Delete row sig_df30d849fecc from signals

id sig_df30d849fecc
event_id evt_303b32d03fc8
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_d699b46fb ...
dedupe_key signal_enriched:news_delta:dfc44d5fd236860c
throttle_s 0
created_at 2026-04-13T13:18:39.896124+00:00
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