diff --git a/app/models/competition.rb b/app/models/competition.rb
index f3bd7462d1e..493d61b0c44 100644
--- a/app/models/competition.rb
+++ b/app/models/competition.rb
@@ -94,10 +94,6 @@ class Competition < ApplicationRecord
     restricted: 2,
   }, prefix: true
 
-  NEW_REG_SYSTEM_DEFAULT = :v3
-
-  enum :registration_version, [:v1, :v2, :v3], prefix: true, default: NEW_REG_SYSTEM_DEFAULT
-
   CLONEABLE_ATTRIBUTES = %w(
     cityName
     countryId
@@ -171,7 +167,6 @@ class Competition < ApplicationRecord
     waiting_list_deadline_date
     event_change_deadline_date
     competition_series_id
-    registration_version
   ).freeze
   VALID_NAME_RE = /\A([-&.:' [:alnum:]]+) (\d{4})\z/
   VALID_ID_RE = /\A[a-zA-Z0-9]+\Z/
diff --git a/db/migrate/20241209104407_remove_v1_columns.rb b/db/migrate/20241209104407_remove_v1_columns.rb
new file mode 100644
index 00000000000..f713e92a5c5
--- /dev/null
+++ b/db/migrate/20241209104407_remove_v1_columns.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class RemoveV1Columns < ActiveRecord::Migration[7.2]
+  def change
+    remove_column :registrations, :accepted_at
+    remove_column :registrations, :deleted_at
+    remove_column :registrations, :accepted_by
+    remove_column :registrations, :deleted_by
+    remove_column :Competitions, :registration_version
+    drop_table :microservice_registrations
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 76cf2d624c5..2f929d5817f 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[7.2].define(version: 2024_11_24_050607) do
+ActiveRecord::Schema[7.2].define(version: 2024_12_09_104407) do
   create_table "Competitions", id: { type: :string, limit: 32, default: "" }, charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
     t.string "name", limit: 50, default: "", null: false
     t.string "cityName", limit: 50, default: "", null: false
@@ -81,7 +81,6 @@
     t.integer "posting_by"
     t.boolean "forbid_newcomers", default: false, null: false
     t.string "forbid_newcomers_reason"
-    t.integer "registration_version", default: 0, null: false
     t.index ["cancelled_at"], name: "index_Competitions_on_cancelled_at"
     t.index ["countryId"], name: "index_Competitions_on_countryId"
     t.index ["end_date"], name: "index_Competitions_on_end_date"
@@ -794,17 +793,6 @@
     t.datetime "updated_at", precision: nil, null: false
   end
 
-  create_table "microservice_registrations", charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
-    t.string "competition_id", limit: 32, null: false
-    t.integer "user_id", null: false
-    t.text "roles"
-    t.boolean "is_competing", default: true, null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["competition_id", "user_id"], name: "index_microservice_registrations_on_competition_id_and_user_id", unique: true
-    t.index ["user_id"], name: "fk_rails_dc6d05bc5e"
-  end
-
   create_table "oauth_access_grants", id: :integer, charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
     t.integer "resource_owner_id", null: false
     t.integer "application_id", null: false
@@ -1023,10 +1011,6 @@
     t.datetime "created_at", precision: nil, null: false
     t.datetime "updated_at", precision: nil, null: false
     t.integer "guests", default: 0, null: false
-    t.datetime "accepted_at", precision: nil
-    t.integer "accepted_by"
-    t.datetime "deleted_at", precision: nil
-    t.integer "deleted_by"
     t.text "roles"
     t.boolean "is_competing", default: true
     t.text "administrative_notes"
@@ -1394,8 +1378,6 @@
 
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
-  add_foreign_key "microservice_registrations", "Competitions", column: "competition_id", on_update: :cascade, on_delete: :cascade
-  add_foreign_key "microservice_registrations", "users"
   add_foreign_key "oauth_openid_requests", "oauth_access_grants", column: "access_grant_id", on_delete: :cascade
   add_foreign_key "payment_intents", "users", column: "initiated_by_id"
   add_foreign_key "paypal_records", "paypal_records", column: "parent_record_id"
diff --git a/lib/database_dumper.rb b/lib/database_dumper.rb
index 644cb64f34b..05c1f177aa6 100644
--- a/lib/database_dumper.rb
+++ b/lib/database_dumper.rb
@@ -107,7 +107,6 @@ def self.actions_to_column_sanitizers(columns_by_action)
           competition_series_id
           use_wca_live_for_scoretaking
           allow_registration_without_qualification
-          registration_version
           forbid_newcomers
           forbid_newcomers_reason
         ),
@@ -571,12 +570,8 @@ def self.actions_to_column_sanitizers(columns_by_action)
       column_sanitizers: actions_to_column_sanitizers(
         copy: %w(
           id
-          accepted_at
-          accepted_by
           competition_id
           created_at
-          deleted_at
-          deleted_by
           guests
           updated_at
           user_id
@@ -591,7 +586,6 @@ def self.actions_to_column_sanitizers(columns_by_action)
         },
       ),
     }.freeze,
-    "microservice_registrations" => :skip_all_rows,
     "registration_history_changes" => :skip_all_rows,
     "registration_history_entries" => :skip_all_rows,
     "waiting_lists" => {
diff --git a/spec/factories/competitions.rb b/spec/factories/competitions.rb
index b4652efc10d..6ce1a8a1b11 100644
--- a/spec/factories/competitions.rb
+++ b/spec/factories/competitions.rb
@@ -99,8 +99,6 @@
     refund_policy_percent { 0 }
     guests_entry_fee_lowest_denomination { 0 }
 
-    registration_version { :v3 }
-
     trait :enforces_qualifications do
       with_organizer
       qualification_results { true }