Delete row sig_bd152cdf715d from signals

id sig_bd152cdf715d
event_id evt_101c9518741b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T13:54:42.950593+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:69ee5b1a32ed9ee9
throttle_s 0
created_at 2026-04-19T13:54:42.950593+00:00
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