Delete row sig_0dfeff47d1fb from signals

id sig_0dfeff47d1fb
event_id evt_417659170c32
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_e7d4bd3ac7 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_a4118aa23 ...
dedupe_key opportunity_artifact:artf_thesis_e7d4bd3ac7196601
throttle_s 0
created_at 2026-04-17T03:41:54.580555+00:00
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