Delete row sig_f7ec6433d45f from signals

id sig_f7ec6433d45f
event_id evt_8b2604b41c16
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_b394524e9 ...
dedupe_key signal_enriched:discovery_ipo_delta:48062219554a70 ...
throttle_s 0
created_at 2026-04-10T15:51:15.884890+00:00
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