Delete row sig_8a4da18c312e from signals

id sig_8a4da18c312e
event_id evt_3747f009242d
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-16T01:10:57.486364+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:8d584ac5db3cfca7
throttle_s 0
created_at 2026-04-16T01:10:57.486364+00:00
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