Delete row sig_7425500256c9 from signals

id sig_7425500256c9
event_id evt_fb1acc8d9872
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-08T07:06:33.071555+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:4b478b181940eba6
throttle_s 0
created_at 2026-04-08T07:06:33.071555+00:00
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