Delete row sig_e75c28920c3f from signals

id sig_e75c28920c3f
event_id evt_c228717f3e46
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_437c8bfb5 ...
dedupe_key signal_enriched:discovery_ipo_delta:eafab362d7c7f7 ...
throttle_s 0
created_at 2026-04-12T09:44:26.186435+00:00
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