Delete row sig_173f6fe44223 from signals

id sig_173f6fe44223
event_id evt_d1b9cd170e44
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_a226e41bc ...
dedupe_key signal_enriched:discovery_ipo_delta:27f2faaa2de9a1 ...
throttle_s 0
created_at 2026-04-09T15:06:58.940339+00:00
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