Delete row sig_ab6689b4670f from signals

id sig_ab6689b4670f
event_id evt_d4f9d02dffce
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_0d19a0584 ...
dedupe_key signal_enriched:news_delta:2a6b0fd9a7ff08a5
throttle_s 0
created_at 2026-04-22T11:16:45.442065+00:00
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