CREATE TABLE "operation_receipts" (
  "id" text PRIMARY KEY NOT NULL,
  "event_id" uuid NOT NULL REFERENCES "events"("id") ON DELETE CASCADE,
  "user_id" text NOT NULL REFERENCES "user"("id") ON DELETE CASCADE,
  "request_hash" text NOT NULL,
  "result" jsonb NOT NULL,
  "created_at" timestamp with time zone DEFAULT now() NOT NULL
);