Delete row sig_abb4a2066be1 from signals

id sig_abb4a2066be1
event_id evt_b08d5832f341
watcher_id NULL
signal_type discovery_new_listings_delta
value {"aggregator_url":"https://www.nasdaq. ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_2eda015f5 ...
dedupe_key signal_enriched:discovery_new_listings_delta:12124 ...
throttle_s 0
created_at 2026-04-10T18:51:17.968267+00:00
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