Delete row sig_fe8ffe1b8111 from signals

id sig_fe8ffe1b8111
event_id evt_485884697769
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_03dd5db7ac ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_3553b81ba ...
dedupe_key opportunity_artifact:artf_thesis_03dd5db7acff3672
throttle_s 0
created_at 2026-04-17T09:27:30.508905+00:00
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