Delete row sig_890e795402dc from signals

id sig_890e795402dc
event_id evt_faba19981032
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_c36cf375e ...
dedupe_key signal_enriched:discovery_ipo_delta:b9006ab2c9abfe ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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