Delete row sig_8888f37a8ae6 from signals

id sig_8888f37a8ae6
event_id evt_2f84d9906cb2
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-22T07:37:02.703692+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:bd2defa1d694cf9d
throttle_s 0
created_at 2026-04-22T07:37:02.703692+00:00
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