Delete row sig_97df625d96b1 from signals

id sig_97df625d96b1
event_id evt_1b0694733e94
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_8864c68224 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_a998a0b03 ...
dedupe_key opportunity_artifact:artf_thesis_8864c68224b70aa2
throttle_s 0
created_at 2026-04-16T19:31:59.397263+00:00
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