Delete row sig_17701328a4a8 from signals

id sig_17701328a4a8
event_id evt_b217260e79c6
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_1041884a2 ...
dedupe_key signal_enriched:discovery_ipo_delta:18025e7b7d777c ...
throttle_s 0
created_at 2026-04-20T15:42:12.815098+00:00
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