Delete row sig_458a78b0d830 from signals

id sig_458a78b0d830
event_id evt_b48a4ebe5767
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T06:53:53.956154+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:219940e55815cc97
throttle_s 0
created_at 2026-04-07T06:53:53.956154+00:00
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