Comment by kakwa_

It's not the case, the PRs, bug tracking and other metadata are stored inside an SQL database:

Here are the tables on my at home deployment:

  mysql> show tables
      -> ;
  +---------------------------+
  | Tables_in_gogs            |
  +---------------------------+
  | action                    |
  | attachment                |
  | collaboration             |
  | comment                   |
  | commit_status             |
  | deleted_branch            |
  | issue                     |
  | issue_assignees           |
  | issue_user                |
  | milestone                 |
  | mirror                    |
  | notice                    |
  | notification              |
  | oauth2_application        |
  | org_user                  |
  | protect_branch            |
  | public_key                |
  | pull_request              |
  | release                   |
  | repo_indexer_status       |
  | repository                |
  | review                    |
  | star                      |
  | stopwatch                 |
  | task                      |
  | team                      |
  | topic                     |
  | tracked_time              |
  | update_task               |
  | upload                    |
  | user                      |
  | watch                     |
  | webhook                   |
  | [...]                     |
  +---------------------------+
  67 rows in set (0.01 sec)

Edit: delete a few lines in the list of tables, it was way too long for an HN post...