Delete row sig_20dfc47d11c5 from signals

id sig_20dfc47d11c5
event_id evt_692249e16075
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-10T23:49:24.363681+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:701733f0570a9b93
throttle_s 0
created_at 2026-04-10T23:49:24.363681+00:00
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