Add support for multiple keypairs for remote accounts (#38279)

db/migrate/20260323105645_create_keypairs.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class CreateKeypairs < ActiveRecord::Migration[8.0]
+  def change
+    create_table :keypairs do |t|
+      t.references :account, null: false, foreign_key: { on_delete: :cascade }
+
+      t.string :uri, null: false
+      t.integer :type, null: false
+      t.string :public_key, null: false
+      t.string :private_key
+      t.datetime :expires_at
+      t.boolean :revoked, default: false, null: false
+
+      t.timestamps
+    end
+
+    add_index :keypairs, :uri, unique: true
+  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[8.1].define(version: 2026_03_19_142348) do
+ActiveRecord::Schema[8.1].define(version: 2026_03_23_105645) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
@@ -683,6 +683,20 @@ ActiveRecord::Schema[8.1].define(version: 2026_03_19_142348) do
     t.index ["ip"], name: "index_ip_blocks_on_ip", unique: true
   end
 
+  create_table "keypairs", force: :cascade do |t|
+    t.bigint "account_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "expires_at"
+    t.string "private_key"
+    t.string "public_key", null: false
+    t.boolean "revoked", default: false, null: false
+    t.integer "type", null: false
+    t.datetime "updated_at", null: false
+    t.string "uri", null: false
+    t.index ["account_id"], name: "index_keypairs_on_account_id"
+    t.index ["uri"], name: "index_keypairs_on_uri", unique: true
+  end
+
   create_table "list_accounts", force: :cascade do |t|
     t.bigint "account_id", null: false
     t.bigint "follow_id"
@@ -1492,6 +1506,7 @@ ActiveRecord::Schema[8.1].define(version: 2026_03_19_142348) do
   add_foreign_key "identities", "users", name: "fk_bea040f377", on_delete: :cascade
   add_foreign_key "instance_moderation_notes", "accounts", on_delete: :cascade
   add_foreign_key "invites", "users", on_delete: :cascade
+  add_foreign_key "keypairs", "accounts", on_delete: :cascade
   add_foreign_key "list_accounts", "accounts", on_delete: :cascade
   add_foreign_key "list_accounts", "follow_requests", on_delete: :cascade
   add_foreign_key "list_accounts", "follows", on_delete: :cascade