diff --git a/app/controllers/activitypub/inboxes_controller.rb b/app/controllers/activitypub/inboxes_controller.rb
index 291eec19a..0a561e7f0 100644
--- a/app/controllers/activitypub/inboxes_controller.rb
+++ b/app/controllers/activitypub/inboxes_controller.rb
@@ -49,7 +49,7 @@ class ActivityPub::InboxesController < ActivityPub::BaseController
       ResolveAccountWorker.perform_async(signed_request_account.acct)
     end
 
-    DeliveryFailureTracker.track_inverse_success!(signed_request_account)
+    DeliveryFailureTracker.reset!(signed_request_account.inbox_url)
   end
 
   def process_payload
diff --git a/app/controllers/admin/instances_controller.rb b/app/controllers/admin/instances_controller.rb
index 2fc041207..1790becbf 100644
--- a/app/controllers/admin/instances_controller.rb
+++ b/app/controllers/admin/instances_controller.rb
@@ -19,7 +19,7 @@ module Admin
       @followers_count = Follow.where(target_account: Account.where(domain: params[:id])).count
       @reports_count   = Report.where(target_account: Account.where(domain: params[:id])).count
       @blocks_count    = Block.where(target_account: Account.where(domain: params[:id])).count
-      @available       = DeliveryFailureTracker.available?(Account.select(:shared_inbox_url).where(domain: params[:id]).first&.shared_inbox_url)
+      @available       = DeliveryFailureTracker.available?(params[:id])
       @media_storage   = MediaAttachment.where(account: Account.where(domain: params[:id])).sum(:file_file_size)
       @private_comment = @domain_block&.private_comment
       @public_comment  = @domain_block&.public_comment
diff --git a/app/helpers/admin/action_logs_helper.rb b/app/helpers/admin/action_logs_helper.rb
index 88d6e4580..8e398c3b2 100644
--- a/app/helpers/admin/action_logs_helper.rb
+++ b/app/helpers/admin/action_logs_helper.rb
@@ -47,7 +47,7 @@ module Admin::ActionLogsHelper
         I18n.t('admin.action_logs.deleted_status')
       end
     when 'Announcement'
-      truncate(attributes['text'])
+      truncate(attributes['text'].is_a?(Array) ? attributes['text'].last : attributes['text'])
     end
   end
 end
diff --git a/app/javascript/flavours/glitch/components/poll.js b/app/javascript/flavours/glitch/components/poll.js
index 46fd1e8c0..6f57c1950 100644
--- a/app/javascript/flavours/glitch/components/poll.js
+++ b/app/javascript/flavours/glitch/components/poll.js
@@ -4,7 +4,6 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import classNames from 'classnames';
-import { vote, fetchPoll } from 'flavours/glitch/actions/polls';
 import Motion from 'flavours/glitch/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import escapeTextContentForBrowser from 'escape-html';
@@ -28,8 +27,9 @@ class Poll extends ImmutablePureComponent {
   static propTypes = {
     poll: ImmutablePropTypes.map,
     intl: PropTypes.object.isRequired,
-    dispatch: PropTypes.func,
     disabled: PropTypes.bool,
+    refresh: PropTypes.func,
+    onVote: PropTypes.func,
   };
 
   state = {
@@ -100,7 +100,7 @@ class Poll extends ImmutablePureComponent {
       return;
     }
 
-    this.props.dispatch(vote(this.props.poll.get('id'), Object.keys(this.state.selected)));
+    this.props.onVote(Object.keys(this.state.selected));
   };
 
   handleRefresh = () => {
@@ -108,7 +108,7 @@ class Poll extends ImmutablePureComponent {
       return;
     }
 
-    this.props.dispatch(fetchPoll(this.props.poll.get('id')));
+    this.props.refresh();
   };
 
   renderOption (option, optionIndex, showResults) {
diff --git a/app/javascript/flavours/glitch/containers/poll_container.js b/app/javascript/flavours/glitch/containers/poll_container.js
index da93cc905..345351cc6 100644
--- a/app/javascript/flavours/glitch/containers/poll_container.js
+++ b/app/javascript/flavours/glitch/containers/poll_container.js
@@ -1,8 +1,25 @@
 import { connect } from 'react-redux';
+import { debounce } from 'lodash';
+
 import Poll from 'flavours/glitch/components/poll';
+import { fetchPoll, vote } from 'flavours/glitch/actions/polls';
+
+const mapDispatchToProps = (dispatch, { pollId }) => ({
+  refresh: debounce(
+    () => {
+      dispatch(fetchPoll(pollId));
+    },
+    1000,
+    { leading: true },
+  ),
+
+  onVote (choices) {
+    dispatch(vote(pollId, choices));
+  },
+});
 
 const mapStateToProps = (state, { pollId }) => ({
   poll: state.getIn(['polls', pollId]),
 });
 
