tldraw implementation

supabase/migrations/20260301213013_create_lesson_whiteboard.sql

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+-- CreateTable LessonWhiteboard
+CREATE TABLE "LessonWhiteboard" (
+    "id" SERIAL NOT NULL,
+    "lessonId" INTEGER NOT NULL,
+    "title" TEXT,
+    "plannedSnapshotData" JSONB,
+    "liveSnapshotData" JSONB,
+    "finalSnapshotData" JSONB,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "LessonWhiteboard_pkey" PRIMARY KEY ("id")
+);
+
+-- AddForeignKey
+ALTER TABLE "LessonWhiteboard" ADD CONSTRAINT "LessonWhiteboard_lessonId_fkey" FOREIGN KEY ("lessonId") REFERENCES "Lesson"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "LessonWhiteboard_lessonId_key" ON "LessonWhiteboard"("lessonId");

supabase/migrations/20260301215434_lesson_whiteboard_rls.sql

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+ALTER TABLE "LessonWhiteboard" ENABLE ROW LEVEL SECURITY;
+
+CREATE POLICY "Admins have full access" ON "LessonWhiteboard" FOR ALL USING (is_admin());
+
+CREATE POLICY "Users can view permitted lesson whiteboards" ON "LessonWhiteboard" FOR SELECT USING (
+    is_admin() OR "lessonId" IN (SELECT auth_user_lessons())
+);
+
+CREATE POLICY "Teachers can update lesson whiteboards" ON "LessonWhiteboard" FOR UPDATE USING (
+    is_admin() OR ("lessonId" IN (SELECT auth_user_lessons()) AND requesting_user_role() = 'teacher')
+);
+
+CREATE POLICY "Teachers can insert lesson whiteboards" ON "LessonWhiteboard" FOR INSERT WITH CHECK (
+    is_admin() OR ("lessonId" IN (SELECT auth_user_lessons()) AND requesting_user_role() = 'teacher')
+);