Delete row sig_21ae89950f4b from signals

id sig_21ae89950f4b
event_id evt_deecf25d3c12
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-10T22:36:22.340391+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:c3c445e8c4e7df43
throttle_s 0
created_at 2026-04-10T22:36:22.340391+00:00
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