Delete row sig_a2ca08788398 from signals

id sig_a2ca08788398
event_id evt_79b0d24039c3
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-13T02:37:58.596690+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:f28c7bcc6e369a6e
throttle_s 0
created_at 2026-04-13T02:37:58.596690+00:00
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