Delete row sig_18528e196e98 from signals

id sig_18528e196e98
event_id evt_fd47afce7f49
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T01:09:33.442591+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:ed144c5aa7b1863f
throttle_s 0
created_at 2026-04-20T01:09:33.442591+00:00
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