Delete row sig_274946bc86a6 from signals

id sig_274946bc86a6
event_id evt_fc6d7c9707ef
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T02:26:07.420730+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:0be0e067b6ef9584
throttle_s 0
created_at 2026-04-11T02:26:07.420730+00:00
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