Delete row sig_a03636956a9c from signals

id sig_a03636956a9c
event_id evt_bdcb7a19c98a
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_c1bf782ac ...
dedupe_key signal_enriched:news_delta:50672e39860a600c
throttle_s 0
created_at 2026-04-16T07:54:21.914001+00:00
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