Delete row sig_9a4551434434 from signals

id sig_9a4551434434
event_id evt_1f2a7c2b9523
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T14:12:37.676517+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:18d4505dab1bb84f
throttle_s 0
created_at 2026-04-18T14:12:37.676517+00:00
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