Delete row sig_66d657d9e9ef from signals

id sig_66d657d9e9ef
event_id evt_0d1b47e48b22
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T23:04:29.892836+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:6fc1d50c8f15f65f
throttle_s 0
created_at 2026-04-19T23:04:29.892836+00:00
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