Add SQL insight dashboard widgets

migrations/2026-09-06_add_dashboard_widgets.sql

@@ -0,0 +1,26 @@
+-- Saved SQL insights can be pinned as live widgets on the home dashboard.
+-- Keep the existing saved_query table compatible with older installations.
+CREATE TABLE IF NOT EXISTS saved_query (
+    id SERIAL PRIMARY KEY,
+    title TEXT NOT NULL,
+    query TEXT NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS dashboard_widget (
+    widget_id SERIAL PRIMARY KEY,
+    person_id INTEGER NOT NULL REFERENCES person(person_id) ON DELETE CASCADE,
+    saved_query_id INTEGER NOT NULL REFERENCES saved_query(id) ON DELETE CASCADE,
+    visualization_type VARCHAR(20) NOT NULL DEFAULT 'table',
+    position INTEGER NOT NULL DEFAULT 0,
+    width INTEGER NOT NULL DEFAULT 1,
+    is_visible BOOLEAN NOT NULL DEFAULT TRUE,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT dashboard_widget_visualization_type_chk
+        CHECK (visualization_type IN ('table', 'graph')),
+    CONSTRAINT dashboard_widget_unique_view
+        UNIQUE (person_id, saved_query_id, visualization_type)
+);
+
+CREATE INDEX IF NOT EXISTS dashboard_widget_person_position_idx
+    ON dashboard_widget (person_id, position, widget_id);