Delete row sig_ff8219daf97f from signals

id sig_ff8219daf97f
event_id evt_0b244d5a3108
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_b1e9829e1 ...
dedupe_key signal_enriched:discovery_ipo_delta:4e5e8ff8d6ff55 ...
throttle_s 0
created_at 2026-04-20T07:05:40.083399+00:00
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