Principal.rb has hardcoded table name on first line (set_table_name 'users'). This error prevents the use of table_name_prefix (config.active_record.table_name_prefix).

Error:
== AddUserPreferencesTimeZone: migrating =====================================
-- add_column(:user_preferences, :time_zone, :string)
-> 0.0041s
== AddUserPreferencesTimeZone: migrated (0.0042s) ============================

== AddUsersType: migrating ===================================================
-- add_column(:users, :type, :string)
-> 0.0048s
rake aborted!
An error has occurred, all later migrations canceled:

Mysql::Error: Table 'redmine.users' doesn't exist: SHOW FIELDS FROM users

Application's environment:
Ruby version 1.8.7 (i686-linux)
RubyGems version 1.3.5
Rack version 1.0
Rails version 2.3.5
Active Record version 2.3.5
Active Resource version 2.3.5
Action Mailer version 2.3.5
Active Support version 2.3.5
Edge Rails revision unknown
Application root /var/lib/redmine
Environment production
Database adapter mysql
Database schema version 0