Delete row sig_392b209a76ac from signals

id sig_392b209a76ac
event_id evt_9b2a2749cddd
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_f6ff01174c ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_aa4ea0568 ...
dedupe_key opportunity_artifact:artf_thesis_f6ff01174c6bd3db
throttle_s 0
created_at 2026-04-17T05:12:06.212063+00:00
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