#### Relational representation of <catalog> documents

##### Preparation

Hint: A global database connection is configured on IDEA level.

##### Description

Extend the relational schema skeleton Schema/schema.sql preparing your RDBMS to import <catalog> instances.

Extend your project's incomplete Schema/schema.sql file yet containing only INSERT but no CREATE TABLE statements. Try to map the given <catalog> integrity constraints as closely as possible. Use CHECK(...) constraints where appropriate.
• In presence of an image both its name and type must not be NULL.
• In absence of an image both its name and type must be NULL.