-export default connect(mapStateToProps)(Poll);
+export default connect(mapStateToProps, mapDispatchToProps)(Poll);
diff --git a/app/javascript/mastodon/components/poll.js b/app/javascript/mastodon/components/poll.js
index 7525a1030..41c99710f 100644
--- a/app/javascript/mastodon/components/poll.js
+++ b/app/javascript/mastodon/components/poll.js
@@ -4,7 +4,6 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import classNames from 'classnames';
-import { vote, fetchPoll } from 'mastodon/actions/polls';
 import Motion from 'mastodon/features/ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import escapeTextContentForBrowser from 'escape-html';
@@ -28,8 +27,9 @@ class Poll extends ImmutablePureComponent {
   static propTypes = {
     poll: ImmutablePropTypes.map,
     intl: PropTypes.object.isRequired,
-    dispatch: PropTypes.func,
     disabled: PropTypes.bool,
+    refresh: PropTypes.func,
+    onVote: PropTypes.func,
   };
 
   state = {
@@ -100,7 +100,7 @@ class Poll extends ImmutablePureComponent {
       return;
     }
 
-    this.props.dispatch(vote(this.props.poll.get('id'), Object.keys(this.state.selected)));
+    this.props.onVote(Object.keys(this.state.selected));
   };
 
   handleRefresh = () => {
@@ -108,7 +108,7 @@ class Poll extends ImmutablePureComponent {
       return;
     }
 
-    this.props.dispatch(fetchPoll(this.props.poll.get('id')));
+    this.props.refresh();
   };
 
   renderOption (option, optionIndex, showResults) {
diff --git a/app/javascript/mastodon/containers/poll_container.js b/app/javascript/mastodon/containers/poll_container.js
index cd7216de7..f40ba8fac 100644
--- a/app/javascript/mastodon/containers/poll_container.js
+++ b/app/javascript/mastodon/containers/poll_container.js
@@ -1,8 +1,25 @@
 import { connect } from 'react-redux';
+import { debounce } from 'lodash';
+
 import Poll from 'mastodon/components/poll';
+import { fetchPoll, vote } from 'mastodon/actions/polls';
+
+const mapDispatchToProps = (dispatch, { pollId }) => ({
+  refresh: debounce(
+    () => {
+      dispatch(fetchPoll(pollId));
+    },
+    1000,
+    { leading: true },
+  ),
+
+  onVote (choices) {
+    dispatch(vote(pollId, choices));
+  },
+});
 
 const mapStateToProps = (state, { pollId }) => ({
   poll: state.getIn(['polls', pollId]),
 });
 
-export default connect(mapStateToProps)(Poll);
+export default connect(mapStateToProps, mapDispatchToProps)(Poll);
diff --git a/app/lib/delivery_failure_tracker.rb b/app/lib/delivery_failure_tracker.rb
index 8d3be35de..25fa694d2 100644
--- a/app/lib/delivery_failure_tracker.rb
+++ b/app/lib/delivery_failure_tracker.rb
@@ -3,47 +3,53 @@
 class DeliveryFailureTracker
   FAILURE_DAYS_THRESHOLD = 7
 
-  def initialize(inbox_url)
-    @inbox_url = inbox_url
+  def initialize(url_or_host)
+    @host = url_or_host.start_with?('https://') || url_or_host.start_with?('http://') ? Addressable::URI.parse(url_or_host).normalized_host : url_or_host
   end
 
   def track_failure!
     Redis.current.sadd(exhausted_deliveries_key, today)
-    Redis.current.sadd('unavailable_inboxes', @inbox_url) if reached_failure_threshold?
+    UnavailableDomain.create(domain: @host) if reached_failure_threshold?
   end
 
   def track_success!
     Redis.current.del(exhausted_deliveries_key)
-    Redis.current.srem('unavailable_inboxes', @inbox_url)
+    UnavailableDomain.find_by(domain: @host)&.destroy
   end
 
   def days
     Redis.current.scard(exhausted_deliveries_key) || 0
   end
 
-  class << self
-    def filter(arr)
-      arr.reject(&method(:unavailable?))
-    end
+  def available?
+    !UnavailableDomain.where(domain: @host).exists?
+  end
 
