Delete row sig_2132c9839dc1 from signals

id sig_2132c9839dc1
event_id evt_0e13ae38f1c5
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_18480c3c6 ...
dedupe_key signal_enriched:discovery_ipo_delta:3a0f43b34ffdce ...
throttle_s 0
created_at 2026-04-10T13:12:08.706840+00:00
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