Delete row sig_c93779a1b8dc from signals

id sig_c93779a1b8dc
event_id evt_0abdaf43de59
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_3ea275cc9 ...
dedupe_key signal_enriched:news_delta:400efdf9f3e45dbb
throttle_s 0
created_at 2026-04-19T12:01:22.838905+00:00
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