Delete row sig_a11f40577645 from signals

id sig_a11f40577645
event_id evt_0ec53dc7a214
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T02:21:31.455425+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:c8ef74d667458e7e
throttle_s 0
created_at 2026-04-21T02:21:31.455425+00:00
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