Delete row sig_c488b598f1f7 from signals

id sig_c488b598f1f7
event_id evt_2f908feac8fc
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_960a5305e0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_6cc6a5d23 ...
dedupe_key opportunity_artifact:artf_thesis_960a5305e0182dbc
throttle_s 0
created_at 2026-04-21T03:55:49.514166+00:00
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