Delete row sig_99abb8f77479 from signals

id sig_99abb8f77479
event_id evt_0f630c5fe1b0
watcher_id NULL
signal_type discovery_crypto_extremes_delta
value {"aggregator_url":"https://decrypt.co/ ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_f618635c3 ...
dedupe_key signal_enriched:discovery_crypto_extremes_delta:7e ...
throttle_s 0
created_at 2026-04-09T18:05:02.959642+00:00
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