Delete row sig_a66fab99410b from signals

id sig_a66fab99410b
event_id evt_629fbb57c80b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T17:12:42.351768+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:00682d5a5f1b0c43
throttle_s 0
created_at 2026-04-18T17:12:42.351768+00:00
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