Delete row sig_27cd690461a9 from signals

id sig_27cd690461a9
event_id evt_cf9fa9563c8c
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_133afb9fdb ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_621b139a4 ...
dedupe_key opportunity_artifact:artf_thesis_133afb9fdbebc1f7
throttle_s 0
created_at 2026-04-17T02:46:46.557287+00:00
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