Goal Find cases where in different schemas there are enumerated or range types with the same name. Types are like words that can be used to construct generalized claims about the real world (table predicates). Better not to duplicate the words in the dictionary. Also make sure that this is not a duplication.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability High (Few or no false-positive results)
License MIT License
Fixing Suggestion Rename a type. In case of duplication drop the duplicates and refactor the database so that the remaining type will be used everywhere it is needed.
Data Source INFORMATION_SCHEMA+system catalog
SQL Query
WITH types AS (SELECT nspname AS type_schema, typname AS type_name, typtype
FROM pg_catalog.pg_type t INNER JOIN pg_catalog.pg_namespace n ON t.typnamespace=n.oid
WHERE typtype IN ('e','r') AND nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL))
SELECT type_name, string_agg(type_schema || '('  || CASE WHEN typtype='e' THEN 'ENUMERATED' ELSE 'RANGE' END || ')',';' ORDER BY type_schema) AS schemas, Count(*) AS number_of_types
FROM types
GROUP BY type_name
HAVING Count(*)>1
ORDER BY type_name;

SQL statements that help generate fixes for the identified problem.

SQL Query to Generate FixDescription
WITH types AS (SELECT nspname AS type_schema, typname AS type_name
FROM pg_catalog.pg_type t INNER JOIN pg_catalog.pg_namespace n ON t.typnamespace=n.oid
WHERE typtype IN ('e','r') AND nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)),
duplicates AS (SELECT type_name
FROM types
GROUP BY type_name
HAVING Count(*)>1)
SELECT format('DROP TYPE %1$I.%2$I;', type_schema, type_name) AS statements
FROM types
WHERE type_name IN (SELECT type_name
FROM duplicates)
ORDER BY type_schema, type_name;
Drop the duplicates.
Collections

This query belongs to the following collections:

NameDescription
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .
Categories

This query is classified under the following categories:

NameDescription
Comfortability of database evolutionQueries of this category provide information about the means that influence database evolution.
Data typesQueries of this category provide information about the data types and their usage.
Duplication of implementation elementsQueries of this catergory provide information about the duplication of the database objects.
NamingQueries of this category provide information about the style of naming.

Further reading and related materials:

Reference
https://refactoring.guru/smells/alternative-classes-with-different-interfaces
https://refactoring.guru/smells/duplicate-code
The corresponding code smell in case of cleaning code is "G5: Duplication". (Robert C. Martin, Clean Code)