Delete row sig_d491fb9f139c from signals

id sig_d491fb9f139c
event_id evt_470f3ed043df
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T19:13:25.593261+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:28769de7f70b76c5
throttle_s 0
created_at 2026-04-20T19:13:25.593261+00:00
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