documentation/Database-Information-and-Maintenance.md

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Invidious needs one PostgreSQL database which has the following tables.
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- `annotations` Caches annotation data if `cache_annotations` is enabled in [`config.yml`](./Configuration)
- `channel_videos` Stores truncated video info, used to create user feeds
- `channels` Stores UCID and author name
- `nonces` Keeps track of tokens issued to prevent CSRF
- `users` Stores user info, such as preferences, username, subscriptions
- `session_ids` Keeps track of user sessions
- `videos` Stores video cache, used to create "top" page
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The table `videos` grows a lot and needs the most storage. You can clean it up using following commands:
```bash
$ sudo -i -u postgres
$ psql invidious -c "DELETE FROM nonces * WHERE expire < current_timestamp"
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$ psql invidious -c "TRUNCATE TABLE videos"
$ exit
```
For regular maintenance you should add a cronjob for these commands
```bash
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@weekly psql invidious -c "DELETE FROM nonces * WHERE expire < current_timestamp" > /dev/null
@weekly psql invidious -c "TRUNCATE TABLE videos" > /dev/null
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```