Delete row sig_478cb676b6f2 from signals

id sig_478cb676b6f2
event_id evt_6771ff30f6d7
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-13T07:09:46.331237+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:bc46555d56a5b81e
throttle_s 0
created_at 2026-04-13T07:09:46.331237+00:00
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