diff --git a/backend/supabase/migrations/007_add_deadlines_dashboard_index.sql b/backend/supabase/migrations/007_add_deadlines_dashboard_index.sql
new file mode 100644
index 0000000..34e0710
--- /dev/null
+++ b/backend/supabase/migrations/007_add_deadlines_dashboard_index.sql
@@ -0,0 +1,6 @@
+-- Migration: Add composite index for deadline dashboard queries
+-- This index optimizes queries that filter by case_id, date range, and status
+-- Common dashboard queries: WHERE case_id = ? AND deadline_date BETWEEN ? AND ? AND status = ?
+
+CREATE INDEX IF NOT EXISTS idx_deadlines_case_date_status 
+ON deadlines(case_id, deadline_date, status);
\ No newline at end of file