Delete row sig_283e29bd75fb from signals

id sig_283e29bd75fb
event_id evt_f573634cc286
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_ffa04d0db ...
dedupe_key signal_enriched:news_delta:ad8db2101f976b5c
throttle_s 0
created_at 2026-04-18T09:31:39.115291+00:00
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