Add SQL insight dashboard widgets

features/dashboard.py

@@ -1,9 +1,56 @@
-from utils import calculate_estimated_1rm, get_exercise_graph_model
+from utils import calculate_estimated_1rm, get_exercise_graph_model, prepare_svg_plot_data
 
 
-class Dashboard:
-    def __init__(self, db_connection_method):
-        self.execute = db_connection_method
+class Dashboard:
+    def __init__(self, db_connection_method):
+        self.execute = db_connection_method
+
+    def get_pinned_widgets(self, person_id):
+        """Execute and prepare the current user's pinned SQL dashboard widgets."""
+        widgets = self.execute("""
+            SELECT
+                w.widget_id,
+                w.saved_query_id AS query_id,
+                w.visualization_type,
+                q.title,
+                q.query
+            FROM dashboard_widget w
+            INNER JOIN saved_query q ON q.id = w.saved_query_id
+            WHERE w.person_id = %s AND w.is_visible = TRUE
+            ORDER BY w.position, w.widget_id
+        """, [person_id]) or []
+
+        prepared_widgets = []
+        for widget in widgets:
+            prepared = dict(widget)
+            prepared['results'] = []
+            prepared['columns'] = []
+            prepared['row_count'] = 0
+            prepared['plot_data'] = None
+            prepared['error'] = None
+
+            try:
+                results = self.execute(widget['query']) or []
+                columns = list(results[0].keys()) if results else []
+                prepared['row_count'] = len(results)
+                prepared['results'] = results[:100]
+                prepared['columns'] = columns
+
+                if widget['visualization_type'] == 'graph' and results:
+                    prepared['plot_data'] = prepare_svg_plot_data(
+                        results[:100], columns, widget['title']
+                    )
+            except Exception as error:
+                # A broken saved query should not take down the Home page.
+                try:
+                    self.execute('ROLLBACK')
+                except Exception:
+                    pass
+                prepared['error'] = str(error)
+
+            prepared_widgets.append(prepared)
+
+        return prepared_widgets
     
     def get_people_ids(self):
         query = """