Delete row sig_4d9b0cd9f220 from signals

id sig_4d9b0cd9f220
event_id evt_8dbf3845903c
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_6ba873017 ...
dedupe_key signal_enriched:discovery_ipo_delta:da0d9c3b2519ce ...
throttle_s 0
created_at 2026-04-10T13:12:08.706840+00:00
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