Delete row sig_ecffdaa850bc from signals

id sig_ecffdaa850bc
event_id evt_8a18667dd17c
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-03T17:57:16.093355+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d7bccd8e5d1fd73f
throttle_s 0
created_at 2026-04-03T17:57:16.093355+00:00
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