Delete row sig_442bbba6ffc3 from signals

id sig_442bbba6ffc3
event_id evt_ef9b380afb25
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_d5937cced2 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_71a4f7c08 ...
dedupe_key opportunity_artifact:artf_thesis_d5937cced2c118d4
throttle_s 0
created_at 2026-04-17T05:12:06.212063+00:00
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