Delete row sig_55323326125e from signals

id sig_55323326125e
event_id evt_c89735ecaa77
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_b3d720f36 ...
dedupe_key signal_enriched:discovery_ipo_delta:668c67e98bfb34 ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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