Module catalog 

Schema metadata - what labels, properties, and indexes exist.

The catalog is the “dictionary” of your database. When you write (:Person), the catalog maps “Person” to an internal LabelId. This indirection keeps storage compact while names stay readable.

What it tracks	Why it matters
Labels	Maps “Person” → LabelId for efficient storage
Property keys	Maps “name” → PropertyKeyId
Edge types	Maps “KNOWS” → EdgeTypeId
Indexes	Which properties are indexed for fast lookups

Structs

Catalog

The database’s schema dictionary - maps names to compact internal IDs.

IndexDefinition

Index definition.

Enums

CatalogError

Catalog-related errors.

IndexType

Type of index.