Delete row sig_17a017612426 from signals

id sig_17a017612426
event_id evt_f9145108fb70
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_585c03896 ...
dedupe_key signal_enriched:discovery_ipo_delta:439ecf069a260c ...
throttle_s 0
created_at 2026-04-22T13:12:40.941923+00:00
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