Remove the uppercase letters and enhance the filenames (#220)

docs/db-maintenance.md

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+# Database Information and Maintenance
+
+Invidious needs one PostgreSQL database which has the following tables.
+
+- `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
+
+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"
+$ psql invidious -c "TRUNCATE TABLE videos"
+$ exit
+```
+
+For regular maintenance you should add a cronjob for these commands
+```bash
+@weekly psql invidious -c "DELETE FROM nonces * WHERE expire < current_timestamp" > /dev/null
+@weekly psql invidious -c "TRUNCATE TABLE videos" > /dev/null
+```