Delete row sig_256f476d561f from signals

id sig_256f476d561f
event_id evt_db11bed4cfa2
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-13T00:04:13.717309+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:731266aaae5bcfc0
throttle_s 0
created_at 2026-04-13T00:04:13.717309+00:00
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