Delete row sig_2f389192d698 from signals

id sig_2f389192d698
event_id evt_ea89fe7fabee
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T03:13:27.826615+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:fce42bb32430f32a
throttle_s 0
created_at 2026-04-12T03:13:27.826615+00:00
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