docs

docs/source/features/dbcleaning.md

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+Cleaning Your Database
+======================
+RSS Guard is able to work well with huge databases, keeping hundreds of thousands of articles. But, sometimes "well" is not well-enough, right? Big DB files bring RSS Guard into problems sometimes and it is good to regularly remove old, unneeded data from it.
+
+There are two ways of keeping your DB file in good shape.
+
+## Cleaning DB file manually
+Go to `Tools -> Cleanup database` dialog where you will see all options. Hit `OK` to process the DB file. Note that option `Optimize database file` is checked, then database engine will try to shrink database file (`database.db`) to smallest size possible, removing all empty areas from it.
+
+## Cleaning DB file automatically
+There is better and more configurable way of keeping your DB file slim and fit. This feature can be configured application-wide and individually for each feed.
+
+Go to `Tools -> Settings -> Feeds & articles -> Feed fetching -> Limitting amount of articles in feeds` or select some feed and go to `Edit selected items -> Limitting amount of articles in feeds`.
+
+You can select number of newest articles to keep in your feed. Also, you can instruct the feature to not remove your unread/starred articles.
+
+The cleaning action usually runs everytime your feed is fetched.