Delete row sig_4cf1ef8f8918 from signals

id sig_4cf1ef8f8918
event_id evt_fdbd4cb0c204
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T11:14:27.594517+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:888641efc048728f
throttle_s 0
created_at 2026-04-21T11:14:27.594517+00:00
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