Delete row sig_7d0b799b545e from signals

id sig_7d0b799b545e
event_id evt_124f21ca92f1
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_d110c0e0a4 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_1b3800fa7 ...
dedupe_key opportunity_artifact:artf_thesis_d110c0e0a4df9dfc
throttle_s 0
created_at 2026-04-21T09:11:22.800585+00:00
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