Delete row sig_13badd20565b from signals

id sig_13badd20565b
event_id evt_5ff28aa5ab60
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T23:05:36.545097+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:ef1299a768f0b06a
throttle_s 0
created_at 2026-04-11T23:05:36.545097+00:00
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