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-- Links the students with their courses.
CREATE TABLE IF NOT EXISTS /*_*/ep_users_per_course (
  upc_user_id                INT unsigned        NOT NULL, -- Foreign key on ep_user.user_id
  upc_course_id              INT unsigned        NOT NULL, -- Foreign key on ep_courses.course_id
  upc_role                   TINYINT unsigned    NOT NULL, -- The role the user has for the course
  upc_time                   varbinary(14)       NOT NULL -- Time at which the link was made
) /*$wgDBTableOptions*/;


ep_user.user_id doesn't exist. Is this actually the core user table user_id column?