Delete row sig_f75f5c6f53f1 from signals

id sig_f75f5c6f53f1
event_id evt_e3ddb0e26b2d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T18:47:12.937724+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:56d6bd805df0c13c
throttle_s 0
created_at 2026-04-07T18:47:12.937724+00:00
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