Delete row sig_3117edfcaaf9 from signals

id sig_3117edfcaaf9
event_id evt_523c5731f9d5
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_508e330cc0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_7ee2b3521 ...
dedupe_key opportunity_artifact:artf_thesis_508e330cc0f9ec22
throttle_s 0
created_at 2026-04-17T06:22:11.261558+00:00
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