Delete row sig_6218ee4dc529 from signals

id sig_6218ee4dc529
event_id evt_156418310acb
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_af2f9520ca ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_c4dd9f9e6 ...
dedupe_key opportunity_artifact:artf_thesis_af2f9520caed008e
throttle_s 0
created_at 2026-04-17T06:27:12.559065+00:00
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