Delete row sig_f138dff3e97d from signals

id sig_f138dff3e97d
event_id evt_b67a6a321128
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_0ebb4b84b ...
dedupe_key signal_enriched:discovery_ipo_delta:77e06024205f31 ...
throttle_s 0
created_at 2026-04-14T11:11:53.825742+00:00
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