1 files changed, 51 insertions, 0 deletions
diff --git a/db/post_migrate/20230817111938_swap_events_target_id_to_bigint_for_self_hosts.rb b/db/post_migrate/20230817111938_swap_events_target_id_to_bigint_for_self_hosts.rb
new file mode 100644
index 00000000000..52165bf1dd7
--- /dev/null
+++ b/db/post_migrate/20230817111938_swap_events_target_id_to_bigint_for_self_hosts.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+class SwapEventsTargetIdToBigintForSelfHosts < Gitlab::Database::Migration[2.1]
+  include Gitlab::Database::MigrationHelpers::ConvertToBigint
+
+  disable_ddl_transaction!
+
+  TABLE_NAME = 'events'
+
+  def up
+    return if com_or_dev_or_test_but_not_jh?
+    return if temp_column_removed?(TABLE_NAME, :target_id)
+    return if columns_swapped?(TABLE_NAME, :target_id)
+
+    swap
+  end
+
+  def down
+    return if com_or_dev_or_test_but_not_jh?
+    return if temp_column_removed?(TABLE_NAME, :target_id)
+    return unless columns_swapped?(TABLE_NAME, :target_id)
+
+    swap
+  end
+
+  private
+
+  def swap
+    # This will replace the existing index_events_on_target_type_and_target_id_and_fingerprint
+    add_concurrent_index TABLE_NAME, [:target_type, :target_id_convert_to_bigint, :fingerprint],
+      name: :index_events_on_target_type_and_target_id_bigint_fingerprint,
+      unique: true
+
+    with_lock_retries(raise_on_exhaustion: true) do
+      execute "LOCK TABLE #{TABLE_NAME} IN ACCESS EXCLUSIVE MODE"
+
+      execute "ALTER TABLE #{TABLE_NAME} RENAME COLUMN target_id TO target_id_tmp"
+      execute "ALTER TABLE #{TABLE_NAME} RENAME COLUMN target_id_convert_to_bigint TO target_id"
+      execute "ALTER TABLE #{TABLE_NAME} RENAME COLUMN target_id_tmp TO target_id_convert_to_bigint"
+
+      function_name = Gitlab::Database::UnidirectionalCopyTrigger
+        .on_table(TABLE_NAME, connection: connection)
+        .name(:target_id, :target_id_convert_to_bigint)
+      execute "ALTER FUNCTION #{quote_table_name(function_name)} RESET ALL"
+
+      execute 'DROP INDEX IF EXISTS index_events_on_target_type_and_target_id_and_fingerprint'
+      rename_index TABLE_NAME, 'index_events_on_target_type_and_target_id_bigint_fingerprint',
+        'index_events_on_target_type_and_target_id_and_fingerprint'
+    end
+  end
+end