Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `README.md`:
  Upstream updated copyright year, we don't mention it so kept our version.
- `app/controllers/admin/dashboard_controller.rb`:
  Not really a conflict, upstream change (removing the spam checker) too close
  to glitch-soc changes. Ported upstream changes.
- `app/models/form/admin_settings.rb`:
  Same.
- `app/services/remove_status_service.rb`:
  Same.
- `app/views/admin/settings/edit.html.haml`:
  Same.
- `config/settings.yml`:
  Same.
- `config/environments/production.rb`:
  Not a real conflict, upstream added a default HTTP header, but we have
  extra headers in glitch-soc.
  Added the header.

db/migrate/20210306164523_account_ids_to_timestamp_ids.rb

@@ -0,0 +1,17 @@
+class AccountIdsToTimestampIds < ActiveRecord::Migration[5.1]
+  def up
+    # Set up the accounts.id column to use our timestamp-based IDs.
+    safety_assured do
+      execute("ALTER TABLE accounts ALTER COLUMN id SET DEFAULT timestamp_id('accounts')")
+    end
+
+    # Make sure we have a sequence to use.
+    Mastodon::Snowflake.ensure_id_sequences_exist
+  end
+
+  def down
+    execute("LOCK accounts")
+    execute("SELECT setval('accounts_id_seq', (SELECT MAX(id) FROM accounts))")
+    execute("ALTER TABLE accounts ALTER COLUMN id SET DEFAULT nextval('accounts_id_seq')")
+  end
+end

db/migrate/20210322164601_create_account_summaries.rb

@@ -0,0 +1,9 @@
+class CreateAccountSummaries < ActiveRecord::Migration[5.2]
+  def change
+    create_view :account_summaries, materialized: true
+
+    # To be able to refresh the view concurrently,
+    # at least one unique index is required
+    safety_assured { add_index :account_summaries, :account_id, unique: true }
+  end
+end

db/migrate/20210323114347_create_follow_recommendations.rb

@@ -0,0 +1,5 @@
+class CreateFollowRecommendations < ActiveRecord::Migration[5.2]
+  def change
+    create_view :follow_recommendations
+  end
+end

db/migrate/20210324171613_create_follow_recommendation_suppressions.rb

@@ -0,0 +1,9 @@
+class CreateFollowRecommendationSuppressions < ActiveRecord::Migration[6.1]
+  def change
+    create_table :follow_recommendation_suppressions do |t|
+      t.references :account, null: false, foreign_key: { on_delete: :cascade }, index: { unique: true }
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20210416200740_create_canonical_email_blocks.rb

@@ -0,0 +1,10 @@
+class CreateCanonicalEmailBlocks < ActiveRecord::Migration[6.1]
+  def change
+    create_table :canonical_email_blocks do |t|
+      t.string :canonical_email_hash, null: false, default: '', index: { unique: true }
+      t.belongs_to :reference_account, null: false, foreign_key: { on_cascade: :delete, to_table: 'accounts' }
+
+      t.timestamps
+    end
+  end
+end