Delete row sig_4a4e9531db9a from signals

id sig_4a4e9531db9a
event_id evt_4b7f6f5d75c3
watcher_id NULL
signal_type discovery_crypto_extremes_delta
value {"aggregator_url":"https://www.coingec ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_2c915dee8 ...
dedupe_key signal_enriched:discovery_crypto_extremes_delta:db ...
throttle_s 0
created_at 2026-04-08T00:25:03.933288+00:00
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