Delete row sig_9cf209182fb6 from signals

id sig_9cf209182fb6
event_id evt_6bad2ac7c0b4
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T04:28:49.865618+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:4e53e8fbb77fcbe4
throttle_s 0
created_at 2026-04-21T04:28:49.865618+00:00
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