Delete row sig_44dc4d10566f from signals

id sig_44dc4d10566f
event_id evt_ca4ca149afd9
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_613ce5600 ...
dedupe_key signal_enriched:discovery_ipo_delta:68a394a0f5ddf5 ...
throttle_s 0
created_at 2026-04-12T05:42:08.708244+00:00
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