Use snowflake ids for collections and their items (#37514)

db/migrate/20260115153219_use_snowflake_ids_for_collections.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class UseSnowflakeIdsForCollections < ActiveRecord::Migration[8.0]
+  def up
+    safety_assured do
+      execute(<<~SQL.squish)
+        ALTER TABLE collections ALTER COLUMN id SET DEFAULT timestamp_id('collections');
+        ALTER TABLE collection_items ALTER COLUMN id SET DEFAULT timestamp_id('collection_items');
+      SQL
+    end
+
+    Mastodon::Snowflake.ensure_id_sequences_exist
+  end
+
+  def down
+    execute(<<~SQL.squish)
+      LOCK collections;
+      SELECT setval('collections_id_seq', (SELECT MAX(id) FROM collections));
+      ALTER TABLE collections ALTER COLUMN id SET DEFAULT nextval('collections_id_seq');
+      LOCK collection_items;
+      SELECT setval('collection_items_id_seq', (SELECT MAX(id) FROM collection_items));
+      ALTER TABLE collection_items ALTER COLUMN id SET DEFAULT nextval('collection_items_id_seq');
+    SQL
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_12_17_091936) do
+ActiveRecord::Schema[8.0].define(version: 2026_01_15_153219) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
@@ -352,7 +352,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_17_091936) do
     t.index ["reference_account_id"], name: "index_canonical_email_blocks_on_reference_account_id"
   end
 
-  create_table "collection_items", force: :cascade do |t|
+  create_table "collection_items", id: :bigint, default: -> { "timestamp_id('collection_items'::text)" }, force: :cascade do |t|
     t.bigint "collection_id", null: false
     t.bigint "account_id"
     t.integer "position", default: 1, null: false
@@ -369,7 +369,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_12_17_091936) do
     t.index ["object_uri"], name: "index_collection_items_on_object_uri", unique: true, where: "(activity_uri IS NOT NULL)"
   end
 
-  create_table "collections", force: :cascade do |t|
+  create_table "collections", id: :bigint, default: -> { "timestamp_id('collections'::text)" }, force: :cascade do |t|
     t.bigint "account_id", null: false
     t.string "name", null: false
     t.text "description", null: false