Delete row sig_3a8c9669737b from signals

id sig_3a8c9669737b
event_id evt_c06feac1fb97
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_fa91a10ba6 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_c5df58d1b ...
dedupe_key opportunity_artifact:artf_thesis_fa91a10ba6d1c6aa
throttle_s 0
created_at 2026-04-16T20:36:52.085089+00:00
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