Delete row sig_a571f821e9f4 from signals

id sig_a571f821e9f4
event_id evt_e37a124de7a0
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_60b92090e ...
dedupe_key signal_enriched:discovery_ipo_delta:e0797de7dcf304 ...
throttle_s 0
created_at 2026-04-10T05:06:44.649475+00:00
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