Delete row sig_78a567544684 from signals

id sig_78a567544684
event_id evt_256372e0dba4
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_1cbf71268 ...
dedupe_key signal_enriched:discovery_new_listings_delta:8424d ...
throttle_s 0
created_at 2026-04-10T14:13:04.518445+00:00
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