Delete row sig_1e507e976247 from signals

id sig_1e507e976247
event_id evt_9b5f508bf715
watcher_id NULL
signal_type discovery_crypto_extremes_delta
value {"aggregator_url":"https://news.bitcoi ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_d0baae3d4 ...
dedupe_key signal_enriched:discovery_crypto_extremes_delta:b6 ...
throttle_s 0
created_at 2026-04-22T12:11:11.616908+00:00
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