diff --git a/db/migrate/20130319214458_create_forked_project_links.rb b/db/migrate/20130319214458_create_forked_project_links.rb
index 41b0b700a6f3be9b2934f64790994588de169a6f..065a5e08243bf40da5bd48e3e659f53cf32d901f 100644
--- a/db/migrate/20130319214458_create_forked_project_links.rb
+++ b/db/migrate/20130319214458_create_forked_project_links.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateForkedProjectLinks < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :forked_project_links do |t|
       t.integer :forked_to_project_id, null: false
diff --git a/db/migrate/20130506090604_create_deploy_keys_projects.rb b/db/migrate/20130506090604_create_deploy_keys_projects.rb
index f2e416d3b6fead9995e1f1209d57c91fba2dc10a..8b9662a27c38b5661cf6e457dc67adda472aaf98 100644
--- a/db/migrate/20130506090604_create_deploy_keys_projects.rb
+++ b/db/migrate/20130506090604_create_deploy_keys_projects.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateDeployKeysProjects < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :deploy_keys_projects do |t|
       t.integer :deploy_key_id, null: false
diff --git a/db/migrate/20130617095603_create_users_groups.rb b/db/migrate/20130617095603_create_users_groups.rb
index cb098aa9bf9240f8b079eb2b7de64de4201fb5d5..4ba7d0c9461c4699ab3f38f6e0f33a9c8269142c 100644
--- a/db/migrate/20130617095603_create_users_groups.rb
+++ b/db/migrate/20130617095603_create_users_groups.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateUsersGroups < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :users_groups do |t|
       t.integer :group_access, null: false
diff --git a/db/migrate/20130711063759_create_project_group_links.rb b/db/migrate/20130711063759_create_project_group_links.rb
index 8da7ff6f4cdcb47ec116724854a40d065d978ac9..efccb2aa938b69a0e5b4fb21dc75cad9b6736cdc 100644
--- a/db/migrate/20130711063759_create_project_group_links.rb
+++ b/db/migrate/20130711063759_create_project_group_links.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateProjectGroupLinks < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :project_group_links do |t|
       t.integer :project_id, null: false
diff --git a/db/migrate/20131112114325_create_broadcast_messages.rb b/db/migrate/20131112114325_create_broadcast_messages.rb
index 4ada40f1b661b11f241d6f6bb687fba4f32f8df4..ad2549e53afe88410837b3217fd2d3b417317f8d 100644
--- a/db/migrate/20131112114325_create_broadcast_messages.rb
+++ b/db/migrate/20131112114325_create_broadcast_messages.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateBroadcastMessages < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :broadcast_messages do |t|
       t.text :message, null: false
diff --git a/db/migrate/20140122112253_create_merge_request_diffs.rb b/db/migrate/20140122112253_create_merge_request_diffs.rb
index 68448c915290d5ec848cbac667fb3c319c7ebb94..6c7a92b69503b02ef873f1946f7d859f61b3b905 100644
--- a/db/migrate/20140122112253_create_merge_request_diffs.rb
+++ b/db/migrate/20140122112253_create_merge_request_diffs.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateMergeRequestDiffs < ActiveRecord::Migration
+  DOWNTIME = false
+
   def up
     create_table :merge_request_diffs do |t|
       t.string :state, null: false, default: 'collected'
diff --git a/db/migrate/20140209025651_create_emails.rb b/db/migrate/20140209025651_create_emails.rb
index 48d14682628f9388c27c5cb4f6fca751692e2b29..51886f8fc89e57c58b1601e0d608dea55720dcd7 100644
--- a/db/migrate/20140209025651_create_emails.rb
+++ b/db/migrate/20140209025651_create_emails.rb
@@ -1,10 +1,12 @@
 # rubocop:disable all
 class CreateEmails < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :emails do |t|
       t.integer  :user_id, null: false
       t.string   :email, null: false
-      
+
       t.timestamps null: true
     end
 
diff --git a/db/migrate/20140625115202_create_users_star_projects.rb b/db/migrate/20140625115202_create_users_star_projects.rb
