Delete row sig_a18028722981 from signals

id sig_a18028722981
event_id evt_2a5c7b18f473
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T16:16:02.443060+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:dcb0cbf42785dc9a
throttle_s 0
created_at 2026-04-11T16:16:02.443060+00:00
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