The index module defines two classes, Index and IndexDict, derived from DbSchemaObject and DbObjectDict, respectively.
Class Index is derived from ~pyrseas.dbobject.DbSchemaObject and represents an index on a database table, other than a primary key or unique constraint index. Its keylist attributes are the schema name, the table name and the index name.
An Index has the following attributes: access_method, unique, and keycols.
. automethod:: Index.key_columns
. automethod:: Index.to_map
Class IndexDict is derived from ~pyrseas.dbobject.DbObjectDict and represents the collection of indexes in a database.