Delete row sig_4b320588cc0a from signals

id sig_4b320588cc0a
event_id evt_0063a53ac465
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_255ccd99b ...
dedupe_key signal_enriched:discovery_ipo_delta:edac69e60d9b94 ...
throttle_s 0
created_at 2026-04-18T15:49:14.474663+00:00
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