Delete row sig_5456497a60a6 from signals

id sig_5456497a60a6
event_id evt_488093277879
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_c62b45e84 ...
dedupe_key signal_enriched:discovery_ipo_delta:bec477c19a58c2 ...
throttle_s 0
created_at 2026-04-17T08:15:09.531669+00:00
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