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Backend style guide: Document database patterns (#30219) 

* Backend style guide: Document database patterns

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Wording

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Avoid stacked headings

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>
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@ -75,3 +75,17 @@ Valid reasons to use a pointer include (but not necessarily limited to):
allocating heap memory)
* You might *need* `nil` to tell if a variable isn't set, although usually it's better to use the type's zero
value to tell instead
## Database
In database related code, we follow certain patterns.
### Foreign keys
While they can be useful, we don't generally use foreign key constraints in Grafana, for historical and
technical reasons. See this [comment](https://github.com/grafana/grafana/issues/3269#issuecomment-383328548) by Torkel
for context.
### Unique columns
If a column, or column combination, should be unique, add a corresponding uniqueness constraint through a migration.