Fix kg per week/month for exercise progress graphs and remove useless formula

templates/partials/sparkline.html

@@ -49,7 +49,7 @@
     <h4 class="text-l font-semibold text-blue-400 text-center">{{ title }}</h4>
     <h2 class="text-xs font-semibold text-blue-200 mb-1 text-center" style='font-family: "Computer Modern Sans", sans-serif;'>
         {% if best_fit_formula %}
-        y = {{ best_fit_formula.slope }}x {% if best_fit_formula.intercept != 0 %}+ {{ best_fit_formula.intercept }}{% endif %}, {{ best_fit_formula.kg_per_week }} kg/week, {{ best_fit_formula.kg_per_month }} kg/month
+        {{ best_fit_formula.kg_per_week }} kg/week, {{ best_fit_formula.kg_per_month }} kg/month
         {% endif %}
     </h2>
     <div class="inline-flex rounded-md shadow-sm w-full items-center justify-center mb-1">

utils.py

@@ -279,11 +279,9 @@ def get_exercise_graph_model(title, estimated_1rm, repetitions, weight, start_da
         best_fit_points = list(zip(y_best_fit, relative_positions))
 
         # Convert the slope from scaled units per day to kg per day
-        slope_kg_per_day = m * (max_e1rm - min_e1rm) / total_span
+        slope_kg_per_day = (max_e1rm - min_e1rm) / total_span
 
         best_fit_formula = {
-            'slope': round(m,1),
-            'intercept': round(b,1),
             'kg_per_week': round(slope_kg_per_day * 7, 1),  # Convert to kg/week
             'kg_per_month': round(slope_kg_per_day * 30, 1)  # Convert to kg/month
         }