Delete row sig_b28a844942f8 from signals

id sig_b28a844942f8
event_id evt_659acd94f446
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_bd47819c5 ...
dedupe_key signal_enriched:discovery_crypto_extremes_delta:5f ...
throttle_s 0
created_at 2026-04-20T20:32:04.855080+00:00
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