Delete row sig_ff1a30387451 from signals

id sig_ff1a30387451
event_id evt_c3a125b57f4a
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_5ff3cba82 ...
dedupe_key signal_enriched:news_delta:acf500dfa225e08d
throttle_s 0
created_at 2026-04-10T15:03:23.265424+00:00
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