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Update DESIGN-PRINCIPLES.md #237

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Expand Up @@ -250,6 +250,15 @@ The following columns should be present in all tables unless there is a compelli
- one-to-many: unique constraint on the `one` column
- many-to-many: single unique constraint encompassing *both* columns

## Flag Tables

Flag tables are tables that are used to indicate the presence of an attribute on a row in another table. Typically, a flag table is used where that attribute is not shared by all URLs in that table (for example, whether a URL is a Root URL).

Flag tables should have the following characteristics:
- Named with a `flag_` prefix to denote that they are flag tables.
- Contain a foreign key that also exists as the primary key -- a separate "id" key is not required.
- Contain a `created_at` datetime column.

# SQLAlchemy

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