-- target_expires_at captures the expiry value computed at first confirmation
-- attempt. Subsequent attempts (e.g. after a crash mid-confirm) read this
-- value back so user mutation stays idempotent.
ALTER TABLE pending_invoices ADD COLUMN target_expires_at TEXT;

CREATE INDEX idx_audit_pubkey ON audit_log(pubkey);
CREATE INDEX idx_audit_created ON audit_log(created_at);
CREATE INDEX idx_webhook_outbox_status ON webhook_outbox(status, created_at);
CREATE INDEX idx_dm_outbox_status ON dm_outbox(status, created_at);