diff --git a/db/migrate/005_tile_tracepoints.rb b/db/migrate/005_tile_tracepoints.rb
index a6e5c9017e..7c3bb8d1cb 100644
--- a/db/migrate/005_tile_tracepoints.rb
+++ b/db/migrate/005_tile_tracepoints.rb
@@ -1,6 +1,10 @@
 require "migrate"
 
 class TileTracepoints < ActiveRecord::Migration[4.2]
+  class Tracepoint < ActiveRecord::Base
+    self.table_name = "gps_points"
+  end
+
   def self.up
     add_column "gps_points", "tile", :bigint
     add_index "gps_points", ["tile"], :name => "points_tile_idx"
diff --git a/db/migrate/006_tile_nodes.rb b/db/migrate/006_tile_nodes.rb
index 70a31fde1a..848dc97241 100644
--- a/db/migrate/006_tile_nodes.rb
+++ b/db/migrate/006_tile_nodes.rb
@@ -1,6 +1,14 @@
 require "migrate"
 
 class TileNodes < ActiveRecord::Migration[4.2]
+  class Node < ActiveRecord::Base
+    self.table_name = "current_nodes"
+  end
+
+  class OldNode < ActiveRecord::Base
+    self.table_name = "nodes"
+  end
+
   def self.upgrade_table(from_table, to_table, model)
     if ENV["USE_DB_FUNCTIONS"]
       execute <<-SQL
diff --git a/db/migrate/013_add_email_valid.rb b/db/migrate/013_add_email_valid.rb
index a45e5928a2..b6899f3300 100644
--- a/db/migrate/013_add_email_valid.rb
+++ b/db/migrate/013_add_email_valid.rb
@@ -1,4 +1,7 @@
 class AddEmailValid < ActiveRecord::Migration[4.2]
+  class User < ActiveRecord::Base
+  end
+
   def self.up
     add_column "users", "email_valid", :boolean, :default => false, :null => false
     User.update_all("email_valid = (active != 0)") # email_valid is :boolean, but active is :integer. "email_valid = active" (see r11802 or earlier) will fail for stricter dbs than mysql
diff --git a/db/migrate/039_add_more_controls_to_gpx_files.rb b/db/migrate/039_add_more_controls_to_gpx_files.rb
index 8cc08cda6d..6ce26588ea 100644
--- a/db/migrate/039_add_more_controls_to_gpx_files.rb
+++ b/db/migrate/039_add_more_controls_to_gpx_files.rb
@@ -1,6 +1,10 @@
 require "migrate"
 
 class AddMoreControlsToGpxFiles < ActiveRecord::Migration[4.2]
+  class Trace < ActiveRecord::Base
+    self.table_name = "gpx_files"
+  end
+
   def self.up
     create_enumeration :gpx_visibility_enum, %w[private public trackable identifiable]
     add_column :gpx_files, :visibility, :gpx_visibility_enum, :default => "public", :null => false
diff --git a/db/migrate/044_create_user_roles.rb b/db/migrate/044_create_user_roles.rb
index b62d8b8905..0098a0086a 100644
--- a/db/migrate/044_create_user_roles.rb
+++ b/db/migrate/044_create_user_roles.rb
@@ -1,6 +1,12 @@
 require "migrate"
 
 class CreateUserRoles < ActiveRecord::Migration[4.2]
+  class User < ActiveRecord::Base
+  end
+
+  class UserRole < ActiveRecord::Base
+  end
+
   def self.up
     create_enumeration :user_role_enum, %w[administrator moderator]
 
diff --git a/db/migrate/046_alter_user_roles_and_blocks.rb b/db/migrate/046_alter_user_roles_and_blocks.rb
index a61c363441..cbd95018d9 100644
--- a/db/migrate/046_alter_user_roles_and_blocks.rb
+++ b/db/migrate/046_alter_user_roles_and_blocks.rb
@@ -1,6 +1,9 @@
 require "migrate"
 
 class AlterUserRolesAndBlocks < ActiveRecord::Migration[4.2]
+  class UserRole < ActiveRecord::Base
+  end
+
   def self.up
     # the initial granter IDs can be "self" - there are none of these
     # in the current live DB, but there may be some in people's own local
diff --git a/db/migrate/051_add_status_to_user.rb b/db/migrate/051_add_status_to_user.rb
index a58f8f8c9e..5cf8a920f5 100644
--- a/db/migrate/051_add_status_to_user.rb
+++ b/db/migrate/051_add_status_to_user.rb
@@ -1,6 +1,9 @@
 require "migrate"
 
 class AddStatusToUser < ActiveRecord::Migration[4.2]
+  class User < ActiveRecord::Base
+  end
+
   def self.up
     create_enumeration :user_status_enum, %w[pending active confirmed suspended deleted]
 
diff --git a/db/migrate/20110322001319_add_terms_seen_to_user.rb b/db/migrate/20110322001319_add_terms_seen_to_user.rb
index 729048bb29..f41782d370 100644
--- a/db/migrate/20110322001319_add_terms_seen_to_user.rb
+++ b/db/migrate/20110322001319_add_terms_seen_to_user.rb
@@ -1,4 +1,7 @@
 class AddTermsSeenToUser < ActiveRecord::Migration[4.2]
+  class User < ActiveRecord::Base
+  end
+
   def self.up
     add_column :users, :terms_seen, :boolean, :null => false, :default => false
 
diff --git a/db/migrate/20120208122334_merge_acl_address_and_mask.rb b/db/migrate/20120208122334_merge_acl_address_and_mask.rb
index 48cdbbc2a9..f05cb4f214 100644
--- a/db/migrate/20120208122334_merge_acl_address_and_mask.rb
+++ b/db/migrate/20120208122334_merge_acl_address_and_mask.rb
@@ -11,6 +11,9 @@ def netmask
 end
 
