Delete row sig_27e684bb7969 from signals

id sig_27e684bb7969
event_id evt_eb7e0c613f9b
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-16T13:31:42.828297+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:deeb0769408e3d4a
throttle_s 0
created_at 2026-04-16T13:31:42.828297+00:00
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