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# frozen_string_literal: true
class TruncateSbomOccurrences < Gitlab::Database::Migration[2.1]
def up
# Because existing data in the table violates the new
# uniqueness constraints, we need to remove the non-distinct rows.
# Rather than do an expensive and error-prone batch migration
# to find and remove the duplicates, we'll just remove all records
# from the table.
#
# The `cyclonedx_sbom_ingestion` feature flag should
# be OFF in all environments to avoid having more duplicate records
# added between this migration and the one where the new unqiue index
# is added.
# TRUNCATE is a DDL statement (it drops the table and re-creates it), so we want to run the
# migration in DDL mode, but we also don't want to execute it against all schemas because
# it's considered a write operation. So, we'll manually check and skip the migration if
# it's on not `:gitlab_main`.
return unless Gitlab::Database.gitlab_schemas_for_connection(connection).include?(:gitlab_main)
execute('TRUNCATE sbom_occurrences')
end
def down
# no-op
end
end
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