 class MergeAclAddressAndMask < ActiveRecord::Migration[4.2]
+  class Acl < ActiveRecord::Base
+  end
+
   def up
     Acl.find_each do |acl|
       address = IPAddr.new(acl.address)
diff --git a/db/migrate/20120219161649_add_user_image_fingerprint.rb b/db/migrate/20120219161649_add_user_image_fingerprint.rb
index 1e6a19c21e..c32d187b99 100644
--- a/db/migrate/20120219161649_add_user_image_fingerprint.rb
+++ b/db/migrate/20120219161649_add_user_image_fingerprint.rb
@@ -1,4 +1,7 @@
 class AddUserImageFingerprint < ActiveRecord::Migration[4.2]
+  class User < ActiveRecord::Base
+  end
+
   def up
     add_column :users, :image_fingerprint, :string, :null => true
 
diff --git a/db/migrate/20120808231205_add_counter_caches.rb b/db/migrate/20120808231205_add_counter_caches.rb
index 45cee53315..330e2cea37 100644
--- a/db/migrate/20120808231205_add_counter_caches.rb
+++ b/db/migrate/20120808231205_add_counter_caches.rb
@@ -1,4 +1,11 @@
 class AddCounterCaches < ActiveRecord::Migration[4.2]
+  class Changeset < ActiveRecord::Base
+  end
+
+  class Trace < ActiveRecord::Base
+    self.table_name = "gpx_files"
+  end
+
   def self.up
     add_column :users, :changesets_count, :integer, :null => false, :default => 0
     add_column :users, :traces_count, :integer, :null => false, :default => 0
diff --git a/db/migrate/20121005195010_add_diary_entry_counter_caches.rb b/db/migrate/20121005195010_add_diary_entry_counter_caches.rb
index d145c6bd53..b5e445400d 100644
--- a/db/migrate/20121005195010_add_diary_entry_counter_caches.rb
+++ b/db/migrate/20121005195010_add_diary_entry_counter_caches.rb
@@ -1,4 +1,10 @@
 class AddDiaryEntryCounterCaches < ActiveRecord::Migration[4.2]
+  class DiaryEntry < ActiveRecord::Base
+  end
+
+  class User < ActiveRecord::Base
+  end
+
   def self.up
     add_column :users, :diary_entries_count, :integer, :null => false, :default => 0
 
diff --git a/db/migrate/20121012044047_add_image_use_gravatar_to_users.rb b/db/migrate/20121012044047_add_image_use_gravatar_to_users.rb
index 6099f55469..9e9151a849 100644
--- a/db/migrate/20121012044047_add_image_use_gravatar_to_users.rb
+++ b/db/migrate/20121012044047_add_image_use_gravatar_to_users.rb
@@ -1,4 +1,7 @@
 class AddImageUseGravatarToUsers < ActiveRecord::Migration[4.2]
+  class User < ActiveRecord::Base
+  end
+
   def self.up
     add_column :users, :image_use_gravatar, :boolean, :null => false, :default => false
 
diff --git a/db/migrate/20150111192335_subscribe_old_changesets.rb b/db/migrate/20150111192335_subscribe_old_changesets.rb
index ad23026d01..94b3bb565f 100644
--- a/db/migrate/20150111192335_subscribe_old_changesets.rb
+++ b/db/migrate/20150111192335_subscribe_old_changesets.rb
@@ -1,4 +1,7 @@
 class SubscribeOldChangesets < ActiveRecord::Migration[4.2]
+  class Changeset < ActiveRecord::Base
+  end
+
   def up
     Changeset.find_each do |changeset|
       changeset.subscribers << changeset.user unless changeset.subscribers.exists?(changeset.user.id)
diff --git a/db/migrate/20150222101847_rename_openid_url.rb b/db/migrate/20150222101847_rename_openid_url.rb
index 3b9a8effd5..a12303812f 100644
--- a/db/migrate/20150222101847_rename_openid_url.rb
+++ b/db/migrate/20150222101847_rename_openid_url.rb
@@ -1,4 +1,7 @@
 class RenameOpenidUrl < ActiveRecord::Migration[4.2]
+  class User < ActiveRecord::Base
+  end
+
   def change
     rename_column :users, :openid_url, :auth_uid
     add_column :users, :auth_provider, :string
diff --git a/db/migrate/20161011010929_subscribe_authors_to_diary_entries.rb b/db/migrate/20161011010929_subscribe_authors_to_diary_entries.rb
index a02f52fe88..76fa1fabfe 100644
--- a/db/migrate/20161011010929_subscribe_authors_to_diary_entries.rb
+++ b/db/migrate/20161011010929_subscribe_authors_to_diary_entries.rb
@@ -1,4 +1,7 @@
 class SubscribeAuthorsToDiaryEntries < ActiveRecord::Migration[4.2]
+  class DiaryEntry < ActiveRecord::Base
+  end
+
   def up
     DiaryEntry.find_each do |diary_entry|
       diary_entry.subscriptions.create(:user => diary_entry.user) unless diary_entry.subscribers.exists?(diary_entry.user.id)
diff --git a/db/migrate/20180204153242_tile_users.rb b/db/migrate/20180204153242_tile_users.rb
index cf20aed460..61dbcb4ea5 100644
--- a/db/migrate/20180204153242_tile_users.rb
+++ b/db/migrate/20180204153242_tile_users.rb
@@ -1,4 +1,7 @@
 class TileUsers < ActiveRecord::Migration[5.1]
+  class User < ActiveRecord::Base
+  end
+
   def up
     add_column :users, :home_tile, :bigint
     add_index :users, [:home_tile], :name => "users_home_idx"