Delete row sig_9578718d14f6 from signals

id sig_9578718d14f6
event_id evt_98e25112c33d
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T05:19:05.198913+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:83f6fbbe99da4a23
throttle_s 0
created_at 2026-04-18T05:19:05.198913+00:00
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