Delete row sig_21e7186b279b from signals

id sig_21e7186b279b
event_id evt_d96ae0b79a97
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T08:26:35.972165+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:366577768882447f
throttle_s 0
created_at 2026-04-18T08:26:35.972165+00:00
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