Delete row sig_45446470dffc from signals

id sig_45446470dffc
event_id evt_4cf74687be5d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-03T16:26:07.839980+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:aace7367e58e97ed
throttle_s 0
created_at 2026-04-03T16:26:07.839980+00:00
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