Delete row sig_941eded876df from signals

id sig_941eded876df
event_id evt_0599848b60ce
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_a2fc4e5fd ...
dedupe_key signal_enriched:news_delta:2d35d2cee2c3843f
throttle_s 0
created_at 2026-04-17T17:17:12.350333+00:00
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