Delete row sig_b71b5f8675a8 from signals

id sig_b71b5f8675a8
event_id evt_a612e3a3113e
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T12:05:54.861332+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:9d3f138d2fef3358
throttle_s 0
created_at 2026-04-22T12:05:54.861332+00:00
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