-    def unavailable?(url)
-      Redis.current.sismember('unavailable_inboxes', url)
+  alias reset! track_success!
+
+  class << self
+    def without_unavailable(urls)
+      unavailable_domains_map = Rails.cache.fetch('unavailable_domains') { UnavailableDomain.pluck(:domain).each_with_object({}) { |domain, hash| hash[domain] = true } }
+
+      urls.reject do |url|
+        host = Addressable::URI.parse(url).normalized_host
+        unavailable_domains_map[host]
+      end
     end
 
     def available?(url)
-      !unavailable?(url)
+      new(url).available?
     end
 
-    def track_inverse_success!(from_account)
-      new(from_account.inbox_url).track_success! if from_account.inbox_url.present?
-      new(from_account.shared_inbox_url).track_success! if from_account.shared_inbox_url.present?
+    def reset!(url)
+      new(url).reset!
     end
   end
 
   private
 
   def exhausted_deliveries_key
-    "exhausted_deliveries:#{@inbox_url}"
+    "exhausted_deliveries:#{@host}"
   end
 
   def today
diff --git a/app/models/account.rb b/app/models/account.rb
index 82d4d10de..e56db3126 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -415,7 +415,7 @@ class Account < ApplicationRecord
 
     def inboxes
       urls = reorder(nil).where(protocol: :activitypub).pluck(Arel.sql("distinct coalesce(nullif(accounts.shared_inbox_url, ''), accounts.inbox_url)"))
-      DeliveryFailureTracker.filter(urls)
+      DeliveryFailureTracker.without_unavailable(urls)
     end
 
     def search_for(terms, limit = 10, offset = 0)
diff --git a/app/models/account_alias.rb b/app/models/account_alias.rb
index 3d0b5d188..792e9e8d4 100644
--- a/app/models/account_alias.rb
+++ b/app/models/account_alias.rb
@@ -16,7 +16,6 @@ class AccountAlias < ApplicationRecord
   belongs_to :account
 
   validates :acct, presence: true, domain: { acct: true }
-  validates :uri, presence: true
   validates :uri, uniqueness: { scope: :account_id }
   validate :validate_target_account
 
@@ -47,7 +46,7 @@ class AccountAlias < ApplicationRecord
   end
 
   def validate_target_account
-    if uri.nil?
+    if uri.blank?
       errors.add(:acct, I18n.t('migrations.errors.not_found'))
     elsif ActivityPub::TagManager.instance.uri_for(account) == uri
       errors.add(:acct, I18n.t('migrations.errors.move_to_self'))
diff --git a/app/models/announcement.rb b/app/models/announcement.rb
index a4e427b49..c493604c2 100644
--- a/app/models/announcement.rb
+++ b/app/models/announcement.rb
@@ -14,7 +14,7 @@
 #  created_at   :datetime         not null
 #  updated_at   :datetime         not null
 #  published_at :datetime
-#  status_ids   :bigint           is an Array
+#  status_ids   :bigint(8)        is an Array
 #
 
 class Announcement < ApplicationRecord
diff --git a/app/models/relay.rb b/app/models/relay.rb
index 8c8a97db3..870f31979 100644
--- a/app/models/relay.rb
+++ b/app/models/relay.rb
@@ -27,7 +27,7 @@ class Relay < ApplicationRecord
     payload     = Oj.dump(follow_activity(activity_id))
 
     update!(state: :pending, follow_activity_id: activity_id)
-    DeliveryFailureTracker.new(inbox_url).track_success!
+    DeliveryFailureTracker.track_success!(inbox_url)
     ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, inbox_url)
   end
 
