Delete row sig_a230ec7a9a5b from signals

id sig_a230ec7a9a5b
event_id evt_687bc7f792c2
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_b4649cfa2 ...
dedupe_key signal_enriched:discovery_ipo_delta:f95d600c9b1b14 ...
throttle_s 0
created_at 2026-04-10T14:13:04.518445+00:00
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