Delete row sig_559fedcb8a26 from signals

id sig_559fedcb8a26
event_id evt_c0ccfeaef653
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_71d1efc68 ...
dedupe_key signal_enriched:discovery_ipo_delta:41b02d9da0bf59 ...
throttle_s 0
created_at 2026-04-19T12:46:14.065812+00:00
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