==About this torrent==

This torrent contains the entire image archive of Bronibooru at the time of its
shutdown on March 6, 2021.

Included are the following files:

  README - This file.
  files.sha256 - A file containing the SHA-256 hash of every file in this
                 torrent except for files.sha256.
  s3.sha256 - A file containing the SHA-256 hash of every file contained in
              s3.tar.
  bronibooru.sql.bz2 - A PostgreSQL dump of the database backing Bronibooru.
                       In order to protect the privacy of Bronibooru users, a
                       number of columns and tables have removed or sanitized,
                       so this cannot be used to directly instantiate a new
                       instance of Bronibooru.
  schema.sql - The schema of the Bronibooru database as included in
               bronibooru.sql.bz2.  This is provided for convenience, as the
               full dump, including data, is nearly 93MB uncompressed, which
               may be too large for some text editors.
  s3.tar - A tarball containing the entire contents of the Bronibooru S3
           bucket referenced by the Bronibooru database.

s3.tar contains five directories of (up-to) ~100k images a piece, namely:

  s3/ - All full-sized images stored in the Bronibooru S3 store
  s3/preview/ - Preview images (thumbnails) for each full-sized image
  s3/sample/ - For sufficiently large images, a scaled down sample was
               generated
  s3/preview@2x/ - In 2013, 2x-sized preview images for HiDPI displays were
                   generated in a one-time operation.  Later images were not
                   scaled in this way.
  s3/sample@2x/ - In 2013, 2x-sized sample images for HiDPI displays were
                  generated in a one-time operation.  Later images were not
                  scaled in this way.

==Technical Details==

Bronibooru was built on top of a customized installation of Danbooru that was
last branched from the upstream repository as of commit 1fc96ba, which may be
accessed on GitHub (as of March 10, 2021) at:

https://github.com/danbooru/danbooru/tree/1fc96ba2c3658f5e1335ed9c6e0f1ce16ae8c356

The schema of the database dump included in this torrent is a strict subset of
the schema used in this Danbooru commit.

Modifications to the Bronibooru codebase included adding support for MPO and
SVG files, some of which are still present in s3.tar.  In addition, the
standard Danbooru advertising framework was replaced with custom advertising
code.  None of the images historically used for these ads (ca. 2012-2014) are
included in this dump.

The backend utilized PostgreSQL 9.6 as of the time of its shutdown, requiring
a port of the test_parser extension for full-text search of tags (as Danbooru
required at the time).

Images were originally stored on a single server before being distributed
across a image hosting network of several machines.  By 2013, the site had
been migrated to use an S3 bucket for image storage and retrieval, the contents
of which are replicated in s3.tar.