Delete row sig_597f415d7ef9 from signals

id sig_597f415d7ef9
event_id evt_b9c5fb2187a9
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-16T12:05:49.106093+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d46a9e88e5a13045
throttle_s 0
created_at 2026-04-16T12:05:49.106093+00:00
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