Delete row sig_1777fcfb61ae from signals

id sig_1777fcfb61ae
event_id evt_a6f46f535705
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-09T05:19:45.977483+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:05520bcf0df2a7ac
throttle_s 0
created_at 2026-04-09T05:19:45.977483+00:00
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