Delete row sig_1fa5b4c612b0 from signals

id sig_1fa5b4c612b0
event_id evt_1ffec2bdaed5
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_05f305cc0 ...
dedupe_key signal_enriched:news_delta:85a0401dbf2e3eb7
throttle_s 0
created_at 2026-04-08T23:28:56.442816+00:00
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