Delete row sig_8afc0877540d from signals

id sig_8afc0877540d
event_id evt_7453a3baad71
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T21:09:02.336445+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:f78ea62ab84e8c23
throttle_s 0
created_at 2026-04-11T21:09:02.336445+00:00
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