db9a45c9bc
The previous commit said MTTD was retired. Migration 0256 did retire it, but 0257 restored it at once: what stays is its anchor, the moment Riposte records the alert. The OCSF `time` field is still not read to date detection — that part was right. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>