Delete row sig_adaacb7385de from signals

id sig_adaacb7385de
event_id evt_a43fb025f9f9
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_0e068a1c29 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_0e0dd8bad ...
dedupe_key opportunity_artifact:artf_thesis_0e068a1c291678f3
throttle_s 0
created_at 2026-04-17T03:26:51.628880+00:00
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