CREATE TABLE "conversation_messages" (
  "id" UUID NOT NULL DEFAULT gen_random_uuid(),
  "contact_id" UUID NOT NULL,
  "direction" TEXT NOT NULL,
  "message_type" TEXT NOT NULL DEFAULT 'text',
  "source" TEXT NOT NULL DEFAULT 'agent',
  "body" TEXT NOT NULL,
  "status" TEXT NOT NULL DEFAULT 'sent',
  "sender_user_id" UUID,
  "sender_name" TEXT,
  "external_message_id" TEXT,
  "webhook_event_id" TEXT,
  "occurred_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  "read_at" TIMESTAMP(3),
  "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  "updated_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

  CONSTRAINT "conversation_messages_pkey" PRIMARY KEY ("id"),
  CONSTRAINT "conversation_messages_contact_id_fkey" FOREIGN KEY ("contact_id") REFERENCES "contacts"("id") ON DELETE CASCADE ON UPDATE CASCADE
);

CREATE INDEX "conversation_messages_contact_id_occurred_at_idx" ON "conversation_messages"("contact_id", "occurred_at");
CREATE UNIQUE INDEX "conversation_messages_webhook_event_id_key" ON "conversation_messages"("webhook_event_id");