Delete row sig_b588e48f031a from signals

id sig_b588e48f031a
event_id evt_27dea777c477
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T13:27:17.124438+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d1f2fcf5812f6568
throttle_s 0
created_at 2026-04-17T13:27:17.124438+00:00
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