Delete row sig_ffdb28bed675 from signals

id sig_ffdb28bed675
event_id evt_ba8bcd62e19a
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_f07713be2 ...
dedupe_key signal_enriched:discovery_ipo_delta:0548dd336b6d6b ...
throttle_s 0
created_at 2026-04-13T13:25:35.466796+00:00
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