Delete row sig_df75b25bb2d1 from signals

id sig_df75b25bb2d1
event_id evt_60c407700e2a
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_569c05d61 ...
dedupe_key signal_enriched:discovery_ipo_delta:896bf3289c252f ...
throttle_s 0
created_at 2026-04-08T11:34:02.408899+00:00
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