Delete row sig_308ab88464b4 from signals

id sig_308ab88464b4
event_id evt_06fab439a05e
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_63c2a8d50 ...
dedupe_key signal_enriched:discovery_ipo_delta:9e01e884371416 ...
throttle_s 0
created_at 2026-04-22T11:09:42.515872+00:00
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