Delete row sig_8849ae78a1b0 from signals

id sig_8849ae78a1b0
event_id evt_1c20101fd947
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_09e9d83e4 ...
dedupe_key signal_enriched:discovery_ipo_delta:0e33594f62f77c ...
throttle_s 0
created_at 2026-04-17T14:13:05.509159+00:00
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