Delete row sig_c1e72a4ebdb4 from signals

id sig_c1e72a4ebdb4
event_id evt_7c77abb2b0e2
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T14:11:06.919971+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:9e6fb30a24473567
throttle_s 0
created_at 2026-04-20T14:11:06.919971+00:00
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