Delete row sig_11bbee5fa28a from signals

id sig_11bbee5fa28a
event_id evt_fcae397d954f
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_9105f964f ...
dedupe_key signal_enriched:discovery_ipo_delta:e339ae2c6f48a1 ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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