Support postgres schemas other than `public`

[MoralCode]

Thank you for building this! I used it during the vaccinatethestates project and now may be able to use it again!

My project currently uses postgres but has most of the data available in a schema other than public

i was able to patch https://github.com/simonw/django-sql-dashboard/blob/422fce166cfd11f1905ed925a94e25c915ba0373/django_sql_dashboard/views.py#L171 to change the schema to the actual name, and this successfully shows the tables in the UI, but clicking into any of them shows errors where the data should be

relation "repo" does not exist LINE 1: select count(*) from repo ^

Are there places that I missed when setting this up? or is something else likely misconfigured? Would love it if you could help point me in the right direction