Prerequisites

• I have searched for duplicate or closed issues
• I can recreate the issue with all plugins disabled

Describe the issue

When trying to upgrade from 1.6.11 to 1.7_rc1, running update.sh for the first time ends with this:

Updating database schema for roundcube (2025092300)... [FAILED]
ERROR: Error in DDL upgrade 2025092300: [7] ERROR: syntax error at or near ""session_changed_idx""
LINE 1: ALTER TABLE "session" RENAME INDEX "session_changed_idx" TO ...

subsequent tries of update.sh end with this:

Updating database schema for roundcube (2025092300)... [FAILED]
ERROR: Error in DDL upgrade 2025092300: [7] ERROR: column "changed" does not exist

What browser(s) are you seeing the problem on?

No response

What version of PHP are you using?

No response

What version of Roundcube are you using?

1.7_rc1

JavaScript errors

No response

PHP errors

No response