Delete row sig_a8b1f8b6ebab from signals

id sig_a8b1f8b6ebab
event_id evt_16910bb3e71f
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T07:54:15.545991+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:cc19ec21e24fa98f
throttle_s 0
created_at 2026-04-19T07:54:15.545991+00:00
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