Delete row sig_1fb56f098612 from signals

id sig_1fb56f098612
event_id evt_e4b31dabf984
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_58a5c48e6 ...
dedupe_key signal_enriched:news_delta:2d812bf170324082
throttle_s 0
created_at 2026-04-09T18:49:36.329137+00:00
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