Per documentation unlogged tables are not crash safe and PG will truncate it when it restarts after a crash. Does this apply to even read only unlogged tables.
For example:
On Monday I load data into unlogged tables.
Then from Tue onwards the table is only read by application.
On Fri morning PG crashes. When it restarts will it truncate all unlogged tables even though they remained
unchanged. I hope it does not.