Delete row sig_81c8b5f58542 from signals

id sig_81c8b5f58542
event_id evt_023180a0878c
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_c71a694778 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_83926ff18 ...
dedupe_key opportunity_artifact:artf_thesis_c71a694778c53309
throttle_s 0
created_at 2026-04-22T10:14:14.501842+00:00
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