Delete row sig_1d4abe5bd697 from signals

id sig_1d4abe5bd697
event_id evt_e6a11950eb61
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_d8f09b737 ...
dedupe_key signal_enriched:news_delta:aa0448d59cfd0633
throttle_s 0
created_at 2026-04-20T22:09:14.780276+00:00
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