Delete row sig_61bffd158aaf from signals

id sig_61bffd158aaf
event_id evt_a5567768c869
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T23:08:56.154634+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:85bfc168d198dd1a
throttle_s 0
created_at 2026-04-20T23:08:56.154634+00:00
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