Delete row sig_53810841b918 from signals

id sig_53810841b918
event_id evt_ec46287b25f2
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_f1b0c0486 ...
dedupe_key signal_enriched:news_delta:0d343f0b972e0a24
throttle_s 0
created_at 2026-04-20T20:05:38.931558+00:00
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