Delete row sig_bb90ccfb6943 from signals

id sig_bb90ccfb6943
event_id evt_6515248d1b10
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_3a7b21a9f ...
dedupe_key signal_enriched:discovery_ipo_delta:5016e7b3455098 ...
throttle_s 0
created_at 2026-04-16T06:11:20.111289+00:00
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