Delete row sig_a8af8504ccba from signals

id sig_a8af8504ccba
event_id evt_f762ea782ebe
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T06:21:35.973715+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:1b27b1575dd793ab
throttle_s 0
created_at 2026-04-18T06:21:35.973715+00:00
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