Delete row sig_cd3802648403 from signals

id sig_cd3802648403
event_id evt_bdba88f63db1
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_ba889e9400 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_357c556e7 ...
dedupe_key opportunity_artifact:artf_thesis_ba889e94001f9b3c
throttle_s 0
created_at 2026-04-21T10:41:33.629629+00:00
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