Delete row sig_1828b59c3c7f from signals

id sig_1828b59c3c7f
event_id evt_71e7a0998df2
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_e0af14a51 ...
dedupe_key signal_enriched:discovery_new_listings_delta:337c7 ...
throttle_s 0
created_at 2026-04-10T09:08:57.869901+00:00
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