Delete row sig_1583592577e6 from signals

id sig_1583592577e6
event_id evt_69daa27bd692
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_c2f44cc94 ...
dedupe_key signal_enriched:news_delta:f1b96db101eaa88f
throttle_s 0
created_at 2026-04-20T03:04:57.335114+00:00
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