Delete row sig_25d1602af596 from signals

id sig_25d1602af596
event_id evt_14c8227670c7
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T02:13:19.475905+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:9215d21011ecbbd2
throttle_s 0
created_at 2026-04-13T02:13:19.475905+00:00
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