Delete row sig_54a7f8e6794f from signals

id sig_54a7f8e6794f
event_id evt_8726a94db48a
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_e1ecf71718 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_c7c8c6b5a ...
dedupe_key opportunity_artifact:artf_thesis_e1ecf71718a8fe31
throttle_s 0
created_at 2026-04-17T08:12:24.436031+00:00
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