Delete row sig_5b7a549400f1 from signals

id sig_5b7a549400f1
event_id evt_96703337354b
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_af75c994c ...
dedupe_key signal_enriched:discovery_ipo_delta:bc281f22f63ea1 ...
throttle_s 0
created_at 2026-04-08T09:32:58.864102+00:00
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