Delete row sig_cbd444840e4e from signals

id sig_cbd444840e4e
event_id evt_d1c41e616198
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T03:14:17.518654+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:8b6c284e64a3fd97
throttle_s 0
created_at 2026-04-21T03:14:17.518654+00:00
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