Delete row sig_98ae3270edde from signals

id sig_98ae3270edde
event_id evt_e8deb4a269e2
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_ab3ee0ef4b ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_8ad8cf6b0 ...
dedupe_key opportunity_artifact:artf_thesis_ab3ee0ef4be9b04a
throttle_s 0
created_at 2026-04-17T03:26:51.628880+00:00
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