Delete row sig_61799ad316bc from signals

id sig_61799ad316bc
event_id evt_97a018d8f11e
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T23:02:35.102459+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:9a1cd346b4f23a06
throttle_s 0
created_at 2026-04-11T23:02:35.102459+00:00
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