DROP INDEX IF EXISTS uk_template_tenant_key_version_active; DROP INDEX IF EXISTS uk_template_platform_key_version_active; CREATE UNIQUE INDEX uk_template_scope_key_version_active ON article_templates(scope, tenant_id, template_key, version_no) WHERE deleted_at IS NULL; DROP INDEX IF EXISTS idx_audit_tenant_operator_created; DROP INDEX IF EXISTS idx_quota_reservations_tenant_operator_created; DROP INDEX IF EXISTS idx_quota_ledgers_tenant_operator_created; DROP INDEX IF EXISTS idx_task_record_tenant_operator_created; DROP INDEX IF EXISTS idx_template_assist_tasks_tenant_operator_created; DROP INDEX IF EXISTS idx_generation_task_tenant_operator_created; ALTER TABLE audit_logs DROP COLUMN IF EXISTS error_message, DROP COLUMN IF EXISTS request_id, DROP COLUMN IF EXISTS resource_id, DROP COLUMN IF EXISTS resource_type; UPDATE quota_reservations SET resource_id = 0 WHERE resource_id IS NULL; ALTER TABLE quota_reservations DROP COLUMN IF EXISTS operator_id, ALTER COLUMN resource_id SET NOT NULL; ALTER TABLE tenant_quota_ledgers DROP COLUMN IF EXISTS operator_id; ALTER TABLE task_records DROP COLUMN IF EXISTS operator_id; ALTER TABLE template_assist_tasks DROP COLUMN IF EXISTS operator_id; ALTER TABLE generation_tasks DROP COLUMN IF EXISTS operator_id;