Delete row sig_8d8c2371ea60 from signals

id sig_8d8c2371ea60
event_id evt_862d2cae9846
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_04750883e3 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_65877c1f4 ...
dedupe_key opportunity_artifact:artf_thesis_04750883e366553b
throttle_s 0
created_at 2026-04-17T08:17:28.778836+00:00
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