add statistics

app/__init__.py

@@ -25,4 +25,7 @@ def create_app():
     auth.init_app(app)
     app.register_blueprint(auth.blueprint)
 
+    from . import stats
+    app.register_blueprint(stats.blueprint)
+
     return app

app/stats.py

@@ -0,0 +1,19 @@
+from flask import Blueprint, render_template
+from .db import db, Accomplishment, User
+
+blueprint = Blueprint('stats', __name__)
+
+
+@blueprint.route('/stats')
+def stats():
+    total_accomplishments = Accomplishment.query.count()
+    total_accomplishments_by_me = Accomplishment.query.filter_by(
+        user_id=1).count()
+    total_users = User.query.count()
+
+    return render_template(
+        'stats.html',
+        total=total_accomplishments,
+        total_without_mine=total_accomplishments - total_accomplishments_by_me,
+        total_users=total_users
+    )

app/templates/stats.html

@@ -0,0 +1,9 @@
+{% extends "_skel.html" %}
+{% block title %}Stats{% endblock %}
+{% block content %}
+<div class="max-w-lg mx-auto text-center card">
+    <p><b>Total accomplishments added:</b> {{ total }}<br>
+        <b>Without mine:</b> {{ total_without_mine }}<br>
+        <b>Registered users:</b> {{ total_users }}</p>
+</div>
+{% endblock %}