Delete row sig_9acb26847572 from signals

id sig_9acb26847572
event_id evt_b8894d66ea82
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T13:30:28.612543+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:3f6e4611117af95a
throttle_s 0
created_at 2026-04-09T13:30:28.612543+00:00
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