index c50bc4bd6147d0e8d997ed357f1141bedc1463e0..d4f3fe5ac6226bf03fbc5666d3b4b446c5ce3f63 100644
--- a/db/migrate/20140625115202_create_users_star_projects.rb
+++ b/db/migrate/20140625115202_create_users_star_projects.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateUsersStarProjects < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :users_star_projects do |t|
       t.integer :project_id, null: false
diff --git a/db/migrate/20140729134820_create_labels.rb b/db/migrate/20140729134820_create_labels.rb
index 589aced0d7668ce1386c414f83977eb47d7e4ec6..66d20e741a6e3b63f5316ecdf27058336e8703f3 100644
--- a/db/migrate/20140729134820_create_labels.rb
+++ b/db/migrate/20140729134820_create_labels.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateLabels < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :labels do |t|
       t.string :title
diff --git a/db/migrate/20140729140420_create_label_links.rb b/db/migrate/20140729140420_create_label_links.rb
index abdbaa1bd1a35a8786eb31263a29ff96829b165d..dacd9f2e4b6a9d9eba6075733976d94c5cc7062b 100644
--- a/db/migrate/20140729140420_create_label_links.rb
+++ b/db/migrate/20140729140420_create_label_links.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateLabelLinks < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :label_links do |t|
       t.integer :label_id
diff --git a/db/migrate/20140914113604_add_members_table.rb b/db/migrate/20140914113604_add_members_table.rb
index fb0876dd520d12953e16e3b1f3fbbd93682ed2dd..0f76bb0ef7960f4c9918b314a294e2fefc745da6 100644
--- a/db/migrate/20140914113604_add_members_table.rb
+++ b/db/migrate/20140914113604_add_members_table.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class AddMembersTable < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :members do |t|
       t.integer :access_level, null: false
diff --git a/db/migrate/20140914173417_remove_old_member_tables.rb b/db/migrate/20140914173417_remove_old_member_tables.rb
index 067dc21ccf15f653c785a64b8853960580965f9e..d2ab326ef1fb936ee7a46f6f78c9f1a17f9416e4 100644
--- a/db/migrate/20140914173417_remove_old_member_tables.rb
+++ b/db/migrate/20140914173417_remove_old_member_tables.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class RemoveOldMemberTables < ActiveRecord::Migration
+  DOWNTIME = false
+
   def up
     drop_table :users_groups
     drop_table :users_projects
diff --git a/db/migrate/20141118150935_add_audit_event.rb b/db/migrate/20141118150935_add_audit_event.rb
index f0452f464591f6b7a7dbdbc24fc2224c1dbcbaec..52d70b4a0ac693ae75bac5a4e719acd33d64db20 100644
--- a/db/migrate/20141118150935_add_audit_event.rb
+++ b/db/migrate/20141118150935_add_audit_event.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class AddAuditEvent < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :audit_events do |t|
       t.integer :author_id, null: false
diff --git a/db/migrate/20141216155758_create_doorkeeper_tables.rb b/db/migrate/20141216155758_create_doorkeeper_tables.rb
index 1c4d32e133ca33ab8ff97c4cc8be0bd0dc06813b..17e45a77291ffc41cc5c0e04407ba0623d0e9b57 100644
--- a/db/migrate/20141216155758_create_doorkeeper_tables.rb
+++ b/db/migrate/20141216155758_create_doorkeeper_tables.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateDoorkeeperTables < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :oauth_applications do |t|
       t.string  :name,         null: false
diff --git a/db/migrate/20150108073740_create_application_settings.rb b/db/migrate/20150108073740_create_application_settings.rb
index c26a7c3957475f78d06e95e4261dd22362778e78..0e4c66ca8c02a6194de16ac240878d247249442a 100644
--- a/db/migrate/20150108073740_create_application_settings.rb
+++ b/db/migrate/20150108073740_create_application_settings.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateApplicationSettings < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :application_settings do |t|
