Delete row sig_51e050115071 from signals

id sig_51e050115071
event_id evt_c59ba607bc02
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_ea4c6d4cec ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_126260e30 ...
dedupe_key opportunity_artifact:artf_thesis_ea4c6d4cecc64cf1
throttle_s 0
created_at 2026-04-17T03:21:52.530357+00:00
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