Delete row sig_99587616f39a from signals

id sig_99587616f39a
event_id evt_aa0c629abf1f
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T18:08:59.392630+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:775f5042815b0b40
throttle_s 0
created_at 2026-04-11T18:08:59.392630+00:00
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