CREATE TABLE "chat_message_bookmarks" (
  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  "company_id" uuid NOT NULL REFERENCES "companies"("id"),
  "message_id" uuid NOT NULL REFERENCES "chat_messages"("id") ON DELETE CASCADE,
  "conversation_id" uuid NOT NULL REFERENCES "chat_conversations"("id") ON DELETE CASCADE,
  "created_at" timestamp with time zone NOT NULL DEFAULT now()
);
CREATE INDEX "chat_bookmarks_company_message_idx" ON "chat_message_bookmarks" ("company_id", "message_id");
CREATE INDEX "chat_bookmarks_company_conv_idx" ON "chat_message_bookmarks" ("company_id", "conversation_id");