Delete row sig_85d577da18cc from signals

id sig_85d577da18cc
event_id evt_497eb2395b1e
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_541aaf0cbc ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_206fd90e6 ...
dedupe_key opportunity_artifact:artf_thesis_541aaf0cbc6ab9a2
throttle_s 0
created_at 2026-04-22T13:19:46.639406+00:00
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