feat: add live draw feature and clean up docs

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/supabase/functions/delete-relationship/index.ts

@@ -120,6 +120,12 @@ Deno.serve(async (req) => {
             }
         }
 
+        // Delete live draw sessions for this couple
+        await supabase
+            .from("live_draw_sessions")
+            .delete()
+            .eq("couple_id", coupleId);
+
         // Clear couple_id from both partners' profiles first
         const { error: updateError } = await supabase
             .from("profiles")

apps/supabase/migrations/20260201103117_add_live_draw_sessions.sql

@@ -0,0 +1,28 @@
+-- Live Draw Sessions: persists canvas state for async collaborative drawing
+-- One session per couple - partners draw on a shared canvas throughout the day
+CREATE TABLE IF NOT EXISTS live_draw_sessions (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  couple_id UUID NOT NULL REFERENCES couples(id) ON DELETE CASCADE,
+  strokes JSONB NOT NULL DEFAULT '[]',
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE(couple_id)
+);
+
+-- Enable RLS
+ALTER TABLE live_draw_sessions ENABLE ROW LEVEL SECURITY;
+
+-- Enable realtime for live updates
+ALTER PUBLICATION supabase_realtime ADD TABLE live_draw_sessions;
+
+-- RLS: Only couple members can read their drawing
+CREATE POLICY "Users can view own couple drawings"
+  ON live_draw_sessions FOR SELECT
+  USING (couple_id = get_auth_user_couple_id());
+
+-- RLS: Only couple members can insert/update/delete their drawing
+CREATE POLICY "Users can manage own couple drawings"
+  ON live_draw_sessions FOR ALL
+  USING (couple_id = get_auth_user_couple_id());
+
+CREATE INDEX IF NOT EXISTS idx_live_draw_sessions_couple_id ON live_draw_sessions(couple_id);