Delete row sig_5640c1625ba1 from signals

id sig_5640c1625ba1
event_id evt_498559d963b2
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T17:15:00.273179+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:110394434a1f00e6
throttle_s 0
created_at 2026-04-10T17:15:00.273179+00:00
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