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class AddIndexToSystemNoteMetadata < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
def up
# MySQL automatically creates an index on a foreign-key constraint; PostgreSQL does not
add_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
end
def down
remove_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
end
end
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