Delete row sig_a530b521b01e from signals

id sig_a530b521b01e
event_id evt_9f4774d5e41f
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T03:13:27.826615+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:f94e42257686ac20
throttle_s 0
created_at 2026-04-12T03:13:27.826615+00:00
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