Delete row sig_0b83c540d38c from signals

id sig_0b83c540d38c
event_id evt_2ec87fada92e
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T00:09:02.720707+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:294ebf94bfa4fabe
throttle_s 0
created_at 2026-04-10T00:09:02.720707+00:00
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