Delete row sig_ffb37aed0208 from signals

id sig_ffb37aed0208
event_id evt_b02651dce9b9
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_aad76b778 ...
dedupe_key signal_enriched:discovery_ipo_delta:fedc8b4afcdf5a ...
throttle_s 0
created_at 2026-04-19T22:59:40.647246+00:00
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