Delete row sig_d4ed07306530 from signals

id sig_d4ed07306530
event_id evt_10b8dbc7a964
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T16:18:35.766121+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:4a1edf0e0423cf51
throttle_s 0
created_at 2026-04-13T16:18:35.766121+00:00
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