Delete row sig_21faba1946e8 from signals

id sig_21faba1946e8
event_id evt_c47cef974abb
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_df9ea9f87 ...
dedupe_key signal_enriched:news_delta:652f5a7fb45a70bd
throttle_s 0
created_at 2026-04-20T00:17:33.001211+00:00
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