Delete row sig_89b3f48bb039 from signals

id sig_89b3f48bb039
event_id evt_19b82adc9a22
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_e4bcab84d ...
dedupe_key signal_enriched:discovery_ipo_delta:70fb5a05c01759 ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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