Delete row sig_1dbacf9bf1d6 from signals

id sig_1dbacf9bf1d6
event_id evt_9b9085130534
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-15T18:40:50.398402+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:84bebd97ac36241b
throttle_s 0
created_at 2026-04-15T18:40:50.398402+00:00
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