An initial run 

$ ./merge-myapp
MyAppMerge class does not define the table_handlers() method!

The table_handlers() method should return an arrayref describing how
to handle each table.  The following might be a useful starting point:

$table_handlers = [     # row_count_estimates
    al_links                            => [      0 ],
    attachments                         => [  3_716 ],
    auth_sources                        => [      1 ],
    boards                              => [      2 ],
    burndown_days                       => [      0 ],
    changes                             => [      0 ],
    changeset_parents                   => [      0 ],
    changesets                          => [      0 ],
    changesets_issues                   => [      0 ],
    comments                            => [      0 ],
    custom_fields                       => [      1 ],
    custom_fields_projects              => [      0 ],
    custom_fields_roles                 => [      0 ],
    custom_fields_trackers              => [      1 ],
    custom_values                       => [     38 ],
    documents                           => [     61 ],
    email_addresses                     => [     81 ],
    enabled_modules                     => [    439 ],
    enumerations                        => [     16 ],
    execution_environments              => [      1 ],
    execution_journals                  => [      0 ],
    execution_results                   => [      4 ],
    execution_suite_test_case           => [      0 ],
    execution_suites                    => [      1 ],
    groups_users                        => [     11 ],
    issue_categories                    => [      5 ],
    issue_checklists                    => [  7_089 ],
    issue_relations                     => [    121 ],
    issue_statuses                      => [      5 ],
    issues                              => [  3_519 ],
    journal_details                     => [ 16_054 ],
    journals                            => [ 17_135 ],
    member_roles                        => [    463 ],
    members                             => [    389 ],
    messages                            => [      5 ],
    news                                => [      0 ],
    open_id_authentication_associations => [      0 ],
    open_id_authentication_nonces       => [      0 ],
    projects                            => [     70 ],
    projects_trackers                   => [    805 ],
    queries                             => [      1 ],
    queries_roles                       => [      0 ],
    questions                           => [      0 ],
    rb_issue_history                    => [    702 ],
    rb_journals                         => [ 35_458 ],
    rb_project_settings                 => [     70 ],
    rb_project_story_trackers           => [      0 ],
    rb_project_task_statuses            => [      9 ],
    rb_release_burnchart_day_caches     => [      0 ],
    rb_releases_multiview               => [      0 ],
    rb_sprint_burndown                  => [      0 ],
    rb_story_themes                     => [      0 ],
    releases                            => [      0 ],
    repositories                        => [      0 ],
    roles                               => [      9 ],
    roles_managed_roles                 => [      0 ],
    schema_migrations                   => [    305 ],
    settings                            => [     57 ],
    test_cases                          => [      0 ],
    test_suites                         => [      3 ],
    time_entries                        => [     17 ],
    tokens                              => [     90 ],
    trackers                            => [     26 ],
    user_preferences                    => [     82 ],
    users                               => [     87 ],
    versions                            => [      4 ],
    watchers                            => [  1_231 ],
    wiki_content_versions               => [      3 ],
    wiki_contents                       => [      2 ],
    wiki_pages                          => [      2 ],
    wiki_redirects                      => [      0 ],
    wikis                               => [     47 ],
    workflows                           => [  1_984 ],
];

sub table_handlers { return $table_handlers; }