Add trending links (#16917)

* Add trending links

* Add overriding specific links trendability

* Add link type to preview cards and only trend articles

Change trends review notifications from being sent every 5 minutes to being sent every 2 hours

Change threshold from 5 unique accounts to 15 unique accounts

* Fix tests

5 files changed, 49 insertions, 1 deletions

diff --git a/db/migrate/20211031031021_create_preview_card_providers.rb b/db/migrate/20211031031021_create_preview_card_providers.rb
new file mode 100644
index 00000000000..0bd46198e24
--- /dev/null
+++ b/db/migrate/20211031031021_create_preview_card_providers.rb
@@ -0,0 +1,12 @@
+class CreatePreviewCardProviders < ActiveRecord::Migration[6.1]
+  def change
+    create_table :preview_card_providers do |t|
+      t.string :domain, null: false, default: '', index: { unique: true }
+      t.attachment :icon
+      t.boolean :trendable
+      t.datetime :reviewed_at
+      t.datetime :requested_review_at
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20211112011713_add_language_to_preview_cards.rb b/db/migrate/20211112011713_add_language_to_preview_cards.rb
new file mode 100644
index 00000000000..995934de4c1
--- /dev/null
+++ b/db/migrate/20211112011713_add_language_to_preview_cards.rb
@@ -0,0 +1,7 @@
+class AddLanguageToPreviewCards < ActiveRecord::Migration[6.1]
+  def change
+    add_column :preview_cards, :language, :string
+    add_column :preview_cards, :max_score, :float
+    add_column :preview_cards, :max_score_at, :datetime
+  end
+end
diff --git a/db/migrate/20211115032527_add_trendable_to_preview_cards.rb b/db/migrate/20211115032527_add_trendable_to_preview_cards.rb
new file mode 100644
index 00000000000..87bf3d7a231
--- /dev/null
+++ b/db/migrate/20211115032527_add_trendable_to_preview_cards.rb
@@ -0,0 +1,5 @@
+class AddTrendableToPreviewCards < ActiveRecord::Migration[6.1]
+  def change
+    add_column :preview_cards, :trendable, :boolean
+  end
+end
diff --git a/db/migrate/20211123212714_add_link_type_to_preview_cards.rb b/db/migrate/20211123212714_add_link_type_to_preview_cards.rb
new file mode 100644
index 00000000000..9f57e02194b
--- /dev/null
+++ b/db/migrate/20211123212714_add_link_type_to_preview_cards.rb
@@ -0,0 +1,5 @@
+class AddLinkTypeToPreviewCards < ActiveRecord::Migration[6.1]
+  def change
+    add_column :preview_cards, :link_type, :int
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 2376afff743..00969daf108 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: 2021_08_08_071221) do
+ActiveRecord::Schema.define(version: 2021_11_23_212714) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -689,6 +689,20 @@ ActiveRecord::Schema.define(version: 2021_08_08_071221) do
     t.index ["status_id"], name: "index_polls_on_status_id"
   end
 
+  create_table "preview_card_providers", force: :cascade do |t|
+    t.string "domain", default: "", null: false
+    t.string "icon_file_name"
+    t.string "icon_content_type"
+    t.bigint "icon_file_size"
+    t.datetime "icon_updated_at"
+    t.boolean "trendable"
+    t.datetime "reviewed_at"
+    t.datetime "requested_review_at"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["domain"], name: "index_preview_card_providers_on_domain", unique: true
+  end
+
   create_table "preview_cards", force: :cascade do |t|
     t.string "url", default: "", null: false
     t.string "title", default: "", null: false
@@ -710,6 +724,11 @@ ActiveRecord::Schema.define(version: 2021_08_08_071221) do
     t.string "embed_url", default: "", null: false
     t.integer "image_storage_schema_version"
     t.string "blurhash"
+    t.string "language"
+    t.float "max_score"
+    t.datetime "max_score_at"
+    t.boolean "trendable"
+    t.integer "link_type"
     t.index ["url"], name: "index_preview_cards_on_url", unique: true
   end