Delete row sig_13286533962e from signals

id sig_13286533962e
event_id evt_3b8bb03317d4
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T23:05:59.046352+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:7416b46465a01bd2
throttle_s 0
created_at 2026-04-09T23:05:59.046352+00:00
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