Delete row sig_b5551e1a22f3 from signals

id sig_b5551e1a22f3
event_id evt_9e97a8a87803
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-10T15:04:05.512305+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:c03c397ea0448746
throttle_s 0
created_at 2026-04-10T15:04:05.512305+00:00
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