Delete row sig_14f39f9dac74 from signals

id sig_14f39f9dac74
event_id evt_49e9117e67f0
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_195f17738d ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_7f7ec87ad ...
dedupe_key opportunity_artifact:artf_thesis_195f17738d8374f6
throttle_s 0
created_at 2026-04-20T19:11:55.520835+00:00
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