Fix all missing indexes in PostgreSQL

fix.pgsql

-- source: https://www.cybertec-postgresql.com/en/index-your-foreign-key/
WITH missing_indexes AS (
    SELECT c.conrelid::regclass AS "table",
           /* list of key column names in order */
           string_agg(a.attname, ',' ORDER BY x.n) AS columns,
           pg_catalog.pg_size_pretty(
              pg_catalog.pg_relation_size(c.conrelid)
           ) AS size,
           c.conname AS constraint,
           c.confrelid::regclass AS referenced_table
    FROM pg_catalog.pg_constraint c
       /* enumerated key column numbers per foreign key */
       CROSS JOIN LATERAL
          unnest(c.conkey) WITH ORDINALITY AS x(attnum, n)
       /* name for each key column */
       JOIN pg_catalog.pg_attribute a
          ON a.attnum = x.attnum
             AND a.attrelid = c.conrelid
    WHERE NOT EXISTS
            /* is there a matching index for the constraint? */
            (SELECT 1 FROM pg_catalog.pg_index i
             WHERE i.indrelid = c.conrelid
               /* the first index columns must be the same as the
                  key columns, but order doesn't matter */
               AND (i.indkey::smallint[])[0:cardinality(c.conkey)-1]
                   @> c.conkey)
      AND c.contype = 'f'
    GROUP BY c.conrelid, c.conname, c.confrelid
    ORDER BY pg_catalog.pg_relation_size(c.conrelid) DESC
) SELECT
    'CREATE INDEX '||"table"||'_'||columns||' ON '||"table"||'('||columns||');'
FROM missing_indexes
WHERE "table"::varchar NOT IN ('hdb_catalog.event_triggers')