Delete row sig_0503ee1e6fb2 from signals

id sig_0503ee1e6fb2
event_id evt_2aff947f118a
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_cd729f204 ...
dedupe_key signal_enriched:discovery_ipo_delta:31dffd15dd5e43 ...
throttle_s 0
created_at 2026-04-10T06:07:12.383671+00:00
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