       t.integer :default_projects_limit
diff --git a/db/migrate/20150313012111_create_subscriptions_table.rb b/db/migrate/20150313012111_create_subscriptions_table.rb
index 0977c9adfecf1589ac707f17201866bb4395aaa5..a9a8435330df2f34b8a69a2029dc4be00e8bfaae 100644
--- a/db/migrate/20150313012111_create_subscriptions_table.rb
+++ b/db/migrate/20150313012111_create_subscriptions_table.rb
@@ -1,15 +1,17 @@
 # rubocop:disable all
 class CreateSubscriptionsTable < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :subscriptions do |t|
       t.integer :user_id
       t.references :subscribable, polymorphic: true
       t.boolean :subscribed
-      
+
       t.timestamps null: true
     end
 
-    add_index :subscriptions, 
+    add_index :subscriptions,
               [:subscribable_id, :subscribable_type, :user_id],
               unique: true,
               name: 'subscriptions_user_id_and_ref_fields'
diff --git a/db/migrate/20150806104937_create_abuse_reports.rb b/db/migrate/20150806104937_create_abuse_reports.rb
index 9f1512db8625e0000e8c8321beb6e5d3dab5e79b..52aed9e1d1d79faaa814db60b6fc41449e0c58b5 100644
--- a/db/migrate/20150806104937_create_abuse_reports.rb
+++ b/db/migrate/20150806104937_create_abuse_reports.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateAbuseReports < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :abuse_reports do |t|
       t.integer :reporter_id
diff --git a/db/migrate/20151103134857_create_lfs_objects.rb b/db/migrate/20151103134857_create_lfs_objects.rb
index fadaf637cec48b10a3e511e102692438b8daa8ca..db6fa27199bd9a2edb8d73c84411b5247952a893 100644
--- a/db/migrate/20151103134857_create_lfs_objects.rb
+++ b/db/migrate/20151103134857_create_lfs_objects.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateLfsObjects < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :lfs_objects do |t|
       t.string :oid, null: false, unique: true
diff --git a/db/migrate/20151103134958_create_lfs_objects_projects.rb b/db/migrate/20151103134958_create_lfs_objects_projects.rb
index e830cbe4656dde6d1ed4af33fb3512d63a55af49..5af1c39fd9cfcf7e7a49895b3759b9e7e7c02d8e 100644
--- a/db/migrate/20151103134958_create_lfs_objects_projects.rb
+++ b/db/migrate/20151103134958_create_lfs_objects_projects.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateLfsObjectsProjects < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :lfs_objects_projects do |t|
       t.integer :lfs_object_id, null: false
diff --git a/db/migrate/20151105094515_create_releases.rb b/db/migrate/20151105094515_create_releases.rb
index 87f692c64d00eae63a1ef460bf23e42f99d021a0..34dd7a10942bbc67a846ba2a2e54d0af6601494a 100644
--- a/db/migrate/20151105094515_create_releases.rb
+++ b/db/migrate/20151105094515_create_releases.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateReleases < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :releases do |t|
       t.string :tag
diff --git a/db/migrate/20160212123307_create_tasks.rb b/db/migrate/20160212123307_create_tasks.rb
index 8b5b1dd694d545c6add8e5ea3dbb1ea326def942..cd3ad0e4cd8d9137712bdb49591d6adc9e2d9bb6 100644
--- a/db/migrate/20160212123307_create_tasks.rb
+++ b/db/migrate/20160212123307_create_tasks.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class CreateTasks < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :tasks do |t|
       t.references :user, null: false, index: true
diff --git a/db/migrate/20160416180807_add_award_emoji.rb b/db/migrate/20160416180807_add_award_emoji.rb
index c0957f028a88b2fb61e64ada8cb64ae0e5a0ef8c..0d252e5044e8a523778f91b1f6947b384ca6cec3 100644
--- a/db/migrate/20160416180807_add_award_emoji.rb
+++ b/db/migrate/20160416180807_add_award_emoji.rb
@@ -1,5 +1,7 @@
 # rubocop:disable all
 class AddAwardEmoji < ActiveRecord::Migration
+  DOWNTIME = false
+
   def change
     create_table :award_emoji do |t|
       t.string :name