well…
What is IndexdDB?
It's literally client storage, so you can see db in your browser.
FLAG{y0u_c4n_u3e_db_1n_br0wser}
RUN cd /usr/share/nginx/html && \\
dd if=/dev/random of=2gb.txt bs=1M count=2048 && \\
cat flag.txt >> 2gb.txt && \\
rm flag.txt