Hello, Hibernate by default appends escape '' (empty escape character) for PostgreSQL to align like predicates logic with other dbs (since the default escape char would be {{}}). This was introduced with https://hibernate.atlassian.net/browse/HHH-15736.

In your case, looks like something is explicitly configuring the queries to use backslash as an escape character. I suggest you try to reproducer the problem using only Hibernate, you can start from our test case templates. If you won’t be able to, maybe the problem is caused by another component in your application.