Delete row sig_bb99a871dbab from signals

id sig_bb99a871dbab
event_id evt_013900631471
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_069de4ed8 ...
dedupe_key signal_enriched:discovery_ipo_delta:075a2aa01fa59a ...
throttle_s 0
created_at 2026-04-19T15:45:47.773233+00:00
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