Delete row sig_a2f161697150 from signals

id sig_a2f161697150
event_id evt_53f33ef3b66b
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_0cf0cea91 ...
dedupe_key signal_enriched:discovery_ipo_delta:ce5c491401a973 ...
throttle_s 0
created_at 2026-04-17T03:42:58.209772+00:00
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