I need to have a table prefix for redmine, so I have put this in the environment.db file:
config.active_record.table_name_prefix = 'rm_'

When I do "rake db:migrate" to initialize redmine, it fails at: SetTopicAuthorsAsWatchers with following message:

==  SetTopicAuthorsAsWatchers: migrating ======================================
rake aborted!
An error has occurred, all later migrations canceled:

Mysql::Error: Table 'my_scheme.watchers' doesn't exist: INSERT INTO watchers (watchable_type, watchable_id, user_id) SELECT DISTINCT 'Message', COALESCE(messages.parent_id, messages.id), messages.author_id FROM messages, users WHERE messages.author_id = users.id AND users.status = 1

Very quick fix is to put the prefix into the INSERT statement. For example, I have prefix rm_ so I change it to:

INSERT INTO rm_watchers ..... FROM rm_messages messages, rm_users users....

I have no time now to find proper solution, I am just writing it here to let you know, that this issue exists.