Delete row sig_1d259ccb94a8 from signals

id sig_1d259ccb94a8
event_id evt_fff67d5425bb
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_e3f6aada8 ...
dedupe_key signal_enriched:discovery_ipo_delta:c1d7505e7153b6 ...
throttle_s 0
created_at 2026-04-05T20:01:16.938378+00:00
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