I often prefer the command line.
cd /var/discourse
sudo ./launcher enter app
enter password, then
sudo -u postgres psql discourse
Then, being very careful I run queries like
SELECT table_name, table_type
FROM INFORMATION_SCHEMA.TABLES
WHERE table_catalog = 'discourse'
AND table_schema = 'public';
* currently 138 rows
SELECT table_name, column_name, data_type, column_default, character_maximum_length
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_catalog = 'discourse'
AND table_schema = 'public'
ORDER BY table_name;
* currently 1258 rows, a good idea to have a WHERE table_name = '{{some table name here}}'
or a LIMIT
in that query.