@@ -36,7 +36,7 @@ class Relay < ApplicationRecord
     payload     = Oj.dump(unfollow_activity(activity_id))
 
     update!(state: :idle, follow_activity_id: nil)
-    DeliveryFailureTracker.new(inbox_url).track_success!
+    DeliveryFailureTracker.track_success!(inbox_url)
     ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, inbox_url)
   end
 
diff --git a/app/models/unavailable_domain.rb b/app/models/unavailable_domain.rb
new file mode 100644
index 000000000..e2918b586
--- /dev/null
+++ b/app/models/unavailable_domain.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+# == Schema Information
+#
+# Table name: unavailable_domains
+#
+#  id         :bigint(8)        not null, primary key
+#  domain     :string           default(""), not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class UnavailableDomain < ApplicationRecord
+  include DomainNormalizable
+
+  after_commit :reset_cache!
+
+  private
+
+  def reset_cache!
+    Rails.cache.delete('unavailable_domains')
+  end
+end
diff --git a/app/views/admin/accounts/show.html.haml b/app/views/admin/accounts/show.html.haml
index 965fd6fb6..408f94eed 100644
--- a/app/views/admin/accounts/show.html.haml
+++ b/app/views/admin/accounts/show.html.haml
@@ -171,12 +171,12 @@
             %th= t('admin.accounts.inbox_url')
             %td
               = @account.inbox_url
-              = fa_icon DeliveryFailureTracker.unavailable?(@account.inbox_url) ? 'times' : 'check'
+              = fa_icon DeliveryFailureTracker.available?(@account.inbox_url) ? 'check' : 'times'
           %tr
             %th= t('admin.accounts.shared_inbox_url')
             %td
               = @account.shared_inbox_url
-              = fa_icon DeliveryFailureTracker.unavailable?(@account.shared_inbox_url) ? 'times' : 'check'
+              = fa_icon DeliveryFailureTracker.available?(@account.shared_inbox_url) ? 'check': 'times'
 
   %div{ style: 'overflow: hidden' }
     %div{ style: 'float: right' }
diff --git a/app/workers/activitypub/delivery_worker.rb b/app/workers/activitypub/delivery_worker.rb
index 196af4af1..14e37dc34 100644
--- a/app/workers/activitypub/delivery_worker.rb
+++ b/app/workers/activitypub/delivery_worker.rb
@@ -12,7 +12,7 @@ class ActivityPub::DeliveryWorker
   HEADERS = { 'Content-Type' => 'application/activity+json' }.freeze
 
   def perform(json, source_account_id, inbox_url, options = {})
-    return if DeliveryFailureTracker.unavailable?(inbox_url)
+    return unless DeliveryFailureTracker.available?(inbox_url)
 
     @options        = options.with_indifferent_access
     @json           = json
@@ -23,10 +23,12 @@ class ActivityPub::DeliveryWorker
 
     perform_request
   ensure
-    if @performed
-      failure_tracker.track_success!
-    else
-      failure_tracker.track_failure!
+    if @inbox_url.present?
+      if @performed
+        failure_tracker.track_success!
+      else
+        failure_tracker.track_failure!
+      end
     end
   end
 
diff --git a/config/initializers/chewy.rb b/config/initializers/chewy.rb
index 9ff0dccc1..18d2f18c1 100644
--- a/config/initializers/chewy.rb
+++ b/config/initializers/chewy.rb
@@ -23,3 +23,9 @@ module Chewy
     end
   end
 end
+
+# ElasticSearch uses Faraday internally. Faraday interprets the
+# http_proxy env variable by default which leads to issues when
+# Mastodon is run with hidden services enabled, because
+# ElasticSearch is *not* supposed to be accessed through a proxy
+Faraday.ignore_env_proxy = true
diff --git a/db/migrate/20200407201300_create_unavailable_domains.rb b/db/migrate/20200407201300_create_unavailable_domains.rb
new file mode 100644
index 000000000..56b477da5
--- /dev/null
+++ b/db/migrate/20200407201300_create_unavailable_domains.rb
@@ -0,0 +1,9 @@
+class CreateUnavailableDomains < ActiveRecord::Migration[5.2]
+  def change
+    create_table :unavailable_domains do |t|
+      t.string :domain, default: '', null: false, index: { unique: true }
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20200407202420_migrate_unavailable_inboxes.rb b/db/migrate/20200407202420_migrate_unavailable_inboxes.rb
new file mode 100644
index 000000000..92a3acb5d
--- /dev/null
+++ b/db/migrate/20200407202420_migrate_unavailable_inboxes.rb
@@ -0,0 +1,21 @@
+class MigrateUnavailableInboxes < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def up
+    urls = Redis.current.smembers('unavailable_inboxes')
+
+    hosts = urls.map do |url|
+      Addressable::URI.parse(url).normalized_host
+    end.compact.uniq
+
+    UnavailableDomain.delete_all
+
+    hosts.each do |host|
+      UnavailableDomain.create(domain: host)
+    end
+
+    Redis.current.del(*(['unavailable_inboxes'] + Redis.current.keys('exhausted_deliveries:*')))
+  end
+
+  def down; end
+end
diff --git a/db/schema.rb b/db/schema.rb
index c294d762b..36e9017b5 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_03_12_185443) do
+ActiveRecord::Schema.define(version: 2020_04_07_202420) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -772,6 +772,13 @@ ActiveRecord::Schema.define(version: 2020_03_12_185443) do
     t.index ["uri"], name: "index_tombstones_on_uri"
   end
 
