Delete row sig_03a1049adb2e from signals

id sig_03a1049adb2e
event_id evt_e6844340f1e9
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_15a0c805d ...
dedupe_key signal_enriched:news_delta:dd1eb9eb29ba6f19
throttle_s 0
created_at 2026-04-19T19:30:21.171178+00:00
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