Delete row sig_9c47593cc916 from signals

id sig_9c47593cc916
event_id evt_e30267a16419
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_cdf7db0b2 ...
dedupe_key signal_enriched:discovery_ipo_delta:56c3e85603a672 ...
throttle_s 0
created_at 2026-04-10T13:12:08.706840+00:00
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