Delete row sig_c521a7b3229b from signals

id sig_c521a7b3229b
event_id evt_664ec863db54
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_28f3fb9101 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_8f762015c ...
dedupe_key opportunity_artifact:artf_thesis_28f3fb9101f9d170
throttle_s 0
created_at 2026-04-17T08:17:28.778836+00:00
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