Delete row sig_a1759bbc10b1 from signals

id sig_a1759bbc10b1
event_id evt_efb9ba70fd81
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_582263441 ...
dedupe_key signal_enriched:discovery_ipo_delta:5c94c0ea52586c ...
throttle_s 0
created_at 2026-04-11T09:08:15.689426+00:00
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