Delete row sig_355240c4debd from signals

id sig_355240c4debd
event_id evt_b7d8350c3ca9
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_7bd136b03 ...
dedupe_key signal_enriched:discovery_crypto_extremes_delta:02 ...
throttle_s 0
created_at 2026-04-06T18:42:37.816572+00:00
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