Delete row sig_9b901551814d from signals

id sig_9b901551814d
event_id evt_563ee5ccfbfc
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-14T22:58:03.680427+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:2110697c37550b3f
throttle_s 0
created_at 2026-04-14T22:58:03.680427+00:00
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