The command I used for generating our dump was:

    echo '.dump' | sqlite3 ublock0.sqlite | \
      grep -v "cached_asset_content://cache://compiled-" | \
      awk '!/^INSERT/; /^INSERT/ {print $0 | "sort -n"}' | \
      sed 's_\\n_\\n\r\n_g' | \
      sed "/^INSERT INTO \"settings\" VALUES('\(remoteBlacklists\|cached_asset_entries\)'/"'s_,_,\r\n_g' > \
      config/chroot_local-includes/usr/share/tails/ublock-origin/ublock0.dump

The idea is to split lists (including huge strings with escaped
newlines) into separate lines, leaving a CRLF at the end of the line
as a marker -- removing these markers completely restores the file. We
also have to sort the "INSERT" lines since uBlock Origin doesn't save
them in the same order.