Delete row sig_8daedb66d991 from signals

id sig_8daedb66d991
event_id evt_b3c900dd7576
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T17:46:04.302036+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:c8b7b75d7c924ffe
throttle_s 0
created_at 2026-04-11T17:46:04.302036+00:00
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