+  create_table "unavailable_domains", force: :cascade do |t|
+    t.string "domain", default: "", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["domain"], name: "index_unavailable_domains_on_domain", unique: true
+  end
+
   create_table "user_invite_requests", force: :cascade do |t|
     t.bigint "user_id"
     t.text "text"
diff --git a/spec/fabricators/unavailable_domain_fabricator.rb b/spec/fabricators/unavailable_domain_fabricator.rb
new file mode 100644
index 000000000..f661b87c4
--- /dev/null
+++ b/spec/fabricators/unavailable_domain_fabricator.rb
@@ -0,0 +1,3 @@
+Fabricator(:unavailable_domain) do
+  domain { Faker::Internet.domain }
+end
diff --git a/spec/lib/delivery_failure_tracker_spec.rb b/spec/lib/delivery_failure_tracker_spec.rb
index 39c8c7aaf..52a1a92f0 100644
--- a/spec/lib/delivery_failure_tracker_spec.rb
+++ b/spec/lib/delivery_failure_tracker_spec.rb
@@ -22,11 +22,11 @@ describe DeliveryFailureTracker do
 
   describe '#track_failure!' do
     it 'marks URL as unavailable after 7 days of being called' do
-      6.times { |i| Redis.current.sadd('exhausted_deliveries:http://example.com/inbox', i) }
+      6.times { |i| Redis.current.sadd('exhausted_deliveries:example.com', i) }
       subject.track_failure!
 
       expect(subject.days).to eq 7
-      expect(described_class.unavailable?('http://example.com/inbox')).to be true
+      expect(described_class.available?('http://example.com/inbox')).to be false
     end
 
     it 'repeated calls on the same day do not count' do
@@ -37,35 +37,27 @@ describe DeliveryFailureTracker do
     end
   end
 
-  describe '.filter' do
+  describe '.without_unavailable' do
     before do
-      Redis.current.sadd('unavailable_inboxes', 'http://example.com/unavailable/inbox')
+      Fabricate(:unavailable_domain, domain: 'foo.bar')
     end
 
     it 'removes URLs that are unavailable' do
-      result = described_class.filter(['http://example.com/good/inbox', 'http://example.com/unavailable/inbox'])
+      results = described_class.without_unavailable(['http://example.com/good/inbox', 'http://foo.bar/unavailable/inbox'])
 
-      expect(result).to include('http://example.com/good/inbox')
-      expect(result).to_not include('http://example.com/unavailable/inbox')
+      expect(results).to include('http://example.com/good/inbox')
+      expect(results).to_not include('http://foo.bar/unavailable/inbox')
     end
   end
 
-  describe '.track_inverse_success!' do
-    let(:from_account) { Fabricate(:account, inbox_url: 'http://example.com/inbox', shared_inbox_url: 'http://example.com/shared/inbox') }
-
+  describe '.reset!' do
     before do
-      Redis.current.sadd('unavailable_inboxes', 'http://example.com/inbox')
-      Redis.current.sadd('unavailable_inboxes', 'http://example.com/shared/inbox')
-
-      described_class.track_inverse_success!(from_account)
+      Fabricate(:unavailable_domain, domain: 'foo.bar')
+      described_class.reset!('https://foo.bar/inbox')
     end
 
     it 'marks inbox URL as available again' do
-      expect(described_class.available?('http://example.com/inbox')).to be true
-    end
-
-    it 'marks shared inbox URL as available again' do
-      expect(described_class.available?('http://example.com/shared/inbox')).to be true
+      expect(described_class.available?('http://foo.bar/inbox')).to be true
     end
   end
 end
diff --git a/spec/models/unavailable_domain_spec.rb b/spec/models/unavailable_domain_spec.rb
new file mode 100644
index 000000000..3f2621034
--- /dev/null
+++ b/spec/models/unavailable_domain_spec.rb
@@ -0,0 +1,4 @@
+require 'rails_helper'
+
+RSpec.describe UnavailableDomain, type: :model do
+end