Delete row sig_9bf40072163c from signals

id sig_9bf40072163c
event_id evt_7e5bb2218705
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T03:12:50.128623+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:44df05191ce6df37
throttle_s 0
created_at 2026-04-19T03:12:50.128623+00:00
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