.')
+        abort(403)
+    img = generate_qr_code(url_for('main.user', auth_hash=auth_hash, _external=True))
     return serve_pil_image(img)
 
 @bp.route('/user/<auth_hash>')
 @login_required
 def user(auth_hash):
     user = User.query.filter_by(auth_hash=auth_hash).first_or_404()
+    if user.password_hash:
+        flash('Please login with your username and password!')
+        abort(404)
     return render_template('auth/user.html', title=f'User: {user.name}', user=user)
 
 @bp.route('/game/<game_name>/add_objective', methods=['GET', 'POST'])
diff --git a/app/models/user.py b/app/models/user.py
index 9d15930..47350f9 100644
--- a/app/models/user.py
+++ b/app/models/user.py
@@ -15,6 +15,7 @@ class User(UserMixin, db.Model):
     name = db.Column(db.String(64), unique=True, nullable=False)
     auth_hash = db.Column(db.String(32), unique=True, nullable=True)
     password_hash = db.Column(db.String(128))
+    last_login = db.Column(db.DateTime)
 
     user_games = db.relationship(
         'GamePlayer',
@@ -68,7 +69,7 @@ class User(UserMixin, db.Model):
 
     def owns_game_played_by(self, player):
         '''self is an owner of a game the player participates in'''
-        return self in [gameplayer.player for gameplayers in
+        return self in [gameplayer.user for gameplayers in
                         [game.game_players for game in player.games]
                         for gameplayer in gameplayers if gameplayer.role == Role.owner]
 
diff --git a/app/templates/game_player.html b/app/templates/game_player.html
index 9d5205b..ad08e89 100644
--- a/app/templates/game_player.html
+++ b/app/templates/game_player.html
@@ -21,10 +21,17 @@
                 {{ wtf.form_field(form.submit, class='btn btn-primary', value='Update') }}
             </form>
         </div>
-        {% if user.auth_hash %}
+        
+        {% if user.auth_hash and not user.last_login %}
             <div class="row">
                 <img src="{{ url_for('main.user_qrcode', auth_hash=user.auth_hash) }}" alt="qr_code_failed", width="100%">
             </div>
+        {% elif not user.last_login %}
+            <br>
+            <div class="row">
+                <a href="#", id="generate_auth_hash">
+                    <button class="btn btn-success">Generate Login Code</button></a>
+            </div>
         {% endif %}
     </div>
     <div id="map" style=" height: 600px; border-radius: 10px; " class="col-md-6 col-xs-12"></div>
@@ -60,7 +67,8 @@
         shadowSize: [41, 41]
     });
     
-    var locations = JSON.parse('{{ json.dumps(user.locations_during_game(game)), cls=location_encoder)|safe }}')
+    var locations = JSON.parse('{{ json.dumps(user.locations_during_game(game), cls=location_encoder)|safe }}')
+    if (locations == null) {locations=[]}
     for (var i = 0; i < locations.length; i++){
         var playerMarker = L.marker([
             locations[i]['latitude'],
@@ -80,9 +88,21 @@
      [41.83, -87.62],
      [32.76, -96.72]]
     ];
-    var polyline = L.polyline(locations.map(l => [l.latitude, l.longitude]), {color: 'red'}).addTo(map);
-    // zoom the map to the polyline
-    map.fitBounds(polyline.getBounds());
+    if (locations.length > 0){
+        var polyline = L.polyline(locations.map(l => [l.latitude, l.longitude]), {color: 'red'}).addTo(map);
+        // zoom the map to the polyline
+        map.fitBounds(polyline.getBounds());
+    }
+    
+    //Ajax for Generate Login Code button
+    $(function() {
+        $('a#generate_auth_hash').bind('click', function() {
+            $.ajax({url: "{{ url_for('auth.generate_auth_hash', username=user.name) }}", 
+                success: function(result) {
+                    location.reload();
+                }});
+        });
+    });
 
 </script>
 {% endblock %}
\ No newline at end of file
diff --git a/documentation/database/database_schema1.4.2.drawio b/documentation/database/database_schema1.4.2.drawio
new file mode 100644
index 0000000..375b99b
--- /dev/null
+++ b/documentation/database/database_schema1.4.2.drawio
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/documentation/database/database_schema1.4.2.png b/documentation/database/database_schema1.4.2.png
new file mode 100644
index 0000000..e796048
Binary files /dev/null and b/documentation/database/database_schema1.4.2.png differ
diff --git a/documentation/database/entity_relationship_diagram_v1.4.2.drawio b/documentation/database/entity_relationship_diagram_v1.4.2.drawio
new file mode 100644
index 0000000..99efc9a
--- /dev/null
+++ b/documentation/database/entity_relationship_diagram_v1.4.2.drawio
@@ -0,0 +1 @@
+<mxfile host="office.sciuro.org" modified="2020-07-18T22:25:24.207Z" agent="Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0" etag="wvjCfHbN-iwSZYwNJAo7" version="12.8.6" type="device"><diagram id="C5RBs43oDa-KdzZeNtuy" name="Page-1">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</diagram></mxfile>
\ No newline at end of file
diff --git a/documentation/database/entity_relationship_diagram_v1.4.2.png b/documentation/database/entity_relationship_diagram_v1.4.2.png
new file mode 100644
index 0000000..20ea284
Binary files /dev/null and b/documentation/database/entity_relationship_diagram_v1.4.2.png differ
diff --git a/migrations/versions/1d844798c277_reset_migrations.py b/migrations/versions/fb12ee70fe66_reset_migrations.py
similarity index 97%
rename from migrations/versions/1d844798c277_reset_migrations.py
rename to migrations/versions/fb12ee70fe66_reset_migrations.py
index 99284c8..9ff004d 100644
--- a/migrations/versions/1d844798c277_reset_migrations.py
+++ b/migrations/versions/fb12ee70fe66_reset_migrations.py
@@ -1,8 +1,8 @@
 """reset migrations
 
-Revision ID: 1d844798c277
+Revision ID: fb12ee70fe66
 Revises: 
-Create Date: 2020-07-18 23:47:44.369860
+Create Date: 2020-07-19 00:47:38.970210
 
 """
 from alembic import op
@@ -10,7 +10,7 @@ import sqlalchemy as sa
 
 
 # revision identifiers, used by Alembic.
-revision = '1d844798c277'
+revision = 'fb12ee70fe66'
 down_revision = None
 branch_labels = None
 depends_on = None
@@ -32,6 +32,7 @@ def upgrade():
     sa.Column('name', sa.String(length=64), nullable=False),
     sa.Column('auth_hash', sa.String(length=32), nullable=True),
     sa.Column('password_hash', sa.String(length=128), nullable=True),
+    sa.Column('last_login', sa.DateTime(), nullable=True),
     sa.PrimaryKeyConstraint('id'),
     sa.UniqueConstraint('auth_hash'),
     sa.UniqueConstraint('name')