Delete row sig_4ccd6e7df9f4 from signals

id sig_4ccd6e7df9f4
event_id evt_5b89c2c45c69
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T18:27:58.230080+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:b20dfbc8348f1984
throttle_s 0
created_at 2026-04-20T18:27:58.230080+00:00
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