Delete row sig_a51ca52b40b9 from signals

id sig_a51ca52b40b9
event_id evt_15027c77b0df
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_7121dc3a1 ...
dedupe_key signal_enriched:discovery_ipo_delta:e50483f186502c ...
throttle_s 0
created_at 2026-04-13T21:14:37.237524+00:00
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